Zookeeper

• Setup
• Prerequisites
• Configuration
• Metrics
• Tags

ZooKeeper is a distributed, open-source coordination service for distributed applications. It exposes a simple set of primitives that distributed applications can build upon to implement higher level services for synchronization, configuration maintenance, and groups and naming.

This is a fork of the Telegraf ZooKeeper plugin.

Setup

The zookeeper plugin is included with the SolarWinds Snap Agent by default. Follow the directions below to enable it for a agent instance.

Prerequisites

You will need to install and run ZooKeeper.

Configuration

The agent provides an example configuration file to help you get started quickly. It defines the plugin and task file to be loaded by the agent, but requires you to provide the correct settings for your ZooKeeper installation. To enable the plugin:

1. Make a copy of the ZooKeeper example configuration file /opt/SolarWinds/Snap/etc/plugins.d/zookeeper.yaml.example, renaming it to /opt/SolarWinds/Snap/etc/plugins.d/zookeeper.yaml:

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$ sudo cp /opt/SolarWinds/Snap/etc/plugins.d/zookeeper.yaml.example /opt/SolarWinds/Snap/etc/plugins.d/zookeeper.yaml

2. Edit the configuration file with settings specific to your ZooKeeper configuration:

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$ sudo nano /opt/SolarWinds/Snap/etc/plugins.d/zookeeper.yaml

In this configuration you'll notice that it is already configured to listen on localhost:2181:

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collector:
  # Reads 'mntr' stats from one or many zookeeper servers
  zookeeper:
    all:
      ## An array of address to gather stats about. Specify an ip or hostname
      ## with port. ie localhost:2181, 10.0.0.1:2181, etc.
      ## If no servers are specified, then localhost is used as the host.
      ## If no port is specified, 2181 is used
      # servers: "10.0.0.1:2181,10.0.0.2:2181,10.0.0.3:2181"
      # servers: ":2181"
load:
  plugin: snap-plugin-collector-bridge-zookeeper
  task: task-bridge-zookeeper.yaml

If running on a remote server you will need to add the line servers: "0.0.0.0:2181" to your configuration. If ZooKeeper is running on another hostname or port then you will need to edit the configuration to reflect this.

Save your changes and return to the command prompt.

3. Restart the agent after any configuration changes have been made:

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$ sudo service swisnapd restart

4. Enable the ZooKeeper plugin

On the Integrations Page you will see ZooKeeper available if the previous steps were successful. It may take a couple minutes before the ZooKeeper plugin is identified.

Select the ZooKeeper plugin to open the configuration menu in the UI, and enable the plugin. If you do not see the plugin, see Troubleshooting Linux.

Metrics

The table below outlines the default set of metrics collected by the ZooKeeper plugin.

Namespace	Description
zookeeper.approximate_data_size	Size of data in bytes that a zookeeper server has in its data tree
zookeeper.avg_latency	Average time in milliseconds for requests to be processed
zookeeper.ephemerals_count	Number of ephemeral nodes that a zookeeper server has in its data tree
zookeeper.max_file_descriptor_count	Maximum number of file descriptors that a zookeeper server can open
zookeeper.max_latency	Maximum time in milliseconds for a request to be processed
zookeeper.min_latency	Minimum time in milliseconds for a request to be processed
zookeeper.num_alive_connections	Number of active clients connected to a zookeeper server
zookeeper.open_file_descriptor_count	Number of file descriptors that a zookeeper server has open
zookeeper.outstanding_requests	Number of currently executing requests
zookeeper.packets_received	Count of the number of zookeeper packets received by a server
zookeeper.packets_sent	Count of the number of zookeeper packets sent from a server
zookeeper.watch_count	Number of watches placed on z-nodes on a zookeeper server
zookeeper.znode_count	Number of z-nodes that a zookeeper server has in its data tree

Tags

The table below outlines the default set of tags provided for each metric.

Tags	Description
@host	The hostname of the ZooKeeper server
port	The port used by the ZooKeeper server
state	The current ZooKeeper configuration (Standalone or Distributed mode)

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