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-rw-r--r--database/README.md206
-rw-r--r--database/engine/README.md186
-rw-r--r--database/engine/pagecache.c36
-rw-r--r--database/engine/pagecache.h38
-rw-r--r--database/engine/rrdengine.c69
-rw-r--r--database/engine/rrdengineapi.c42
-rw-r--r--database/engine/rrdengineapi.h2
-rw-r--r--database/engine/rrdenginelib.c4
-rw-r--r--database/rrd.c4
-rw-r--r--database/rrd.h3
-rw-r--r--database/rrdcalc.c215
-rw-r--r--database/rrdcalc.h11
-rw-r--r--database/rrdcalctemplate.c36
-rw-r--r--database/rrdcalctemplate.h8
-rw-r--r--database/rrddim.c52
-rw-r--r--database/rrdhost.c14
-rw-r--r--database/rrdset.c2
17 files changed, 613 insertions, 315 deletions
diff --git a/database/README.md b/database/README.md
index 2fcb69b67..143615a0e 100644
--- a/database/README.md
+++ b/database/README.md
@@ -1,59 +1,54 @@
# Database
-Although `netdata` does all its calculations using `long double`, it stores all values using
-a [custom-made 32-bit number](../libnetdata/storage_number/).
+Although `netdata` does all its calculations using `long double`, it stores all values using a [custom-made 32-bit
+number](../libnetdata/storage_number/).
-So, for each dimension of a chart, Netdata will need: `4 bytes for the value * the entries
-of its history`. It will not store any other data for each value in the time series database.
-Since all its values are stored in a time series with fixed step, the time each value
-corresponds can be calculated at run time, using the position of a value in the round robin database.
+So, for each dimension of a chart, Netdata will need: `4 bytes for the value * the entries of its history`. It will not
+store any other data for each value in the time series database. Since all its values are stored in a time series with
+fixed step, the time each value corresponds can be calculated at run time, using the position of a value in the round
+robin database.
-The default history is 3.600 entries, thus it will need 14.4KB for each chart dimension.
-If you need 1.000 dimensions, they will occupy just 14.4MB.
+The default history is 3.600 entries, thus it will need 14.4KB for each chart dimension. If you need 1.000 dimensions,
+they will occupy just 14.4MB.
-Of course, 3.600 entries is a very short history, especially if data collection frequency is set
-to 1 second. You will have just one hour of data.
+Of course, 3.600 entries is a very short history, especially if data collection frequency is set to 1 second. You will
+have just one hour of data.
-For a day of data and 1.000 dimensions, you will need: 86.400 seconds * 4 bytes * 1.000
-dimensions = 345MB of RAM.
+For a day of data and 1.000 dimensions, you will need: `86.400 seconds * 4 bytes * 1.000 dimensions = 345MB of RAM`.
-One option you have to lower this number is to use
-**[Memory Deduplication - Kernel Same Page Merging - KSM](#ksm)**. Another possibility is to
-use the **[Database Engine](engine/)**.
+One option you have to lower this number is to use **[Memory Deduplication - Kernel Same Page Merging - KSM](#ksm)**.
+Another possibility is to use the **[Database Engine](engine/)**.
## Memory modes
Currently Netdata supports 6 memory modes:
-1. `ram`, data are purely in memory. Data are never saved on disk. This mode uses `mmap()` and
- supports [KSM](#ksm).
+1. `ram`, data are purely in memory. Data are never saved on disk. This mode uses `mmap()` and supports [KSM](#ksm).
-2. `save`, (the default) data are only in RAM while Netdata runs and are saved to / loaded from
- disk on Netdata restart. It also uses `mmap()` and supports [KSM](#ksm).
+2. `save`, data are only in RAM while Netdata runs and are saved to / loaded from disk on Netdata
+ restart. It also uses `mmap()` and supports [KSM](#ksm).
-3. `map`, data are in memory mapped files. This works like the swap. Keep in mind though, this
- will have a constant write on your disk. When Netdata writes data on its memory, the Linux kernel
- marks the related memory pages as dirty and automatically starts updating them on disk.
- Unfortunately we cannot control how frequently this works. The Linux kernel uses exactly the
- same algorithm it uses for its swap memory. Check below for additional information on running a
- dedicated central Netdata server. This mode uses `mmap()` but does not support [KSM](#ksm).
+3. `map`, data are in memory mapped files. This works like the swap. Keep in mind though, this will have a constant
+ write on your disk. When Netdata writes data on its memory, the Linux kernel marks the related memory pages as dirty
+ and automatically starts updating them on disk. Unfortunately we cannot control how frequently this works. The Linux
+ kernel uses exactly the same algorithm it uses for its swap memory. Check below for additional information on
+ running a dedicated central Netdata server. This mode uses `mmap()` but does not support [KSM](#ksm).
4. `none`, without a database (collected metrics can only be streamed to another Netdata).
-5. `alloc`, like `ram` but it uses `calloc()` and does not support [KSM](#ksm). This mode is the
- fallback for all others except `none`.
+5. `alloc`, like `ram` but it uses `calloc()` and does not support [KSM](#ksm). This mode is the fallback for all
+ others except `none`.
-6. `dbengine`, data are in database files. The [Database Engine](engine/) works like a traditional
- database. There is some amount of RAM dedicated to data caching and indexing and the rest of
- the data reside compressed on disk. The number of history entries is not fixed in this case,
- but depends on the configured disk space and the effective compression ratio of the data stored.
- This is the **only mode** that supports changing the data collection update frequency
- (`update_every`) **without losing** the previously stored metrics.
- For more details see [here](engine/).
+6. `dbengine`, (the default) data are in database files. The [Database Engine](engine/) works like a traditional
+ database. There is some amount of RAM dedicated to data caching and indexing and the rest of the data reside
+ compressed on disk. The number of history entries is not fixed in this case, but depends on the configured disk
+ space and the effective compression ratio of the data stored. This is the **only mode** that supports changing the
+ data collection update frequency (`update_every`) **without losing** the previously stored metrics. For more details
+ see [here](engine/).
You can select the memory mode by editing `netdata.conf` and setting:
-```
+```conf
[global]
# ram, save (the default, save on exit, load on start), map (swap like)
memory mode = save
@@ -69,64 +64,60 @@ Embedded devices usually have very limited RAM resources available.
There are 2 settings for you to tweak:
1. `update every`, which controls the data collection frequency
-2. `history`, which controls the size of the database in RAM
+2. `history`, which controls the size of the database in RAM (except for `memory mode = dbengine`)
-By default `update every = 1` and `history = 3600`. This gives you an hour of data with per
-second updates.
+By default `update every = 1` and `history = 3600`. This gives you an hour of data with per second updates.
-If you set `update every = 2` and `history = 1800`, you will still have an hour of data, but
-collected once every 2 seconds. This will **cut in half** both CPU and RAM resources consumed
-by Netdata. Of course experiment a bit. On very weak devices you might have to use
-`update every = 5` and `history = 720` (still 1 hour of data, but 1/5 of the CPU and RAM resources).
+If you set `update every = 2` and `history = 1800`, you will still have an hour of data, but collected once every 2
+seconds. This will **cut in half** both CPU and RAM resources consumed by Netdata. Of course experiment a bit. On very
+weak devices you might have to use `update every = 5` and `history = 720` (still 1 hour of data, but 1/5 of the CPU and
+RAM resources).
-You can also disable [data collection plugins](../collectors) you don't need.
-Disabling such plugins will also free both CPU and RAM resources.
+You can also disable [data collection plugins](../collectors) you don't need. Disabling such plugins will also free both
+CPU and RAM resources.
## Running a dedicated central Netdata server
-Netdata allows streaming data between Netdata nodes. This allows us to have a central Netdata
-server that will maintain the entire database for all nodes, and will also run health checks/alarms
-for all nodes.
+Netdata allows streaming data between Netdata nodes. This allows us to have a central Netdata server that will maintain
+the entire database for all nodes, and will also run health checks/alarms for all nodes.
-For this central Netdata, memory size can be a problem. Fortunately, Netdata supports several
-memory modes. **One interesting option** for this setup is `memory mode = map`.
+For this central Netdata, memory size can be a problem. Fortunately, Netdata supports several memory modes. **One
+interesting option** for this setup is `memory mode = map`.
### map
-In this mode, the database of Netdata is stored in memory mapped files. Netdata continues to read
-and write the database in memory, but the kernel automatically loads and saves memory pages from/to
-disk.
+In this mode, the database of Netdata is stored in memory mapped files. Netdata continues to read and write the database
+in memory, but the kernel automatically loads and saves memory pages from/to disk.
-**We suggest _not_ to use this mode on nodes that run other applications.** There will always be
-dirty memory to be synced and this syncing process may influence the way other applications work.
-This mode however is useful when we need a central Netdata server that would normally need huge
-amounts of memory. Using memory mode `map` we can overcome all memory restrictions.
+**We suggest _not_ to use this mode on nodes that run other applications.** There will always be dirty memory to be
+synced and this syncing process may influence the way other applications work. This mode however is useful when we need
+a central Netdata server that would normally need huge amounts of memory. Using memory mode `map` we can overcome all
+memory restrictions.
-There are a few kernel options that provide finer control on the way this syncing works. But before
-explaining them, a brief introduction of how Netdata database works is needed.
+There are a few kernel options that provide finer control on the way this syncing works. But before explaining them, a
+brief introduction of how Netdata database works is needed.
For each chart, Netdata maps the following files:
-1. `chart/main.db`, this is the file that maintains chart information. Every time data are collected
- for a chart, this is updated.
-2. `chart/dimension_name.db`, this is the file for each dimension. At its beginning there is a
- header, followed by the round robin database where metrics are stored.
+1. `chart/main.db`, this is the file that maintains chart information. Every time data are collected for a chart, this
+ is updated.
+2. `chart/dimension_name.db`, this is the file for each dimension. At its beginning there is a header, followed by the
+ round robin database where metrics are stored.
