Add monitoring four-letter word
-------------------------------
Key: ZOOKEEPER-744
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-744
Project: Zookeeper
Issue Type: New Feature
Components: server
Reporter: Travis Crawford
Filing a feature request based on a zookeeper-user discussion.
Zookeeper should have a new four-letter word that returns key-value pairs
appropriate for importing to a monitoring system (such as Ganglia which has a
large installed base)
This command should initially export the following:
(a) Count of instances in the ensemble.
(b) Count of up-to-date instances in the ensemble.
But be designed such that in the future additional data can be added. For
example, the output could define the statistic in a comment, then print a key
"space character" value line:
"""
# Total number of instances in the ensemble
zk_ensemble_instances_total 5
# Number of instances currently participating in the quorum.
zk_ensemble_instances_active 4
"""
>From the mailing list:
"""
Date: Mon, 19 Apr 2010 12:10:44 -0700
From: Patrick Hunt <ph...@apache.org>
To: zookeeper-u...@hadoop.apache.org
Subject: Re: Recovery issue - how to debug?
On 04/19/2010 11:55 AM, Travis Crawford wrote:
> It would be a lot easier from the operations perspective if the leader
> explicitly published some health stats:
>
> (a) Count of instances in the ensemble.
> (b) Count of up-to-date instances in the ensemble.
>
> This would greatly simplify monitoring& alerting - when an instance
> falls behind one could configure their monitoring system to let
> someone know and take a look at the logs.
That's a great idea. Please enter a JIRA for this - a new 4 letter word
and JMX support. It would also be a great starter project for someone
interested in becoming more familiar with the server code.
Patrick
"""
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