Adding upstream version 1.46.3.upstream/1.46.3

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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-<!--
-title: "Monitor a Hadoop cluster with Netdata"
-sidebar_label: "Monitor a Hadoop cluster with Netdata"
-custom_edit_url: https://github.com/netdata/netdata/edit/master/docs/guides/monitor-hadoop-cluster.md
-learn_status: "Published"
-learn_topic_type: "Tasks"
-learn_rel_path: "Miscellaneous"
--->
-
-# Monitor a Hadoop cluster with Netdata
-
-Hadoop is an [Apache project](https://hadoop.apache.org/) is a framework for processing large sets of data across a
-distributed cluster of systems.
-
-And while Hadoop is designed to be a highly-available and fault-tolerant service, those who operate a Hadoop cluster
-will want to monitor the health and performance of their [Hadoop Distributed File System
-(HDFS)](https://hadoop.apache.org/docs/r1.2.1/hdfs_design.html) and [Zookeeper](https://zookeeper.apache.org/)
-implementations.
-
-Netdata comes with built-in and pre-configured support for monitoring both HDFS and Zookeeper.
-
-This guide assumes you have a Hadoop cluster, with HDFS and Zookeeper, running already. If you don't, please follow
-the [official Hadoop
-instructions](http://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-common/SingleCluster.html) or an
-alternative, like the guide available from
-[DigitalOcean](https://www.digitalocean.com/community/tutorials/how-to-install-hadoop-in-stand-alone-mode-on-ubuntu-18-04).
-
-For more specifics on the collection modules used in this guide, read the respective pages in our documentation:
-
--   [HDFS](https://github.com/netdata/netdata/blob/master/src/go/collectors/go.d.plugin/modules/hdfs/README.md)
--   [Zookeeper](https://github.com/netdata/netdata/blob/master/src/go/collectors/go.d.plugin/modules/zookeeper/README.md)
-
-## Set up your HDFS and Zookeeper installations
-
-As with all data sources, Netdata can auto-detect HDFS and Zookeeper nodes if you installed them using the standard
-installation procedure.
-
-For Netdata to collect HDFS metrics, it needs to be able to access the node's `/jmx` endpoint. You can test whether an
-JMX endpoint is accessible by using `curl HDFS-IP:PORT/jmx`. For a NameNode, you should see output similar to the
-following:
-
-```json
-{
-  "beans" : [ {
-    "name" : "Hadoop:service=NameNode,name=JvmMetrics",
-    "modelerType" : "JvmMetrics",
-    "MemNonHeapUsedM" : 65.67851,
-    "MemNonHeapCommittedM" : 67.3125,
-    "MemNonHeapMaxM" : -1.0,
-    "MemHeapUsedM" : 154.46341,
-    "MemHeapCommittedM" : 215.0,
-    "MemHeapMaxM" : 843.0,
-    "MemMaxM" : 843.0,
-    "GcCount" : 15,
-    "GcTimeMillis" : 305,
-    "GcNumWarnThresholdExceeded" : 0,
-    "GcNumInfoThresholdExceeded" : 0,
-    "GcTotalExtraSleepTime" : 92,
-    "ThreadsNew" : 0,
-    "ThreadsRunnable" : 6,
-    "ThreadsBlocked" : 0,
-    "ThreadsWaiting" : 7,
-    "ThreadsTimedWaiting" : 34,
-    "ThreadsTerminated" : 0,
-    "LogFatal" : 0,
-    "LogError" : 0,
-    "LogWarn" : 2,
-    "LogInfo" : 348
-  }, 
-  { ... }
-  ]
-}
-```
-
-The JSON result for a DataNode's `/jmx` endpoint is slightly different:
-
-```json
-{
-  "beans" : [ {
-    "name" : "Hadoop:service=DataNode,name=DataNodeActivity-dev-slave-01.dev.local-9866",
-    "modelerType" : "DataNodeActivity-dev-slave-01.dev.local-9866",
-    "tag.SessionId" : null,
-    "tag.Context" : "dfs",
-    "tag.Hostname" : "dev-slave-01.dev.local",
-    "BytesWritten" : 500960407,
-    "TotalWriteTime" : 463,
-    "BytesRead" : 80689178,
-    "TotalReadTime" : 41203,
-    "BlocksWritten" : 16,
-    "BlocksRead" : 16,
-    "BlocksReplicated" : 4,
-    ...