So, every time Netdata collects data, the following pages will become dirty:
1. the chart file
2. the header part of all dimension files
-3. if the collected metrics are stored far enough in the dimension file, another page will
- become dirty, for each dimension
+3. if the collected metrics are stored far enough in the dimension file, another page will become dirty, for each
+ dimension
-Each page in Linux is 4KB. So, with 200 charts and 1000 dimensions, there will be 1200 to 2200 4KB
-pages dirty pages every second. Of course 1200 of them will always be dirty (the chart header and
-the dimensions headers) and 1000 will be dirty for about 1000 seconds (4 bytes per metric, 4KB per
-page, so 1000 seconds, or 16 minutes per page).
+Each page in Linux is 4KB. So, with 200 charts and 1000 dimensions, there will be 1200 to 2200 4KB pages dirty pages
+every second. Of course 1200 of them will always be dirty (the chart header and the dimensions headers) and 1000 will be
+dirty for about 1000 seconds (4 bytes per metric, 4KB per page, so 1000 seconds, or 16 minutes per page).
-Hopefully, the Linux kernel does not sync all these data every second. The frequency they are
-synced is controlled by `/proc/sys/vm/dirty_expire_centisecs` or the
-`sysctl` `vm.dirty_expire_centisecs`. The default on most systems is 3000 (30 seconds).
+Hopefully, the Linux kernel does not sync all these data every second. The frequency they are synced is controlled by
+`/proc/sys/vm/dirty_expire_centisecs` or the `sysctl` `vm.dirty_expire_centisecs`. The default on most systems is 3000
+(30 seconds).
On a busy server centralizing metrics from 20+ servers you will experience this:
@@ -134,62 +125,59 @@ On a busy server centralizing metrics from 20+ servers you will experience this:
As you can see, there is quite some stress (this is `iowait`) every 30 seconds.
-A simple solution is to increase this time to 10 minutes (60000). This is the same system
-with this setting in 10 minutes:
+A simple solution is to increase this time to 10 minutes (60000). This is the same system with this setting in 10
+minutes:
![image](https://cloud.githubusercontent.com/assets/2662304/23834784/d2304f72-0764-11e7-8389-fb830ffd973a.png)
-Of course, setting this to 10 minutes means that data on disk might be up to 10 minutes old if you
-get an abnormal shutdown.
+Of course, setting this to 10 minutes means that data on disk might be up to 10 minutes old if you get an abnormal
+shutdown.
There are 2 more options to tweak:
1. `dirty_background_ratio`, by default `10`.
2. `dirty_ratio`, by default `20`.
-These control the amount of memory that should be dirty for disk syncing to be triggered.
-On dedicated Netdata servers, you can use: `80` and `90` respectively, so that all RAM is given
-to Netdata.
+These control the amount of memory that should be dirty for disk syncing to be triggered. On dedicated Netdata servers,
+you can use: `80` and `90` respectively, so that all RAM is given to Netdata.
-With these settings, you can expect a little `iowait` spike once every 10 minutes and in case
-of system crash, data on disk will be up to 10 minutes old.
+With these settings, you can expect a little `iowait` spike once every 10 minutes and in case of system crash, data on
+disk will be up to 10 minutes old.
![image](https://cloud.githubusercontent.com/assets/2662304/23835030/ba4bf506-0768-11e7-9bc6-3b23e080c69f.png)
-To have these settings automatically applied on boot, create the file `/etc/sysctl.d/netdata-memory.conf` with these contents:
+To have these settings automatically applied on boot, create the file `/etc/sysctl.d/netdata-memory.conf` with these
+contents:
-```
+```conf
vm.dirty_expire_centisecs = 60000
vm.dirty_background_ratio = 80
vm.dirty_ratio = 90
vm.dirty_writeback_centisecs = 0
```
-There is another memory mode to help overcome the memory size problem. What is **most interesting
-for this setup** is `memory mode = dbengine`.
+There is another memory mode to help overcome the memory size problem. What is **most interesting for this setup** is
+`memory mode = dbengine`.
### dbengine
-In this mode, the database of Netdata is stored in database files. The [Database Engine](engine/)
-works like a traditional database. There is some amount of RAM dedicated to data caching and
-indexing and the rest of the data reside compressed on disk. The number of history entries is not
-fixed in this case, but depends on the configured disk space and the effective compression ratio
-of the data stored.
+In this mode, the database of Netdata is stored in database files. The [Database Engine](engine/) works like a
+traditional database. There is some amount of RAM dedicated to data caching and indexing and the rest of the data reside
+compressed on disk. The number of history entries is not fixed in this case, but depends on the configured disk space
+and the effective compression ratio of the data stored.
-We suggest to use **this** mode on nodes that also run other applications. The Database Engine uses
-direct I/O to avoid polluting the OS filesystem caches and does not generate excessive I/O traffic
-so as to create the minimum possible interference with other applications. Using memory mode
-`dbengine` we can overcome most memory restrictions. For more details see [here](engine/).
+We suggest to use **this** mode on nodes that also run other applications. The Database Engine uses direct I/O to avoid
+polluting the OS filesystem caches and does not generate excessive I/O traffic so as to create the minimum possible
+interference with other applications. Using memory mode `dbengine` we can overcome most memory restrictions. For more
+details see [here](engine/).
## KSM
-Netdata offers all its round robin database to kernel for deduplication
-(except for `memory mode = dbengine`).
+Netdata offers all its round robin database to kernel for deduplication (except for `memory mode = dbengine`).
-In the past KSM has been criticized for consuming a lot of CPU resources.
-Although this is true when KSM is used for deduplicating certain applications, it is not true with
-netdata, since the Netdata memory is written very infrequently (if you have 24 hours of metrics in
-netdata, each byte at the in-memory database will be updated just once per day).
+In the past KSM has been criticized for consuming a lot of CPU resources. Although this is true when KSM is used for
+deduplicating certain applications, it is not true with netdata, since the Netdata memory is written very infrequently
+(if you have 24 hours of metrics in netdata, each byte at the in-memory database will be updated just once per day).
KSM is a solution that will provide 60+% memory savings to Netdata.
@@ -203,15 +191,20 @@ CONFIG_KSM=y
When KSM is enabled at the kernel is just available for the user to enable it.
-So, if you build a kernel with `CONFIG_KSM=y` you will just get a few files in `/sys/kernel/mm/ksm`. Nothing else happens. There is no performance penalty (apart I guess from the memory this code occupies into the kernel).
+So, if you build a kernel with `CONFIG_KSM=y` you will just get a few files in `/sys/kernel/mm/ksm`. Nothing else
+happens. There is no performance penalty (apart I guess from the memory this code occupies into the kernel).
The files that `CONFIG_KSM=y` offers include:
-- `/sys/kernel/mm/ksm/run` by default `0`. You have to set this to `1` for the kernel to spawn `ksmd`.
-- `/sys/kernel/mm/ksm/sleep_millisecs`, by default `20`. The frequency ksmd should evaluate memory for deduplication.
-- `/sys/kernel/mm/ksm/pages_to_scan`, by default `100`. The amount of pages ksmd will evaluate on each run.
+- `/sys/kernel/mm/ksm/run` by default `0`. You have to set this to `1` for the
+ kernel to spawn `ksmd`.
+- `/sys/kernel/mm/ksm/sleep_millisecs`, by default `20`. The frequency ksmd
+ should evaluate memory for deduplication.
+- `/sys/kernel/mm/ksm/pages_to_scan`, by default `100`. The amount of pages
+ ksmd will evaluate on each run.
-So, by default `ksmd` is just disabled. It will not harm performance and the user/admin can control the CPU resources he/she is willing `ksmd` to use.
+So, by default `ksmd` is just disabled. It will not harm performance and the user/admin can control the CPU resources
+he/she is willing `ksmd` to use.
### Run `ksmd` kernel daemon
@@ -222,7 +215,8 @@ echo 1 >/sys/kernel/mm/ksm/run
echo 1000 >/sys/kernel/mm/ksm/sleep_millisecs
```
-With these settings ksmd does not even appear in the running process list (it will run once per second and evaluate 100 pages for de-duplication).
+With these settings ksmd does not even appear in the running process list (it will run once per second and evaluate 100
+pages for de-duplication).
Put the above lines in your boot sequence (`/etc/rc.local` or equivalent) to have `ksmd` run at boot.
@@ -232,4 +226,4 @@ Netdata will create charts for kernel memory de-duplication performance, like th
![image](https://cloud.githubusercontent.com/assets/2662304/11998786/eb23ae54-aab6-11e5-94d4-e848e8a5c56a.png)
-[![analytics](https://www.google-analytics.com/collect?v=1&aip=1&t=pageview&_s=1&ds=github&dr=https%3A%2F%2Fgithub.com%2Fnetdata%2Fnetdata&dl=https%3A%2F%2Fmy-netdata.io%2Fgithub%2Fdatabase%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)](<>)
+[![analytics](https://www.google-analytics.com/collect?v=1&aip=1&t=pageview&_s=1&ds=github&dr=https%3A%2F%2Fgithub.com%2Fnetdata%2Fnetdata&dl=https%3A%2F%2Fmy-netdata.io%2Fgithub%2Fdatabase%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)](<>) \ No newline at end of file
diff --git a/database/engine/README.md b/database/engine/README.md
index 7791a549f..78f3b15ec 100644
--- a/database/engine/README.md
+++ b/database/engine/README.md
@@ -1,18 +1,17 @@
# Database engine
-The Database Engine works like a traditional
-database. There is some amount of RAM dedicated to data caching and indexing and the rest of
-the data reside compressed on disk. The number of history entries is not fixed in this case,
-but depends on the configured disk space and the effective compression ratio of the data stored.
-This is the **only mode** that supports changing the data collection update frequency
-(`update_every`) **without losing** the previously stored metrics.
+The Database Engine works like a traditional database. There is some amount of RAM dedicated to data caching and
+indexing and the rest of the data reside compressed on disk. The number of history entries is not fixed in this case,
+but depends on the configured disk space and the effective compression ratio of the data stored. This is the **only
+mode** that supports changing the data collection update frequency (`update_every`) **without losing** the previously
+stored metrics.
