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From "gaojinchao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4124) ZK restarted while a region is being assigned, new active HM re-assigns it but the RS warns 'already online on this server'.
Date Fri, 26 Aug 2011 00:55:29 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13091474#comment-13091474
] 

gaojinchao commented on HBASE-4124:
-----------------------------------

@ Ted
I am making a patch for TRUNK. But I have some questions about TRUNK.
It seems a bug.
In function assign, when we get the return value "ALREADY_OPENED" .
should we update the meta table ?  or we do this on region server.

hmaster code:
  RegionOpeningState regionOpenState = serverManager.sendRegionOpen(plan
            .getDestination(), state.getRegion());
        if (regionOpenState == RegionOpeningState.ALREADY_OPENED) {

region server code: if we don't update the meta ,the client may access to the old server.

 HRegion onlineRegion = this.getFromOnlineRegions(region.getEncodedName());
    if (null != onlineRegion) {
      LOG.warn("Attempted open of " + region.getEncodedName()
          + " but already online on this server");
      return RegionOpeningState.ALREADY_OPENED;
    }

> ZK restarted while a region is being assigned, new active HM re-assigns it but the RS
warns 'already online on this server'.
> ----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-4124
>                 URL: https://issues.apache.org/jira/browse/HBASE-4124
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>            Reporter: fulin wang
>            Assignee: gaojinchao
>             Fix For: 0.90.5
>
>         Attachments: HBASE-4124_Branch90V1_trial.patch, HBASE-4124_Branch90V2.patch,
HBASE-4124_Branch90V3.patch, HBASE-4124_Branch90V4.patch, log.txt
>
>   Original Estimate: 0.4h
>  Remaining Estimate: 0.4h
>
> ZK restarted while assigning a region, new active HM re-assign it but the RS warned 'already
online on this server'.
> Issue:
> The RS failed besause of 'already online on this server' and return; The HM can not receive
the message and report 'Regions in transition timed out'.

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