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From "Matteo Bertozzi (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5666) RegionServer doesn't retry to check if base node is available
Date Tue, 03 Apr 2012 21:16:28 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13245759#comment-13245759
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Matteo Bertozzi commented on HBASE-5666:
----------------------------------------

The problem that I see with the patch v4 and the if (timeout == 0) special case is that exists()
is different for ZooKeeper and RecoverableZookeeper.

RecoverableZookeeper has some internal retry logic for CONNECTIONLOSS, SESSIONEXPIRED, and
OPERATIONTIMEOUT, to keep the code simple we can add this logic in ZKUtil.checkExist() in
this way we can remove the special case, and remove the code in RecoverabeZK.
                
> RegionServer doesn't retry to check if base node is available
> -------------------------------------------------------------
>
>                 Key: HBASE-5666
>                 URL: https://issues.apache.org/jira/browse/HBASE-5666
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver, zookeeper
>            Reporter: Matteo Bertozzi
>            Assignee: Matteo Bertozzi
>         Attachments: HBASE-5666-v1.patch, HBASE-5666-v2.patch, HBASE-5666-v3.patch, HBASE-5666-v4.patch,
hbase-1-regionserver.log, hbase-2-regionserver.log, hbase-3-regionserver.log, hbase-master.log,
hbase-regionserver.log, hbase-zookeeper.log
>
>
> I've a script that starts hbase and a couple of region servers in distributed mode (hbase.cluster.distributed
= true)
> {code}
> $HBASE_HOME/bin/start-hbase.sh
> $HBASE_HOME/bin/local-regionservers.sh start 1 2 3
> {code}
> but the region servers are not able to start...
> It seems that during the RS start the the znode is still not available, and HRegionServer.initializeZooKeeper()
check just once if the base not is available.
> {code}
> 2012-03-28 21:54:05,013 INFO org.apache.hadoop.hbase.regionserver.HRegionServer: STOPPED:
Check the value configured in 'zookeeper.znode.parent'. There could be a mismatch with the
one configured in the master.
> 2012-03-28 21:54:08,598 FATAL org.apache.hadoop.hbase.regionserver.HRegionServer: ABORTING
region server localhost,60202,1332964444824: Initialization of RS failed.  Hence aborting
RS.
> java.io.IOException: Received the shutdown message while waiting.
> 	at org.apache.hadoop.hbase.regionserver.HRegionServer.blockAndCheckIfStopped(HRegionServer.java:626)
> 	at org.apache.hadoop.hbase.regionserver.HRegionServer.initializeZooKeeper(HRegionServer.java:596)
> 	at org.apache.hadoop.hbase.regionserver.HRegionServer.preRegistrationInitialization(HRegionServer.java:558)
> 	at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:672)
> 	at java.lang.Thread.run(Thread.java:662)
> {code}

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