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From "Jean-Daniel Cryans (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 14:31:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12728122#action_12728122

Jean-Daniel Cryans commented on HBASE-1614:

It is important to remind that the ZK doc is very clear that a ZK server should have its own
disk and even its own machine. I bet that people put the ZK servers on the same machines as
the RS servers which is a cheap way to make it work but not really a good way. So a single
ZK instance on the same node as a RS/TT/DN is probably the worst setup ever.

> 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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