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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4246) Cluster with too many regions cannot withstand some master failover scenarios
Date Thu, 17 Jan 2013 03:16:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13555786#comment-13555786
] 

Hudson commented on HBASE-4246:
-------------------------------

Integrated in HBase-TRUNK-on-Hadoop-2.0.0 #351 (See [https://builds.apache.org/job/HBase-TRUNK-on-Hadoop-2.0.0/351/])
    Add to troubleshooting a note on zk buffer size issue when lots of regions -- hbase-4246
(Revision 1434087)

     Result = FAILURE
                
> Cluster with too many regions cannot withstand some master failover scenarios
> -----------------------------------------------------------------------------
>
>                 Key: HBASE-4246
>                 URL: https://issues.apache.org/jira/browse/HBASE-4246
>             Project: HBase
>          Issue Type: Bug
>          Components: master, Zookeeper
>    Affects Versions: 0.90.4
>            Reporter: Todd Lipcon
>             Fix For: 0.96.0
>
>
> We ran into the following sequence of events:
> - master startup failed after only ROOT had been assigned (for another reason)
> - restarted the master without restarting other servers. Since there was at least one
region assigned, it went through the failover code path
> - master scanned META and inserted every region into /hbase/unassigned in ZK.
> - then, it called "listChildren" on the /hbase/unassigned znode, and crashed with "Packet
len6080218 is out of range!" since the IPC response was larger than the default maximum.

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