-  },
-  { ... }
-  ]
-}
-```
-
-If Netdata can't access the `/jmx` endpoint for either a NameNode or DataNode, it will not be able to auto-detect and
-collect metrics from your HDFS implementation.
-
-Zookeeper auto-detection relies on an accessible client port and a allow-listed `mntr` command. For more details on
-`mntr`, see Zookeeper's documentation on [cluster
-options](https://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_clusterOptions) and [Zookeeper
-commands](https://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_zkCommands).
-
-## Configure the HDFS and Zookeeper modules
-
-To configure Netdata's HDFS module, navigate to your Netdata directory (typically at `/etc/netdata/`) and use
-`edit-config` to initialize and edit your HDFS configuration file.
-
-```bash
-cd /etc/netdata/
-sudo ./edit-config go.d/hdfs.conf
-```
-
-At the bottom of the file, you will see two example jobs, both of which are commented out:
-
-```yaml
-# [ JOBS ]
-#jobs:
-#  - name: namenode
-#    url: http://127.0.0.1:9870/jmx
-#
-#  - name: datanode
-#    url: http://127.0.0.1:9864/jmx
-```
-
-Uncomment these lines and edit the `url` value(s) according to your setup. Now's the time to add any other configuration
-details, which you can find inside of the `hdfs.conf` file itself. Most production implementations will require TLS
-certificates.
-
-The result for a simple HDFS setup, running entirely on `localhost` and without certificate authentication, might look
-like this:
-
-```yaml
-# [ JOBS ]
-jobs:
-  - name: namenode
-    url: http://127.0.0.1:9870/jmx
-
-  - name: datanode
-    url: http://127.0.0.1:9864/jmx
-```
-
-At this point, Netdata should be configured to collect metrics from your HDFS servers. Let's move on to Zookeeper.
-
-Next, use `edit-config` again to initialize/edit your `zookeeper.conf` file.
-
-```bash
-cd /etc/netdata/
-sudo ./edit-config go.d/zookeeper.conf
-```
-
-As with the `hdfs.conf` file, head to the bottom, uncomment the example jobs, and tweak the `address` values according
-to your setup. Again, you may need to add additional configuration options, like TLS certificates.
-
-```yaml
-jobs:
-  - name    : local
-    address : 127.0.0.1:2181
-
-  - name    : remote
-    address : 203.0.113.10:2182
-```
-
-Finally, [restart Netdata](https://github.com/netdata/netdata/blob/master/packaging/installer/README.md#maintaining-a-netdata-agent-installation).
-
-```sh
-sudo systemctl restart netdata
-```
-
-Upon restart, Netdata should recognize your HDFS/Zookeeper servers, enable the HDFS and Zookeeper modules, and begin
-showing real-time metrics for both in your Netdata dashboard. 🎉
-
-## Configuring HDFS and Zookeeper alerts
-
-The Netdata community helped us create sane defaults for alerts related to both HDFS and Zookeeper. You may want to
-investigate these to ensure they work well with your Hadoop implementation.
-
--   [HDFS alerts](https://raw.githubusercontent.com/netdata/netdata/master/src/health/health.d/hdfs.conf)
-
-You can also access/edit these files directly with `edit-config`:
-
-```bash
-sudo /etc/netdata/edit-config health.d/hdfs.conf
-sudo /etc/netdata/edit-config health.d/zookeeper.conf
-```
-
-For more information about editing the defaults or writing new alert entities, see our 
-[health monitoring documentation](https://github.com/netdata/netdata/blob/master/src/health/README.md).