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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-3110) Improve the closeSession throughput in PrepRequestProcessor
Date Wed, 08 Aug 2018 07:23:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-3110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16572792#comment-16572792
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Hudson commented on ZOOKEEPER-3110:
-----------------------------------

SUCCESS: Integrated in Jenkins build ZooKeeper-trunk #143 (See [https://builds.apache.org/job/ZooKeeper-trunk/143/])
ZOOKEEPER-3110: Improve the closeSession throughput in (hanm: rev df2b3f4fd9944f0dd544b808ea3bad702534625d)
* (edit) src/java/main/org/apache/zookeeper/server/PrepRequestProcessor.java


> Improve the closeSession throughput in PrepRequestProcessor
> -----------------------------------------------------------
>
>                 Key: ZOOKEEPER-3110
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3110
>             Project: ZooKeeper
>          Issue Type: Improvement
>          Components: quorum
>            Reporter: Fangmin Lv
>            Assignee: Fangmin Lv
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 3.6.0, 3.5.5
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> On leader every expired global session will add 3 lines of logs, which is pretty heavy
and if the log file is more than a few GB, the log for the closeSession in PrepRequestProcessor
will slow down the whole ensemble's throughput. 
> From some use case, we found the prep request processor will be a bottleneck when there
are constantly high number of expired session or closing session explicitly.
> This JIra is going to remove one of the useless log when prepare close session txns,
which should give us higher throughput during processing large number of expire sessions.



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