## Files
-With the DB engine memory mode the metric data are stored in database files. These files are
-organized in pairs, the datafiles and their corresponding journalfiles, e.g.:
+With the DB engine memory mode the metric data are stored in database files. These files are organized in pairs, the
+datafiles and their corresponding journalfiles, e.g.:
-```
+```sh
datafile-1-0000000001.ndf
journalfile-1-0000000001.njf
datafile-1-0000000002.ndf
@@ -22,21 +21,19 @@ journalfile-1-0000000003.njf
...
```
-They are located under their host's cache directory in the directory `./dbengine`
-(e.g. for localhost the default location is `/var/cache/netdata/dbengine/*`). The higher
-numbered filenames contain more recent metric data. The user can safely delete some pairs
-of files when Netdata is stopped to manually free up some space.
+They are located under their host's cache directory in the directory `./dbengine` (e.g. for localhost the default
+location is `/var/cache/netdata/dbengine/*`). The higher numbered filenames contain more recent metric data. The user
+can safely delete some pairs of files when Netdata is stopped to manually free up some space.
_Users should_ **back up** _their `./dbengine` folders if they consider this data to be important._
## Configuration
-There is one DB engine instance per Netdata host/node. That is, there is one `./dbengine` folder
-per node, and all charts of `dbengine` memory mode in such a host share the same storage space
-and DB engine instance memory state. You can select the memory mode for localhost by editing
-netdata.conf and setting:
+There is one DB engine instance per Netdata host/node. That is, there is one `./dbengine` folder per node, and all
+charts of `dbengine` memory mode in such a host share the same storage space and DB engine instance memory state. You
+can select the memory mode for localhost by editing netdata.conf and setting:
-```
+```conf
[global]
memory mode = dbengine
```
@@ -44,110 +41,157 @@ netdata.conf and setting:
For setting the memory mode for the rest of the nodes you should look at
[streaming](../../streaming/).
-The `history` configuration option is meaningless for `memory mode = dbengine` and is ignored
-for any metrics being stored in the DB engine.
+The `history` configuration option is meaningless for `memory mode = dbengine` and is ignored for any metrics being
+stored in the DB engine.
-All DB engine instances, for localhost and all other streaming recipient nodes inherit their
-configuration from `netdata.conf`:
+All DB engine instances, for localhost and all other streaming recipient nodes inherit their configuration from
+`netdata.conf`:
-```
+```conf
[global]
page cache size = 32
dbengine disk space = 256
```
-The above values are the default and minimum values for Page Cache size and DB engine disk space
-quota. Both numbers are in **MiB**. All DB engine instances will allocate the configured resources
-separately.
+The above values are the default and minimum values for Page Cache size and DB engine disk space quota. Both numbers are
+in **MiB**. All DB engine instances will allocate the configured resources separately.
-The `page cache size` option determines the amount of RAM in **MiB** that is dedicated to caching
-Netdata metric values themselves.
+The `page cache size` option determines the amount of RAM in **MiB** that is dedicated to caching Netdata metric values
+themselves as far as queries are concerned. The total page cache size will be greater since data collection itself will
+consume additional memory as is described in the [Memory requirements](#memory-requirements) section.
-The `dbengine disk space` option determines the amount of disk space in **MiB** that is dedicated
-to storing Netdata metric values and all related metadata describing them.
+The `dbengine disk space` option determines the amount of disk space in **MiB** that is dedicated to storing Netdata
+metric values and all related metadata describing them.
## Operation
-The DB engine stores chart metric values in 4096-byte pages in memory. Each chart dimension gets
-its own page to store consecutive values generated from the data collectors. Those pages comprise
-the **Page Cache**.
+The DB engine stores chart metric values in 4096-byte pages in memory. Each chart dimension gets its own page to store
+consecutive values generated from the data collectors. Those pages comprise the **Page Cache**.
-When those pages fill up they are slowly compressed and flushed to disk.
-It can take `4096 / 4 = 1024 seconds = 17 minutes`, for a chart dimension that is being collected
-every 1 second, to fill a page. Pages can be cut short when we stop Netdata or the DB engine
-instance so as to not lose the data. When we query the DB engine for data we trigger disk read
-I/O requests that fill the Page Cache with the requested pages and potentially evict cold
-(not recently used) pages.
+When those pages fill up they are slowly compressed and flushed to disk. It can take `4096 / 4 = 1024 seconds = 17
+minutes`, for a chart dimension that is being collected every 1 second, to fill a page. Pages can be cut short when we
+stop Netdata or the DB engine instance so as to not lose the data. When we query the DB engine for data we trigger disk
+read I/O requests that fill the Page Cache with the requested pages and potentially evict cold (not recently used)
+pages.
-When the disk quota is exceeded the oldest values are removed from the DB engine at real time, by
-automatically deleting the oldest datafile and journalfile pair. Any corresponding pages residing
-in the Page Cache will also be invalidated and removed. The DB engine logic will try to maintain
-between 10 and 20 file pairs at any point in time.
+When the disk quota is exceeded the oldest values are removed from the DB engine at real time, by automatically deleting
+the oldest datafile and journalfile pair. Any corresponding pages residing in the Page Cache will also be invalidated
+and removed. The DB engine logic will try to maintain between 10 and 20 file pairs at any point in time.
-The Database Engine uses direct I/O to avoid polluting the OS filesystem caches and does not
-generate excessive I/O traffic so as to create the minimum possible interference with other
-applications.
+The Database Engine uses direct I/O to avoid polluting the OS filesystem caches and does not generate excessive I/O
+traffic so as to create the minimum possible interference with other applications.
## Memory requirements
-Using memory mode `dbengine` we can overcome most memory restrictions and store a dataset that
-is much larger than the available memory.
+Using memory mode `dbengine` we can overcome most memory restrictions and store a dataset that is much larger than the
+available memory.
-There are explicit memory requirements **per** DB engine **instance**, meaning **per** Netdata
-**node** (e.g. localhost and streaming recipient nodes):
+There are explicit memory requirements **per** DB engine **instance**, meaning **per** Netdata **node** (e.g. localhost
+and streaming recipient nodes):
-- `page cache size` must be at least `#dimensions-being-collected x 4096 x 2` bytes.
+- The total page cache memory footprint will be an additional `#dimensions-being-collected x 4096 x 2` bytes over what
+ the user configured with `page cache size`.
- an additional `#pages-on-disk x 4096 x 0.03` bytes of RAM are allocated for metadata.
- roughly speaking this is 3% of the uncompressed disk space taken by the DB files.
- - for very highly compressible data (compression ratio > 90%) this RAM overhead
- is comparable to the disk space footprint.
+ - for very highly compressible data (compression ratio > 90%) this RAM overhead is comparable to the disk space
+ footprint.
-An important observation is that RAM usage depends on both the `page cache size` and the
-`dbengine disk space` options.
+An important observation is that RAM usage depends on both the `page cache size` and the `dbengine disk space` options.
## File descriptor requirements
-The Database Engine may keep a **significant** amount of files open per instance (e.g. per streaming
-slave or master server). When configuring your system you should make sure there are at least 50
-file descriptors available per `dbengine` instance.
+The Database Engine may keep a **significant** amount of files open per instance (e.g. per streaming slave or master
+server). When configuring your system you should make sure there are at least 50 file descriptors available per
+`dbengine` instance.
-Netdata allocates 25% of the available file descriptors to its Database Engine instances. This means that only 25%
-of the file descriptors that are available to the Netdata service are accessible by dbengine instances.
-You should take that into account when configuring your service
-or system-wide file descriptor limits. You can roughly estimate that the Netdata service needs 2048 file
-descriptors for every 10 streaming slave hosts when streaming is configured to use `memory mode = dbengine`.
+Netdata allocates 25% of the available file descriptors to its Database Engine instances. This means that only 25% of
+the file descriptors that are available to the Netdata service are accessible by dbengine instances. You should take
+that into account when configuring your service or system-wide file descriptor limits. You can roughly estimate that the
+Netdata service needs 2048 file descriptors for every 10 streaming slave hosts when streaming is configured to use
+`memory mode = dbengine`.
-If for example one wants to allocate 65536 file descriptors to the Netdata service on a systemd system
-one needs to override the Netdata service by running `sudo systemctl edit netdata` and creating a
-file with contents:
+If for example one wants to allocate 65536 file descriptors to the Netdata service on a systemd system one needs to
+override the Netdata service by running `sudo systemctl edit netdata` and creating a file with contents:
-```
+```sh
[Service]
LimitNOFILE=65536
```
For other types of services one can add the line:
-```
+```sh
ulimit -n 65536
```
-at the beginning of the service file. Alternatively you can change the system-wide limits of the kernel by changing `/etc/sysctl.conf`. For linux that would be:
+at the beginning of the service file. Alternatively you can change the system-wide limits of the kernel by changing
+ `/etc/sysctl.conf`. For linux that would be:
-```
+```conf
fs.file-max = 65536
```
In FreeBSD and OS X you change the lines like this:
-```
+```conf
kern.maxfilesperproc=65536
kern.maxfiles=65536
```
You can apply the settings by running `sysctl -p` or by rebooting.
+## Evaluation
+
+We have evaluated the performance of the `dbengine` API that the netdata daemon uses internally. This is **not** the
+web API of netdata. Our benchmarks ran on a **single** `dbengine` instance, multiple of which can be running in a
+netdata master server. We used a server with an AMD Ryzen Threadripper 2950X 16-Core Processor and 2 disk drives, a
+Seagate Constellation ES.3 2TB magnetic HDD and a SAMSUNG MZQLB960HAJR-00007 960GB NAND Flash SSD.
+
+For our workload, we defined 32 charts with 128 metrics each, giving us a total of 4096 metrics. We defined 1 worker
+thread per chart (32 threads) that generates new data points with a data generation interval of 1 second. The time axis
+of the time-series is emulated and accelerated so that the worker threads can generate as many data points as possible
+without delays.
