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# Riak KV collector

Collects database stats from `/stats` endpoint.

## Requirements

-   An accessible `/stats` endpoint. See [the Riak KV configuration reference documentation](https://docs.riak.com/riak/kv/2.2.3/configuring/reference/#client-interfaces)
    for how to enable this.

The following charts are included, which are mostly derived from the metrics
listed
[here](https://docs.riak.com/riak/kv/latest/using/reference/statistics-monitoring/index.html#riak-metrics-to-graph).

1.  **Throughput** in operations/s

-   **KV operations**
    -   gets
    -   puts

-   **Data type updates**
    -   counters
    -   sets
    -   maps

-   **Search queries**
    -   queries

-   **Search documents**
    -   indexed

-   **Strong consistency operations**
    -   gets
    -   puts

2.  **Latency** in milliseconds

-   **KV latency** of the past minute
    -   get (mean, median, 95th / 99th / 100th percentile)
    -   put (mean, median, 95th / 99th / 100th percentile)

-   **Data type latency** of the past minute
    -   counter_merge (mean, median, 95th / 99th / 100th percentile)
    -   set_merge (mean, median, 95th / 99th / 100th percentile)
    -   map_merge (mean, median, 95th / 99th / 100th percentile)

-   **Search latency** of the past minute
    -   query (median, min, max, 95th / 99th percentile)
    -   index (median, min, max, 95th / 99th percentile)

-   **Strong consistency latency** of the past minute
    -   get (mean, median, 95th / 99th / 100th percentile)
    -   put (mean, median, 95th / 99th / 100th percentile)

3.  **Erlang VM metrics**

-   **System counters**
    -   processes

-   **Memory allocation** in MB
    -   processes.allocated
    -   processes.used

4.  **General load / health metrics**

-   **Siblings encountered in KV operations** during the past minute
    -   get (mean, median, 95th / 99th / 100th percentile)

-   **Object size in KV operations** during the past minute in KB
    -   get (mean, median, 95th / 99th / 100th percentile)

-   **Message queue length** in unprocessed messages
    -   vnodeq_size (mean, median, 95th / 99th / 100th percentile)

-   **Index operations** encountered by Search
    -   errors

-   **Protocol buffer connections**
    -   active

-   **Repair operations coordinated by this node**
    -   read

-   **Active finite state machines by kind**
    -   get
    -   put
    -   secondary_index
    -   list_keys

-   **Rejected finite state machines**
    -   get
    -   put

-   **Number of writes to Search failed due to bad data format by reason**
    -   bad_entry
    -   extract_fail

## Configuration

Edit the `python.d/riakkv.conf` configuration file using `edit-config` from the Netdata [config
directory](https://github.com/netdata/netdata/blob/master/docs/configure/nodes.md), which is typically at `/etc/netdata`.

```bash
cd /etc/netdata   # Replace this path with your Netdata config directory, if different
sudo ./edit-config python.d/riakkv.conf
```

The module needs to be passed the full URL to Riak's stats endpoint.
For example:

```yaml
myriak:
  url: http://myriak.example.com:8098/stats
```

With no explicit configuration given, the module will attempt to connect to
`http://localhost:8098/stats`.

The default update frequency for the plugin is set to 2 seconds as Riak
internally updates the metrics every second. If we were to update the metrics
every second, the resulting graph would contain odd jitter.
### Troubleshooting

To troubleshoot issues with the `riakkv` module, run the `python.d.plugin` with the debug option enabled. The 
output will give you the output of the data collection job or error messages on why the collector isn't working.

First, navigate to your plugins directory, usually they are located under `/usr/libexec/netdata/plugins.d/`. If that's 
not the case on your system, open `netdata.conf` and look for the setting `plugins directory`. Once you're in the 
plugin's directory, switch to the `netdata` user.

```bash
cd /usr/libexec/netdata/plugins.d/
sudo su -s /bin/bash netdata
```

Now you can manually run the `riakkv` module in debug mode:

```bash
./python.d.plugin riakkv debug trace
```