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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8785) revise zookeeper session timeout setting
Date Sat, 22 Jun 2013 03:11:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13691026#comment-13691026
] 

stack commented on HBASE-8785:
------------------------------

Looking in zk src, I see this in 3.4.5:

{code}
src//java/main/org/apache/zookeeper/server/quorum/QuorumPeer.java:        return maxSessionTimeout
== -1 ? tickTime * 20 : maxSessionTimeout;
{code}

If maxSessionTimeout is defined, it is what is used (Some context: http://mail-archives.apache.org/mod_mbox/zookeeper-dev/201109.mbox/%3CD3645B5B06A24B1195F6CF9041EF38AC@china.huawei.com%3E)

Regards 40s, yeah, it is a long time but what JD says.  It used to be 180s in 0.94 and was
made 90s in trunk.

                
> revise zookeeper session timeout setting
> ----------------------------------------
>
>                 Key: HBASE-8785
>                 URL: https://issues.apache.org/jira/browse/HBASE-8785
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.95.1
>            Reporter: Sergey Shelukhin
>             Fix For: 0.95.2
>
>
> Current ZK session timeout is set to 90sec., and the comment in the doc says: "This setting
becomes zookeeper's 'maxSessionTimeout'". However, this comment is misleading - it doesn't
always become maxSessionTimeout, min(our timeout, maxSessionTimeout) is chosen. Moreover,
the default maxSessionTimeout in ZK that I'm looking at is 40s, so this setting doesn't do
anything.
> Additionally, 40s. seems like a lot of time.
> 1) Should the comment be changed to tell the user to change ZK config if they want higher
timeout?
> 2) Should the setting be revised down?

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