+
+We also defined 32 worker threads that perform queries on random metrics with semi-random time ranges. The
+starting time of the query is randomly selected between the beginning of the time-series and the time of the latest data
+point. The ending time is randomly selected between 1 second and 1 hour after the starting time. The pseudo-random
+numbers are generated with a uniform distribution.
+
+The data are written to the database at the same time as they are read from it. This is a concurrent read/write mixed
+workload with a duration of 60 seconds. The faster `dbengine` runs, the bigger the dataset size becomes since more
+data points will be generated. We set a page cache size of 64MiB for the two disk-bound scenarios. This way, the dataset
+size of the metric data is much bigger than the RAM that is being used for caching so as to trigger I/O requests most
+of the time. In our final scenario, we set the page cache size to 16 GiB. That way, the dataset fits in the page cache
+so as to avoid all disk bottlenecks.
+
+The reported numbers are the following:
+
+| device | page cache | dataset | reads/sec | writes/sec |
+| :---: | :---: | ---: | ---: | ---: |
+| HDD | 64 MiB | 4.1 GiB | 813K | 18.0M |
+| SSD | 64 MiB | 9.8 GiB | 1.7M | 43.0M |
+| N/A | 16 GiB | 6.8 GiB |118.2M | 30.2M |
+
+where "reads/sec" is the number of metric data points being read from the database via its API per second and
+"writes/sec" is the number of metric data points being written to the database per second.
+
+Notice that the HDD numbers are pretty high and not much slower than the SSD numbers. This is thanks to the database
+engine design being optimized for rotating media. In the database engine disk I/O requests are:
+
+- asynchronous to mask the high I/O latency of HDDs.
+- mostly large to reduce the amount of HDD seeking time.
+- mostly sequential to reduce the amount of HDD seeking time.
+- compressed to reduce the amount of required throughput.
+
+As a result, the HDD is not thousands of times slower than the SSD, which is typical for other workloads.
+
+An interesting observation to make is that the CPU-bound run (16 GiB page cache) generates fewer data than the SSD run
+(6.8 GiB vs 9.8 GiB). The reason is that the 32 reader threads in the SSD scenario are more frequently blocked by I/O,
+and generate a read load of 1.7M/sec, whereas in the CPU-bound scenario the read load is 70 times higher at 118M/sec.
+Consequently, there is a significant degree of interference by the reader threads, that slow down the writer threads.
+This is also possible because the interference effects are greater than the SSD impact on data generation throughput.
+
[![analytics](https://www.google-analytics.com/collect?v=1&aip=1&t=pageview&_s=1&ds=github&dr=https%3A%2F%2Fgithub.com%2Fnetdata%2Fnetdata&dl=https%3A%2F%2Fmy-netdata.io%2Fgithub%2Fdatabase%2Fengine%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)](<>)
diff --git a/database/engine/pagecache.c b/database/engine/pagecache.c
index 457bcb218..a419ba981 100644
--- a/database/engine/pagecache.c
+++ b/database/engine/pagecache.c
@@ -209,9 +209,31 @@ static void pg_cache_release_pages(struct rrdengine_instance *ctx, unsigned numb
pg_cache_release_pages_unsafe(ctx, number);
uv_rwlock_wrunlock(&pg_cache->pg_cache_rwlock);
}
+
+/*
+ * This function returns the maximum number of pages allowed in the page cache.
+ * The caller must hold the page cache lock.
+ */
+static inline unsigned long pg_cache_hard_limit(struct rrdengine_instance *ctx)
+{
+ /* it's twice the number of producers since we pin 2 pages per producer */
+ return ctx->max_cache_pages + 2 * (unsigned long)ctx->stats.metric_API_producers;
+}
+
+/*
+ * This function returns the low watermark number of pages in the page cache. The page cache should strive to keep the
+ * number of pages below that number.
+ * The caller must hold the page cache lock.
+ */
+static inline unsigned long pg_cache_soft_limit(struct rrdengine_instance *ctx)
+{
+ /* it's twice the number of producers since we pin 2 pages per producer */
+ return ctx->cache_pages_low_watermark + 2 * (unsigned long)ctx->stats.metric_API_producers;
+}
+
/*
* This function will block until it reserves #number populated pages.
- * It will trigger evictions or dirty page flushing if the ctx->max_cache_pages limit is hit.
+ * It will trigger evictions or dirty page flushing if the pg_cache_hard_limit() limit is hit.
*/
static void pg_cache_reserve_pages(struct rrdengine_instance *ctx, unsigned number)
{
@@ -223,10 +245,10 @@ static void pg_cache_reserve_pages(struct rrdengine_instance *ctx, unsigned numb
assert(number < ctx->max_cache_pages);
uv_rwlock_wrlock(&pg_cache->pg_cache_rwlock);
- if (pg_cache->populated_pages + number >= ctx->max_cache_pages + 1)
+ if (pg_cache->populated_pages + number >= pg_cache_hard_limit(ctx) + 1)
debug(D_RRDENGINE, "==Page cache full. Reserving %u pages.==",
number);
- while (pg_cache->populated_pages + number >= ctx->max_cache_pages + 1) {
+ while (pg_cache->populated_pages + number >= pg_cache_hard_limit(ctx) + 1) {
if (!pg_cache_try_evict_one_page_unsafe(ctx)) {
/* failed to evict */
@@ -260,7 +282,7 @@ static void pg_cache_reserve_pages(struct rrdengine_instance *ctx, unsigned numb
/*
* This function will attempt to reserve #number populated pages.
- * It may trigger evictions if the ctx->cache_pages_low_watermark limit is hit.
+ * It may trigger evictions if the pg_cache_soft_limit() limit is hit.
* Returns 0 on failure and 1 on success.
*/
static int pg_cache_try_reserve_pages(struct rrdengine_instance *ctx, unsigned number)
@@ -272,7 +294,7 @@ static int pg_cache_try_reserve_pages(struct rrdengine_instance *ctx, unsigned n
assert(number < ctx->max_cache_pages);
uv_rwlock_wrlock(&pg_cache->pg_cache_rwlock);
- if (pg_cache->populated_pages + number >= ctx->cache_pages_low_watermark + 1) {
+ if (pg_cache->populated_pages + number >= pg_cache_soft_limit(ctx) + 1) {
debug(D_RRDENGINE,
"==Page cache full. Trying to reserve %u pages.==",
number);
@@ -280,11 +302,11 @@ static int pg_cache_try_reserve_pages(struct rrdengine_instance *ctx, unsigned n
if (!pg_cache_try_evict_one_page_unsafe(ctx))
break;
++count;
- } while (pg_cache->populated_pages + number >= ctx->cache_pages_low_watermark + 1);
+ } while (pg_cache->populated_pages + number >= pg_cache_soft_limit(ctx) + 1);
debug(D_RRDENGINE, "Evicted %u pages.", count);
}
- if (pg_cache->populated_pages + number < ctx->max_cache_pages + 1) {
+ if (pg_cache->populated_pages + number < pg_cache_hard_limit(ctx) + 1) {
pg_cache->populated_pages += number;
ret = 1; /* success */
}
diff --git a/database/engine/pagecache.h b/database/engine/pagecache.h
index d464211e9..ab1a5c1ad 100644
--- a/database/engine/pagecache.h
+++ b/database/engine/pagecache.h
@@ -183,4 +183,42 @@ extern void free_page_cache(struct rrdengine_instance *ctx);
extern void pg_cache_add_new_metric_time(struct pg_cache_page_index *page_index, struct rrdeng_page_descr *descr);
extern void pg_cache_update_metric_times(struct pg_cache_page_index *page_index);
+static inline void
+ pg_cache_atomic_get_pg_info(struct rrdeng_page_descr *descr, usec_t *end_timep, uint32_t *page_lengthp)
+{
+ usec_t end_time, old_end_time;
+ uint32_t page_length;
+
+ if (NULL == descr->extent) {
+ /* this page is currently being modified, get consistent info locklessly */
+ do {
+ end_time = descr->end_time;
+ __sync_synchronize();
+ old_end_time = end_time;
+ page_length = descr->page_length;
+ __sync_synchronize();
+ end_time = descr->end_time;
+ __sync_synchronize();
+ } while ((end_time != old_end_time || (end_time & 1) != 0));
+
+ *end_timep = end_time;
+ *page_lengthp = page_length;
+ } else {
+ *end_timep = descr->end_time;
+ *page_lengthp = descr->page_length;
+ }
+}
+
+/* The caller must hold a reference to the page and must have already set the new data */
+static inline void pg_cache_atomic_set_pg_info(struct rrdeng_page_descr *descr, usec_t end_time, uint32_t page_length)
+{
+ assert(!(end_time & 1));
+ __sync_synchronize();
+ descr->end_time |= 1; /* mark start of uncertainty period by adding 1 microsecond */
+ __sync_synchronize();
+ descr->page_length = page_length;
+ __sync_synchronize();
+ descr->end_time = end_time; /* mark end of uncertainty period */
+}
+
#endif /* NETDATA_PAGECACHE_H */
diff --git a/database/engine/rrdengine.c b/database/engine/rrdengine.c
index 36d917541..896d71f16 100644
--- a/database/engine/rrdengine.c
+++ b/database/engine/rrdengine.c
@@ -5,6 +5,8 @@
rrdeng_stats_t global_io_errors = 0;
rrdeng_stats_t global_fs_errors = 0;
+rrdeng_stats_t global_pg_cache_warnings = 0;
+rrdeng_stats_t global_pg_cache_errors = 0;
rrdeng_stats_t rrdeng_reserved_file_descriptors = 0;
void sanity_check(void)
@@ -251,13 +253,10 @@ void flush_pages_cb(uv_fs_t* req)
{
struct rrdengine_worker_config* wc = req->loop->data;
