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From "Jon Bringhurst (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-1281) Stat and srvr 4 letter commands are useless on the leader when leaderServes = false
Date Mon, 18 Sep 2017 16:53:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-1281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16170283#comment-16170283

Jon Bringhurst commented on ZOOKEEPER-1281:

Is there a workaround for this that people are using when monitoring their Zookeeper ensemble?

We've been using Jolokia (http://jolokia.org) attached to the Zookeeper process with a Python
agent that hits the http endpoint, runs through the org.apache.ZooKeeperService mbeans, then
finally emits various metrics (including if the server is a participant, leader, or observer)
to our monitoring system. See https://zookeeper.apache.org/doc/r3.4.6/zookeeperJMX.html to
get a non-exhaustive list of what metrics you can get from Zookeeper's mbeans. This setup
has worked well for monitoring our 80+ Zookeeper clusters for several years now.

> Stat and srvr 4 letter commands are useless on the leader when leaderServes = false
> -----------------------------------------------------------------------------------
>                 Key: ZOOKEEPER-1281
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1281
>             Project: ZooKeeper
>          Issue Type: Improvement
>          Components: server
>    Affects Versions: 3.3.3
>            Reporter: Daniel Lord
> When leaderServes = false the leader responds to the stat/srvr  letter words with simply
"this ZooKeeper instance is not currently serving requests".  While I agree that is an accurate
statement it's not terribly useful for monitoring programs.  Additionally, if members of the
ensemble are not currently in the quorum it becomes impossible to tell who is out of the quorum
and who is the leader of the quorum.
> I'm not sure if the leader should have a specially formatted response for stat/srvr or
if it should simply display less information (no connections for example).

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