[jira] [Commented] (ZOOKEEPER-1516) Configurable finalizeWait for FastLeaderElection

["Flavio Junqueira (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-1516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13421336#comment-13421336 ] 

Flavio Junqueira commented on ZOOKEEPER-1516:
---------------------------------------------

If you reduce that value, you increase the probability of the algorithm not converging. You'll make your deployment unstable. Given that leader election shouldn't be a common event, 200ms seems pretty acceptable to me in general and I don't recommend allowing administrators to calibrate that value.
                
> Configurable finalizeWait for FastLeaderElection
> ------------------------------------------------
>
>                 Key: ZOOKEEPER-1516
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1516
>             Project: ZooKeeper
>          Issue Type: Improvement
>          Components: leaderElection, quorum, server
>    Affects Versions: 3.3.5
>         Environment: Gentoo linux, any environment is affected.
>            Reporter: Ian Babrou
>              Labels: performance
>
> FastLeaderElection has final static int finalizeWait = 200. This is time to wait after successful leader election. I don't know what could happen, but 200ms is too slow for production environment under heavy load.
> I changed it to 20ms and everything still works for me.
> I propose to make this value configurable with default value of 200 to not affect current installations.
> Combined with #ZOOKEEPER-1515 it could improve leader election and make it 10x times faster: 1500ms -> 180ms including 100ms for 2 faileed new leader connections.

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