struct rrdengine_instance *ctx = wc->ctx;
- struct page_cache *pg_cache = &ctx->pg_cache;
struct extent_io_descriptor *xt_io_descr;
struct rrdeng_page_descr *descr;
struct page_cache_descr *pg_cache_descr;
- int ret;
unsigned i, count;
- Word_t commit_id;
xt_io_descr = req->data;
if (req->result < 0) {
@@ -277,13 +276,6 @@ void flush_pages_cb(uv_fs_t* req)
/* care, we don't hold the descriptor mutex */
descr = xt_io_descr->descr_array[i];
- uv_rwlock_wrlock(&pg_cache->commited_page_index.lock);
- commit_id = xt_io_descr->descr_commit_idx_array[i];
- ret = JudyLDel(&pg_cache->commited_page_index.JudyL_array, commit_id, PJE0);
- assert(1 == ret);
- --pg_cache->commited_page_index.nr_commited_pages;
- uv_rwlock_wrunlock(&pg_cache->commited_page_index.lock);
-
pg_cache_replaceQ_insert(ctx, descr);
rrdeng_page_descr_mutex_lock(ctx, descr);
@@ -331,7 +323,7 @@ static int do_flush_pages(struct rrdengine_worker_config* wc, int force, struct
if (force) {
debug(D_RRDENGINE, "Asynchronous flushing of extent has been forced by page pressure.");
}
- uv_rwlock_rdlock(&pg_cache->commited_page_index.lock);
+ uv_rwlock_wrlock(&pg_cache->commited_page_index.lock);
for (Index = 0, count = 0, uncompressed_payload_length = 0,
PValue = JudyLFirst(pg_cache->commited_page_index.JudyL_array, &Index, PJE0),
descr = unlikely(NULL == PValue) ? NULL : *PValue ;
@@ -340,11 +332,15 @@ static int do_flush_pages(struct rrdengine_worker_config* wc, int force, struct
PValue = JudyLNext(pg_cache->commited_page_index.JudyL_array, &Index, PJE0),
descr = unlikely(NULL == PValue) ? NULL : *PValue) {
+ uint8_t page_write_pending;
+
assert(0 != descr->page_length);
+ page_write_pending = 0;
rrdeng_page_descr_mutex_lock(ctx, descr);
pg_cache_descr = descr->pg_cache_descr;
if (!(pg_cache_descr->flags & RRD_PAGE_WRITE_PENDING)) {
+ page_write_pending = 1;
/* care, no reference being held */
pg_cache_descr->flags |= RRD_PAGE_WRITE_PENDING;
uncompressed_payload_length += descr->page_length;
@@ -352,8 +348,14 @@ static int do_flush_pages(struct rrdengine_worker_config* wc, int force, struct
eligible_pages[count++] = descr;
}
rrdeng_page_descr_mutex_unlock(ctx, descr);
+
+ if (page_write_pending) {
+ ret = JudyLDel(&pg_cache->commited_page_index.JudyL_array, Index, PJE0);
+ assert(1 == ret);
+ --pg_cache->commited_page_index.nr_commited_pages;
+ }
}
- uv_rwlock_rdunlock(&pg_cache->commited_page_index.lock);
+ uv_rwlock_wrunlock(&pg_cache->commited_page_index.lock);
if (!count) {
debug(D_RRDENGINE, "%s: no pages eligible for flushing.", __func__);
@@ -813,47 +815,6 @@ error_after_loop_init:
complete(&ctx->rrdengine_completion);
}
-
-#define NR_PAGES (256)
-static void basic_functional_test(struct rrdengine_instance *ctx)
-{
- int i, j, failed_validations;
- uuid_t uuid[NR_PAGES];
- void *buf;
- struct rrdeng_page_descr *handle[NR_PAGES];
- char uuid_str[UUID_STR_LEN];
- char backup[NR_PAGES][UUID_STR_LEN * 100]; /* backup storage for page data verification */
-
- for (i = 0 ; i < NR_PAGES ; ++i) {
- uuid_generate(uuid[i]);
- uuid_unparse_lower(uuid[i], uuid_str);
-// fprintf(stderr, "Generated uuid[%d]=%s\n", i, uuid_str);
- buf = rrdeng_create_page(ctx, &uuid[i], &handle[i]);
- /* Each page contains 10 times its own UUID stringified */
- for (j = 0 ; j < 100 ; ++j) {
- strcpy(buf + UUID_STR_LEN * j, uuid_str);
- strcpy(backup[i] + UUID_STR_LEN * j, uuid_str);
- }
- rrdeng_commit_page(ctx, handle[i], (Word_t)i);
- }
- fprintf(stderr, "\n********** CREATED %d METRIC PAGES ***********\n\n", NR_PAGES);
- failed_validations = 0;
- for (i = 0 ; i < NR_PAGES ; ++i) {
- buf = rrdeng_get_latest_page(ctx, &uuid[i], (void **)&handle[i]);
- if (NULL == buf) {
- ++failed_validations;
- fprintf(stderr, "Page %d was LOST.\n", i);
- }
- if (memcmp(backup[i], buf, UUID_STR_LEN * 100)) {
- ++failed_validations;
- fprintf(stderr, "Page %d data comparison with backup FAILED validation.\n", i);
- }
- rrdeng_put_page(ctx, handle[i]);
- }
- fprintf(stderr, "\n********** CORRECTLY VALIDATED %d/%d METRIC PAGES ***********\n\n",
- NR_PAGES - failed_validations, NR_PAGES);
-
-}
/* C entry point for development purposes
* make "LDFLAGS=-errdengine_main"
*/
@@ -866,8 +827,6 @@ void rrdengine_main(void)
if (ret) {
exit(ret);
}
- basic_functional_test(ctx);
-
rrdeng_exit(ctx);
fprintf(stderr, "Hello world!");
exit(0);
diff --git a/database/engine/rrdengineapi.c b/database/engine/rrdengineapi.c
index bf373f31c..5fa23d8fd 100644
--- a/database/engine/rrdengineapi.c
+++ b/database/engine/rrdengineapi.c
@@ -4,7 +4,7 @@
/* Default global database instance */
static struct rrdengine_instance default_global_ctx;
-int default_rrdeng_page_cache_mb = RRDENG_MIN_PAGE_CACHE_SIZE_MB;
+int default_rrdeng_page_cache_mb = 32;
int default_rrdeng_disk_quota_mb = RRDENG_MIN_DISK_SPACE_MB;
/*
@@ -95,9 +95,8 @@ void rrdeng_store_metric_flush_current_page(RRDDIM *rd)
if (likely(descr->page_length)) {
int ret, page_is_empty;
-#ifdef NETDATA_INTERNAL_CHECKS
rrd_stat_atomic_add(&ctx->stats.metric_API_producers, -1);
-#endif
+
if (handle->prev_descr) {
/* unpin old second page */
pg_cache_put(ctx, handle->prev_descr);
@@ -185,16 +184,14 @@ void rrdeng_store_metric_next(RRDDIM *rd, usec_t point_in_time, storage_number n
}
page = descr->pg_cache_descr->page;
page[descr->page_length / sizeof(number)] = number;
- descr->end_time = point_in_time;
- descr->page_length += sizeof(number);
+ pg_cache_atomic_set_pg_info(descr, point_in_time, descr->page_length + sizeof(number));
+
if (perfect_page_alignment)
rd->rrdset->rrddim_page_alignment = descr->page_length;
if (unlikely(INVALID_TIME == descr->start_time)) {
descr->start_time = point_in_time;
-#ifdef NETDATA_INTERNAL_CHECKS
rrd_stat_atomic_add(&ctx->stats.metric_API_producers, 1);
-#endif
pg_cache_insert(ctx, handle->page_index, descr);
} else {
pg_cache_add_new_metric_time(handle->page_index, descr);
@@ -312,8 +309,9 @@ unsigned rrdeng_variable_step_boundaries(RRDSET *st, time_t start_time, time_t e
curr = &page_info_array[i];
*pginfo_to_points(curr) = 0; /* initialize to invalid page */
*pginfo_to_dt(curr) = 0; /* no known data collection interval yet */
- if (unlikely(INVALID_TIME == curr->start_time || INVALID_TIME == curr->end_time)) {
- info("Ignoring page with invalid timestamp.");
+ if (unlikely(INVALID_TIME == curr->start_time || INVALID_TIME == curr->end_time ||
+ curr->end_time < curr->start_time)) {
+ info("Ignoring page with invalid timestamps.");
prev = old_prev;
continue;
}
@@ -366,7 +364,7 @@ unsigned rrdeng_variable_step_boundaries(RRDSET *st, time_t start_time, time_t e
continue;
}
- if (unlikely(0 == dt)) { /* unknown data collection interval */
+ if (unlikely(0 == *pginfo_to_dt(curr))) { /* unknown data collection interval */
assert(1 == page_points);
if (likely(NULL != prev)) { /* get interval from previous page */
@@ -454,7 +452,8 @@ storage_number rrdeng_load_metric_next(struct rrddim_query_handle *rrdimm_handle
struct rrdeng_page_descr *descr;
storage_number *page, ret;
unsigned position, entries;
- usec_t next_page_time, current_position_time;
+ usec_t next_page_time, current_position_time, page_end_time;
+ uint32_t page_length;
handle = &rrdimm_handle->rrdeng;
if (unlikely(INVALID_TIME == handle->next_page_time)) {
@@ -464,15 +463,17 @@ storage_number rrdeng_load_metric_next(struct rrddim_query_handle *rrdimm_handle
if (unlikely(NULL == (descr = handle->descr))) {
/* it's the first call */
next_page_time = handle->next_page_time * USEC_PER_SEC;
+ } else {
+ pg_cache_atomic_get_pg_info(descr, &page_end_time, &page_length);
}
position = handle->position + 1;
if (unlikely(NULL == descr ||
- position >= (descr->page_length / sizeof(storage_number)))) {
+ position >= (page_length / sizeof(storage_number)))) {
/* We need to get a new page */
if (descr) {
/* Drop old page's reference */
- handle->next_page_time = (descr->end_time / USEC_PER_SEC) + 1;
+ handle->next_page_time = (page_end_time / USEC_PER_SEC) + 1;
if (unlikely(handle->next_page_time > rrdimm_handle->end_time)) {
goto no_more_metrics;
}
@@ -492,26 +493,27 @@ storage_number rrdeng_load_metric_next(struct rrddim_query_handle *rrdimm_handle
rrd_stat_atomic_add(&ctx->stats.metric_API_consumers, 1);
#endif
handle->descr = descr;
+ pg_cache_atomic_get_pg_info(descr, &page_end_time, &page_length);
if (unlikely(INVALID_TIME == descr->start_time ||
- INVALID_TIME == descr->end_time)) {
+ INVALID_TIME == page_end_time)) {
goto no_more_metrics;
}
- if (unlikely(descr->start_time != descr->end_time && next_page_time > descr->start_time)) {
+ if (unlikely(descr->start_time != page_end_time && next_page_time > descr->start_time)) {
/* we're in the middle of the page somewhere */
- entries = descr->page_length / sizeof(storage_number);
- position = ((uint64_t)(next_page_time - descr->start_time)) * entries /
- (descr->end_time - descr->start_time + 1);
+ entries = page_length / sizeof(storage_number);
