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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1614) single zk node buckling under small node? connections never timing out?
Date Tue, 07 Jul 2009 15:36:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12728152#action_12728152
] 

stack commented on HBASE-1614:
------------------------------

Understood.  But unless I'm missing something, the zk node is doing close to nothing but idle.
 If its zk writing logs that is causing it to go missing, it would be good to know that is
the case.

I'd be interested in learning tools to interogate zk instance -- see if its releasing connections
and how many its hosting at any one time and if its stuck log writing to a disk that is being
hogged by other processes.

> single zk node buckling under small node?  connections never timing out?
> ------------------------------------------------------------------------
>
>                 Key: HBASE-1614
>                 URL: https://issues.apache.org/jira/browse/HBASE-1614
>             Project: Hadoop HBase
>          Issue Type: Bug
>            Reporter: stack
>             Fix For: 0.20.0
>
>
> A few (Irfan on the list and jgray) report that a single node zk seems insufficient supporting
small cluster < 20 nodes.  This seems odd (though, yeah, we're recommending serious deploys
must have a quorum of >= 3 zk nodes).  Also, reports that all connections fill up and don't
time out though job is done (on IRC).  Take a look.
> (Check zk stat to see if it'll dump connections)

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