zookeeper-monitoring

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Tools and Recipes for ZooKeeper Monitoring

UPDATE: This repository have been committed [1] to the ZooKeeper trunk as a contrib. You can find it under src/contrib/monitoring. Please use the ZooKeeper JIRA [2] to submit issues and feature requests. It's going to be a part of the upcoming 3.4.0 release. Thanks.

[1] https://issues.apache.org/jira/browse/ZOOKEEPER-799 [2] https://issues.apache.org/jira/browse/ZOOKEEPER

How To Monitor

A ZooKeeper cluster can be monitored in two ways:

1. by using the 'mntr' 4letterword command
2. by using JMX to query the MBeans

This repo contains tools and recipes for monitoring ZooKeeper using the first method.

Check the file JMX-RESOURCE for some links to resources that could help you monitor a ZooKeeper cluster using the JMX interface.

Requirements

ZooKeeper 3.4.0 or later or you can apply ZOOKEEPER-744 patch over the latest 3.3.x release. The server should understand the 'mntr' 4letterword command.

$ echo 'mntr' | nc localhost 2181 zk_version 3.4.0--1, built on 06/19/2010 15:07 GMT zk_avg_latency 141 zk_max_latency 1788 zk_min_latency 0 zk_packets_received 385466 zk_packets_sent 435364 zk_outstanding_requests 0 zk_server_state follower zk_znode_count 5 zk_watch_count 0 zk_ephemerals_count 0 zk_approximate_data_size 41 zk_open_file_descriptor_count 20 zk_max_file_descriptor_count 1024

Python 2.6 (maybe it works on previous version but it's not tested yet).

In a nutshell

All you need is check_zookeeper.py It has no external dependencies.

*** On Nagios call the script like this:

./check_zookeeper.py -o nagios -s "" -k -w -c

*** On Cacti define a custom data input method using the script like this:

./check_zookeeper.py -o cacti -s "" -k --leader

-- outputs a single value for the given key fetched from the cluster leader

OR

./check_zookeeper.py -o cacti -s "" -k

-- outputs multiple values on for each cluster node ex: localhost_2182:0 localhost_2183:0 localhost_2181:0 localhost_2184:0 localhost_2185:0

*** On Ganglia:

install the plugin found in the ganglia/ subfolder OR

./check_zookeeper.py -o ganglia -s ""

it will use gmetric to send zookeeper node status data.

Check the subfolders for configuration details and samples for each platform.

ZooKeeper 4letterwords Commands

http://hadoop.apache.org/zookeeper/docs/current/zookeeperAdmin.html#sc_zkCommands