+ position = ((uint64_t)(next_page_time - descr->start_time)) * (entries - 1) /
+ (page_end_time - descr->start_time);
} else {
position = 0;
}
}
page = descr->pg_cache_descr->page;
ret = page[position];
- entries = descr->page_length / sizeof(storage_number);
+ entries = page_length / sizeof(storage_number);
if (entries > 1) {
usec_t dt;
- dt = (descr->end_time - descr->start_time) / (entries - 1);
+ dt = (page_end_time - descr->start_time) / (entries - 1);
current_position_time = descr->start_time + position * dt;
} else {
current_position_time = descr->start_time;
diff --git a/database/engine/rrdengineapi.h b/database/engine/rrdengineapi.h
index 9b1ab1874..c876705e4 100644
--- a/database/engine/rrdengineapi.h
+++ b/database/engine/rrdengineapi.h
@@ -5,7 +5,7 @@
#include "rrdengine.h"
-#define RRDENG_MIN_PAGE_CACHE_SIZE_MB (32)
+#define RRDENG_MIN_PAGE_CACHE_SIZE_MB (8)
#define RRDENG_MIN_DISK_SPACE_MB (256)
#define RRDENG_NR_STATS (33)
diff --git a/database/engine/rrdenginelib.c b/database/engine/rrdenginelib.c
index 96504b275..1a04dc2a4 100644
--- a/database/engine/rrdenginelib.c
+++ b/database/engine/rrdenginelib.c
@@ -8,7 +8,7 @@ void print_page_cache_descr(struct rrdeng_page_descr *descr)
{
struct page_cache_descr *pg_cache_descr = descr->pg_cache_descr;
char uuid_str[UUID_STR_LEN];
- char str[BUFSIZE];
+ char str[BUFSIZE + 1];
int pos = 0;
uuid_unparse_lower(*descr->id, uuid_str);
@@ -31,7 +31,7 @@ void print_page_cache_descr(struct rrdeng_page_descr *descr)
void print_page_descr(struct rrdeng_page_descr *descr)
{
char uuid_str[UUID_STR_LEN];
- char str[BUFSIZE];
+ char str[BUFSIZE + 1];
int pos = 0;
uuid_unparse_lower(*descr->id, uuid_str);
diff --git a/database/rrd.c b/database/rrd.c
index 31ad3f07e..dcab65189 100644
--- a/database/rrd.c
+++ b/database/rrd.c
@@ -15,7 +15,11 @@ int rrd_delete_unupdated_dimensions = 0;
int default_rrd_update_every = UPDATE_EVERY;
int default_rrd_history_entries = RRD_DEFAULT_HISTORY_ENTRIES;
+#ifdef ENABLE_DBENGINE
+RRD_MEMORY_MODE default_rrd_memory_mode = RRD_MEMORY_MODE_DBENGINE;
+#else
RRD_MEMORY_MODE default_rrd_memory_mode = RRD_MEMORY_MODE_SAVE;
+#endif
int gap_when_lost_iterations_above = 1;
diff --git a/database/rrd.h b/database/rrd.h
index 39e881252..e335f0dd0 100644
--- a/database/rrd.h
+++ b/database/rrd.h
@@ -697,6 +697,7 @@ struct rrdhost {
// RRDCALCs may be linked to charts at any point
// (charts may or may not exist when these are loaded)
RRDCALC *alarms;
+ RRDCALC *alarms_with_foreach;
avl_tree_lock alarms_idx_health_log;
avl_tree_lock alarms_idx_name;
@@ -709,6 +710,7 @@ struct rrdhost {
// these are used to create alarms when charts
// are created or renamed, that match them
RRDCALCTEMPLATE *templates;
+ RRDCALCTEMPLATE *alarms_template_with_foreach;
// ------------------------------------------------------------------------
@@ -1008,6 +1010,7 @@ static inline time_t rrdset_slot2time(RRDSET *st, size_t slot) {
// ----------------------------------------------------------------------------
// RRD DIMENSION functions
+extern void rrdcalc_link_to_rrddim(RRDDIM *rd, RRDSET *st, RRDHOST *host);
extern RRDDIM *rrddim_add_custom(RRDSET *st, const char *id, const char *name, collected_number multiplier, collected_number divisor, RRD_ALGORITHM algorithm, RRD_MEMORY_MODE memory_mode);
#define rrddim_add(st, id, name, multiplier, divisor, algorithm) rrddim_add_custom(st, id, name, multiplier, divisor, algorithm, (st)->rrd_memory_mode)
diff --git a/database/rrdcalc.c b/database/rrdcalc.c
index 908fc2ebf..9f16ce374 100644
--- a/database/rrdcalc.c
+++ b/database/rrdcalc.c
@@ -255,6 +255,53 @@ inline uint32_t rrdcalc_get_unique_id(RRDHOST *host, const char *chart, const ch
return host->health_log.next_alarm_id++;
}
+/**
+ * Alarm name with dimension
+ *
+ * Change the name of the current alarm appending a new diagram.
+ *
+ * @param name the alarm name
+ * @param namelen is the length of the previous vector.
+ * @param dim the dimension of the chart.
+ * @param dimlen is the length of the previous vector.
+ *
+ * @return It returns the new name on success and the old otherwise
+ */
+char *alarm_name_with_dim(char *name, size_t namelen, const char *dim, size_t dimlen) {
+ char *newname,*move;
+
+ newname = malloc(namelen + dimlen + 2);
+ if(newname) {
+ move = newname;
+ memcpy(move, name, namelen);
+ move += namelen;
+
+ *move++ = '_';
+ memcpy(move, dim, dimlen);
+ move += dimlen;
+ *move = '\0';
+ } else {
+ newname = name;
+ }
+
+ return newname;
+}
+
+/**
+ * Remove pipe comma
+ *
+ * Remove the pipes and commas converting to space.
+ *
+ * @param str the string to change.
+ */
+void dimension_remove_pipe_comma(char *str) {
+ while(*str) {
+ if(*str == '|' || *str == ',') *str = ' ';
+
+ str++;
+ }
+}
+
inline void rrdcalc_add_to_host(RRDHOST *host, RRDCALC *rc) {
rrdhost_check_rdlock(host);
@@ -282,24 +329,39 @@ inline void rrdcalc_add_to_host(RRDHOST *host, RRDCALC *rc) {
rc->critical->rrdcalc = rc;
}
- // link it to the host
- if(likely(host->alarms)) {
- // append it
- RRDCALC *t;
- for(t = host->alarms; t && t->next ; t = t->next) ;
- t->next = rc;
- }
- else {
- host->alarms = rc;
- }
+ if(!rc->foreachdim) {
+ // link it to the host alarms list
+ if(likely(host->alarms)) {
+ // append it
+ RRDCALC *t;
+ for(t = host->alarms; t && t->next ; t = t->next) ;
+ t->next = rc;
+ }
+ else {
+ host->alarms = rc;
+ }
- // link it to its chart
- RRDSET *st;
- rrdset_foreach_read(st, host) {
- if(rrdcalc_is_matching_this_rrdset(rc, st)) {
- rrdsetcalc_link(st, rc);
- break;
+ // link it to its chart
+ RRDSET *st;
+ rrdset_foreach_read(st, host) {
+ if(rrdcalc_is_matching_this_rrdset(rc, st)) {
+ rrdsetcalc_link(st, rc);
+ break;
+ }
+ }
+ } else {
+ //link it case there is a foreach
+ if(likely(host->alarms_with_foreach)) {
+ // append it
+ RRDCALC *t;
+ for(t = host->alarms_with_foreach; t && t->next ; t = t->next) ;
+ t->next = rc;
}
+ else {
+ host->alarms_with_foreach = rc;
+ }
+
+ //I am not linking this alarm direct to the host here, this will be done when the children is created
}
}
@@ -311,13 +373,19 @@ inline RRDCALC *rrdcalc_create_from_template(RRDHOST *host, RRDCALCTEMPLATE *rt,
RRDCALC *rc = callocz(1, sizeof(RRDCALC));
rc->next_event_id = 1;
- rc->id = rrdcalc_get_unique_id(host, chart, rt->name, &rc->next_event_id);
rc->name = strdupz(rt->name);
rc->hash = simple_hash(rc->name);
rc->chart = strdupz(chart);
rc->hash_chart = simple_hash(rc->chart);
+ rc->id = rrdcalc_get_unique_id(host, rc->chart, rc->name, &rc->next_event_id);
+
if(rt->dimensions) rc->dimensions = strdupz(rt->dimensions);
+ if(rt->foreachdim) {
+ rc->foreachdim = strdupz(rt->foreachdim);
+ rc->spdim = health_pattern_from_foreach(rc->foreachdim);
+ }
+ rc->foreachcounter = rt->foreachcounter;
rc->green = rt->green;
rc->red = rt->red;
@@ -361,7 +429,7 @@ inline RRDCALC *rrdcalc_create_from_template(RRDHOST *host, RRDCALCTEMPLATE *rt,
error("Health alarm '%s.%s': failed to re-parse critical expression '%s'", chart, rt->name, rt->critical->source);
}
- debug(D_HEALTH, "Health runtime added alarm '%s.%s': exec '%s', recipient '%s', green " CALCULATED_NUMBER_FORMAT_AUTO ", red " CALCULATED_NUMBER_FORMAT_AUTO ", lookup: group %d, after %d, before %d, options %u, dimensions '%s', update every %d, calculation '%s', warning '%s', critical '%s', source '%s', delay up %d, delay down %d, delay max %d, delay_multiplier %f, warn_repeat_every %u, crit_repeat_every %u",
+ debug(D_HEALTH, "Health runtime added alarm '%s.%s': exec '%s', recipient '%s', green " CALCULATED_NUMBER_FORMAT_AUTO ", red " CALCULATED_NUMBER_FORMAT_AUTO ", lookup: group %d, after %d, before %d, options %u, dimensions '%s', for each dimension '%s', update every %d, calculation '%s', warning '%s', critical '%s', source '%s', delay up %d, delay down %d, delay max %d, delay_multiplier %f, warn_repeat_every %u, crit_repeat_every %u",
(rc->chart)?rc->chart:"NOCHART",
rc->name,
(rc->exec)?rc->exec:"DEFAULT",
@@ -373,6 +441,7 @@ inline RRDCALC *rrdcalc_create_from_template(RRDHOST *host, RRDCALCTEMPLATE *rt,
rc->before,
rc->options,
(rc->dimensions)?rc->dimensions:"NONE",
+ (rc->foreachdim)?rc->foreachdim:"NONE",
rc->update_every,
(rc->calculation)?rc->calculation->parsed_as:"NONE",
(rc->warning)?rc->warning->parsed_as:"NONE",
@@ -387,18 +456,94 @@ inline RRDCALC *rrdcalc_create_from_template(RRDHOST *host, RRDCALCTEMPLATE *rt,
);
rrdcalc_add_to_host(host, rc);
- RRDCALC *rdcmp = (RRDCALC *) avl_insert_lock(&(host)->alarms_idx_health_log,(avl *)rc);
- if (rdcmp != rc) {
- error("Cannot insert the alarm index ID %s",rc->name);
+ if(!rt->foreachdim) {
+ RRDCALC *rdcmp = (RRDCALC *) avl_insert_lock(&(host)->alarms_idx_health_log,(avl *)rc);
+ if (rdcmp != rc) {
+ error("Cannot insert the alarm index ID %s",rc->name);
+ }
}
return rc;
}
+/**
+ * Create from RRDCALC
+ *
+ * Create a new alarm using another alarm as template.
+ *
+ * @param rc is the alarm that will be used as source
+ * @param host is the host structure.
+ * @param name is the newest chart name.
+ * @param dimension is the current dimension
+ * @param foreachdim the whole list of dimension
+ *
+ * @return it returns the new alarm changed.
+ */
+inline RRDCALC *rrdcalc_create_from_rrdcalc(RRDCALC *rc, RRDHOST *host, const char *name, const char *dimension) {
+ RRDCALC *newrc = callocz(1, sizeof(RRDCALC));
+
+ newrc->next_event_id = 1;
+ newrc->id = rrdcalc_get_unique_id(host, rc->chart, name, &rc->next_event_id);
+ newrc->name = (char *)name;
+ newrc->hash = simple_hash(newrc->name);
+ newrc->chart = strdupz(rc->chart);
+ newrc->hash_chart = simple_hash(rc->chart);
+
+ newrc->dimensions = strdupz(dimension);
+ newrc->foreachdim = NULL;
+ rc->foreachcounter++;
+ newrc->foreachcounter = rc->foreachcounter;
+
+ newrc->green = rc->green;
+ newrc->red = rc->red;
+ newrc->value = NAN;
+ newrc->old_value = NAN;
+
+ newrc->delay_up_duration = rc->delay_up_duration;
+ newrc->delay_down_duration = rc->delay_down_duration;
+ newrc->delay_max_duration = rc->delay_max_duration;
+ newrc->delay_multiplier = rc->delay_multiplier;
+
+ newrc->last_repeat = 0;
+ newrc->warn_repeat_every = rc->warn_repeat_every;
+ newrc->crit_repeat_every = rc->crit_repeat_every;
+
+ newrc->group = rc->group;
+ newrc->after = rc->after;
+ newrc->before = rc->before;
+ newrc->update_every = rc->update_every;
+ newrc->options = rc->options;
+
+ if(rc->exec) newrc->exec = strdupz(rc->exec);
+ if(rc->recipient) newrc->recipient = strdupz(rc->recipient);
+ if(rc->source) newrc->source = strdupz(rc->source);
+ if(rc->units) newrc->units = strdupz(rc->units);
+ if(rc->info) newrc->info = strdupz(rc->info);
+
+ if(rc->calculation) {
+ newrc->calculation = expression_parse(rc->calculation->source, NULL, NULL);
+ if(!newrc->calculation)
+ error("Health alarm '%s.%s': failed to parse calculation expression '%s'", rc->chart, rc->name, rc->calculation->source);
+ }
+
+ if(rc->warning) {
+ newrc->warning = expression_parse(rc->warning->source, NULL, NULL);
+ if(!newrc->warning)
+ error("Health alarm '%s.%s': failed to re-parse warning expression '%s'", rc->chart, rc->name, rc->warning->source);
+ }
+
+ if(rc->critical) {
+ newrc->critical = expression_parse(rc->critical->source, NULL, NULL);
+ if(!newrc->critical)
+ error("Health alarm '%s.%s': failed to re-parse critical expression '%s'", rc->chart, rc->name, rc->critical->source);
+ }
+
+ return newrc;
+}
+
void rrdcalc_free(RRDCALC *rc) {
if(unlikely(!rc)) return;
-
expression_free(rc->calculation);
expression_free(rc->warning);
expression_free(rc->critical);
@@ -407,11 +552,13 @@ void rrdcalc_free(RRDCALC *rc) {
freez(rc->chart);
freez(rc->family);
freez(rc->dimensions);
+ freez(rc->foreachdim);
freez(rc->exec);
freez(rc->recipient);
freez(rc->source);
freez(rc->units);
freez(rc->info);
+ simple_pattern_free(rc->spdim);
freez(rc);
}
@@ -437,21 +584,19 @@ void rrdcalc_unlink_and_free(RRDHOST *host, RRDCALC *rc) {
error("Cannot unlink alarm '%s.%s' from host '%s': not found", rc->chart?rc->chart:"NOCHART", rc->name, host->hostname);
}
- if (rc) {
- RRDCALC *rdcmp = (RRDCALC *) avl_search_lock(&(host)->alarms_idx_health_log, (avl *)rc);
- if (rdcmp) {
- rdcmp = (RRDCALC *) avl_remove_lock(&(host)->alarms_idx_health_log, (avl *)rc);
- if (!rdcmp) {
- error("Cannot remove the health alarm index from health_log");
- }
+ RRDCALC *rdcmp = (RRDCALC *) avl_search_lock(&(host)->alarms_idx_health_log, (avl *)rc);
+ if (rdcmp) {
+ rdcmp = (RRDCALC *) avl_remove_lock(&(host)->alarms_idx_health_log, (avl *)rc);
+ if (!rdcmp) {
+ error("Cannot remove the health alarm index from health_log");
}
+ }
- rdcmp = (RRDCALC *) avl_search_lock(&(host)->alarms_idx_name, (avl *)rc);
- if (rdcmp) {
- rdcmp = (RRDCALC *) avl_remove_lock(&(host)->alarms_idx_name, (avl *)rc);
- if (!rdcmp) {
- error("Cannot remove the health alarm index from idx_name");
- }
+ rdcmp = (RRDCALC *) avl_search_lock(&(host)->alarms_idx_name, (avl *)rc);
+ if (rdcmp) {
+ rdcmp = (RRDCALC *) avl_remove_lock(&(host)->alarms_idx_name, (avl *)rc);
+ if (!rdcmp) {
+ error("Cannot remove the health alarm index from idx_name");
}
}
diff --git a/database/rrdcalc.h b/database/rrdcalc.h
index f0c34b543..e0b632597 100644
--- a/database/rrdcalc.h
+++ b/database/rrdcalc.h
@@ -37,7 +37,7 @@ struct rrdcalc {
uint32_t next_event_id; // the next event id that will be used for this alarm
char *name; // the name of this alarm
- uint32_t hash;
+ uint32_t hash; // the hash of the alarm name
char *exec; // the command to execute when this alarm switches state
char *recipient; // the recipient of the alarm (the first parameter to exec)
@@ -59,7 +59,11 @@ struct rrdcalc {
// database lookup settings
char *dimensions; // the chart dimensions
- RRDR_GROUPING group; // grouping method: average, max, etc.
+ char *foreachdim; // the group of dimensions that the `foreach` will be applied.
+ SIMPLE_PATTERN *spdim; // used if and only if there is a simple pattern for the chart.
+ int foreachcounter; // the number of alarms created with foreachdim, this also works as an id of the
+ // children
+ RRDR_GROUPING group; // grouping method: average, max, etc.
int before; // ending point in time-series
int after; // starting point in time-series
uint32_t options; // calculation options
@@ -148,7 +152,10 @@ extern void rrdcalc_unlink_and_free(RRDHOST *host, RRDCALC *rc);
extern int rrdcalc_exists(RRDHOST *host, const char *chart, const char *name, uint32_t hash_chart, uint32_t hash_name);
extern uint32_t rrdcalc_get_unique_id(RRDHOST *host, const char *chart, const char *name, uint32_t *next_event_id);
extern RRDCALC *rrdcalc_create_from_template(RRDHOST *host, RRDCALCTEMPLATE *rt, const char *chart);
+extern RRDCALC *rrdcalc_create_from_rrdcalc(RRDCALC *rc, RRDHOST *host, const char *name, const char *dimension);
extern void rrdcalc_add_to_host(RRDHOST *host, RRDCALC *rc);
+extern void dimension_remove_pipe_comma(char *str);
+extern char *alarm_name_with_dim(char *name, size_t namelen, const char *dim, size_t dimlen);
static inline int rrdcalc_isrepeating(RRDCALC *rc) {
if (unlikely(rc->warn_repeat_every > 0 || rc->crit_repeat_every > 0)) {
diff --git a/database/rrdcalctemplate.c b/database/rrdcalctemplate.c
index f2b9767c6..f7a085561 100644
--- a/database/rrdcalctemplate.c
+++ b/database/rrdcalctemplate.c
@@ -5,23 +5,35 @@
// ----------------------------------------------------------------------------
// RRDCALCTEMPLATE management
+/**
+ * RRDCALC TEMPLATE LINK MATCHING
+ *
+ * @param rt is the template used to create the chart.
+ * @param st is the chart where the alarm will be attached.
+ */
+void rrdcalctemplate_link_matching_test(RRDCALCTEMPLATE *rt, RRDSET *st, RRDHOST *host ) {
+ if(rt->hash_context == st->hash_context && !strcmp(rt->context, st->context)
+ && (!rt->family_pattern || simple_pattern_matches(rt->family_pattern, st->family))) {
+ RRDCALC *rc = rrdcalc_create_from_template(host, rt, st->id);
+ if(unlikely(!rc))
+ info("Health tried to create alarm from template '%s' on chart '%s' of host '%s', but it failed", rt->name, st->id, host->hostname);
+#ifdef NETDATA_INTERNAL_CHECKS
+ else if(rc->rrdset != st && !rc->foreachdim) //When we have a template with foreadhdim, the child will be added to the index late
+ error("Health alarm '%s.%s' should be linked to chart '%s', but it is not", rc->chart?rc->chart:"NOCHART", rc->name, st->id);
+#endif
+ }
+}
void rrdcalctemplate_link_matching(RRDSET *st) {
RRDHOST *host = st->rrdhost;
RRDCALCTEMPLATE *rt;
for(rt = host->templates; rt ; rt = rt->next) {
- if(rt->hash_context == st->hash_context && !strcmp(rt->context, st->context)
- && (!rt->family_pattern || simple_pattern_matches(rt->family_pattern, st->family))) {
- RRDCALC *rc = rrdcalc_create_from_template(host, rt, st->id);
- if(unlikely(!rc))
- info("Health tried to create alarm from template '%s' on chart '%s' of host '%s', but it failed", rt->name, st->id, host->hostname);
+ rrdcalctemplate_link_matching_test(rt, st, host);
+ }
-#ifdef NETDATA_INTERNAL_CHECKS
- else if(rc->rrdset != st)
- error("Health alarm '%s.%s' should be linked to chart '%s', but it is not", rc->chart?rc->chart:"NOCHART", rc->name, st->id);
-#endif
- }
+ for(rt = host->alarms_template_with_foreach; rt ; rt = rt->next) {
+ rrdcalctemplate_link_matching_test(rt, st, host);
}
}
@@ -43,6 +55,8 @@ inline void rrdcalctemplate_free(RRDCALCTEMPLATE *rt) {
freez(rt->units);
freez(rt->info);
freez(rt->dimensions);
+ freez(rt->foreachdim);
+ simple_pattern_free(rt->spdim);
freez(rt);
}
@@ -67,5 +81,3 @@ inline void rrdcalctemplate_unlink_and_free(RRDHOST *host, RRDCALCTEMPLATE *rt)
rrdcalctemplate_free(rt);
}
-
-
diff --git a/database/rrdcalctemplate.h b/database/rrdcalctemplate.h
index 92bb4138e..676b4cf64 100644
--- a/database/rrdcalctemplate.h
+++ b/database/rrdcalctemplate.h
@@ -35,7 +35,11 @@ struct rrdcalctemplate {
// database lookup settings
char *dimensions; // the chart dimensions
- RRDR_GROUPING group; // grouping method: average, max, etc.
+ char *foreachdim; // the group of dimensions that the lookup will be applied.
+ SIMPLE_PATTERN *spdim; // used if and only if there is a simple pattern for the chart.
+ int foreachcounter; // the number of alarms created with foreachdim, this also works as an id of the
+ // children
+ RRDR_GROUPING group; // grouping method: average, max, etc.
int before; // ending point in time-series
int after; // starting point in time-series
uint32_t options; // calculation options
@@ -70,5 +74,5 @@ extern void rrdcalctemplate_link_matching(RRDSET *st);
extern void rrdcalctemplate_free(RRDCALCTEMPLATE *rt);
extern void rrdcalctemplate_unlink_and_free(RRDHOST *host, RRDCALCTEMPLATE *rt);
-
+extern void rrdcalctemplate_create_alarms(RRDHOST *host, RRDCALCTEMPLATE *rt, RRDSET *st);
#endif //NETDATA_RRDCALCTEMPLATE_H
diff --git a/database/rrddim.c b/database/rrddim.c
index 019ca34a1..8ab5a7237 100644
--- a/database/rrddim.c
+++ b/database/rrddim.c
@@ -156,7 +156,37 @@ static time_t rrddim_query_oldest_time(RRDDIM *rd) {
// ----------------------------------------------------------------------------
// RRDDIM create a dimension
+void rrdcalc_link_to_rrddim(RRDDIM *rd, RRDSET *st, RRDHOST *host) {
+ RRDCALC *rrdc;
+ for (rrdc = host->alarms_with_foreach; rrdc ; rrdc = rrdc->next) {
+ if (simple_pattern_matches(rrdc->spdim, rd->id) || simple_pattern_matches(rrdc->spdim, rd->name)) {
+ if (!strcmp(rrdc->chart, st->name)) {
+ char *usename = alarm_name_with_dim(rrdc->name, strlen(rrdc->name), rd->name, strlen(rd->name));
+ if (usename) {
+ if(rrdcalc_exists(host, st->name, usename, 0, 0)){
+ freez(usename);
+ continue;
+ }
+
+ RRDCALC *child = rrdcalc_create_from_rrdcalc(rrdc, host, usename, rd->name);
+ if (child) {
+ rrdcalc_add_to_host(host, child);
+ RRDCALC *rdcmp = (RRDCALC *) avl_insert_lock(&(host)->alarms_idx_health_log,(avl *)child);
+ if (rdcmp != child) {
+ error("Cannot insert the alarm index ID %s",child->name);
+ }
+ } else {
+ error("Cannot allocate a new alarm.");
+ rrdc->foreachcounter--;
+ }
+ }
+ }
+ }
+ }
+}
+
RRDDIM *rrddim_add_custom(RRDSET *st, const char *id, const char *name, collected_number multiplier, collected_number divisor, RRD_ALGORITHM algorithm, RRD_MEMORY_MODE memory_mode) {
+ RRDHOST *host = st->rrdhost;
rrdset_wrlock(st);
rrdset_flag_set(st, RRDSET_FLAG_SYNC_CLOCK);
@@ -175,7 +205,6 @@ RRDDIM *rrddim_add_custom(RRDSET *st, const char *id, const char *name, collecte
return rd;
}
- RRDHOST *host = st->rrdhost;
char filename[FILENAME_MAX + 1];
char fullfilename[FILENAME_MAX + 1];
@@ -371,7 +400,28 @@ RRDDIM *rrddim_add_custom(RRDSET *st, const char *id, const char *name, collecte
if(unlikely(rrddim_index_add(st, rd) != rd))
error("RRDDIM: INTERNAL ERROR: attempt to index duplicate dimension '%s' on chart '%s'", rd->id, st->id);
+ if (host->alarms_with_foreach || host->alarms_template_with_foreach) {
+ int count = 0;
+ int hostlocked;
+ for (count = 0 ; count < 5 ; count++) {
+ hostlocked = netdata_rwlock_trywrlock(&host->rrdhost_rwlock);
+ if (!hostlocked) {
+ rrdcalc_link_to_rrddim(rd, st, host);
+ rrdhost_unlock(host);
+ break;
+ } else if (hostlocked != EBUSY) {
+ error("Cannot lock host to create an alarm for the dimension.");
+ }
+ usleep(200000);
+ }
+
+ if (count == 5) {
+ error("Failed to create an alarm for dimension %s of chart %s 5 times. Skipping alarm."
+ , rd->name, st->name);
+ }
+ }
rrdset_unlock(st);
+
return(rd);
}
diff --git a/database/rrdhost.c b/database/rrdhost.c
index d6252d206..9075787b0 100644
--- a/database/rrdhost.c
+++ b/database/rrdhost.c
@@ -598,9 +598,23 @@ void rrdhost_free(RRDHOST *host) {
while(host->alarms)
rrdcalc_unlink_and_free(host, host->alarms);
+ RRDCALC *rc,*nc;
+ for(rc = host->alarms_with_foreach; rc ; rc = nc) {
+ nc = rc->next;
+ rrdcalc_free(rc);
+ }
+ host->alarms_with_foreach = NULL;
+
while(host->templates)
rrdcalctemplate_unlink_and_free(host, host->templates);
+ RRDCALCTEMPLATE *rt,*next;
+ for(rt = host->alarms_template_with_foreach; rt ; rt = next) {
+ next = rt->next;
+ rrdcalctemplate_free(rt);
+ }
+ host->alarms_template_with_foreach = NULL;
+
debug(D_RRD_CALLS, "RRDHOST: Cleaning up remaining host variables for host '%s'", host->hostname);
rrdvar_free_remaining_variables(host, &host->rrdvar_root_index);
diff --git a/database/rrdset.c b/database/rrdset.c
index f8962b2fb..26df8d737 100644
--- a/database/rrdset.c
+++ b/database/rrdset.c
@@ -150,7 +150,7 @@ int rrdset_set_name(RRDSET *st, const char *name) {
rrdset_strncpyz_name(b, n, CONFIG_MAX_VALUE);
if(rrdset_index_find_name(host, b, 0)) {
- error("RRDSET: chart name '%s' on host '%s' already exists.", b, host->hostname);
+ info("RRDSET: chart name '%s' on host '%s' already exists.", b, host->hostname);
return 0;
}