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From "Jieshan Bean (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5927) AM#unassign should handle local exceptions after calling sendRegionClose
Date Thu, 03 May 2012 15:58:55 GMT
Jieshan Bean created HBASE-5927:

             Summary: AM#unassign should handle local exceptions after calling sendRegionClose
                 Key: HBASE-5927
                 URL: https://issues.apache.org/jira/browse/HBASE-5927
             Project: HBase
          Issue Type: Bug
          Components: master
    Affects Versions: 0.92.1, 0.96.0, 0.94.1
            Reporter: Jieshan Bean
            Assignee: Jieshan Bean
             Fix For: 0.92.2, 0.96.0, 0.94.1

A possible exception: If the related regionserver was just killed(But HMaster has not perceived
that), then we will get a local exception "Connection reset by peer". If this region belongs
to a disabling table. what will happen?

ServerShutdownHandler will remove this region from AM#regions. So this region is still existing
in RIT. TimeoutMonitor will take care of it after it got timeout. Then invoke unassign again.
But it has been removed from AM#regions, so it will return directly due to the below code:

  public void unassign(HRegionInfo region, boolean force) {
    // TODO: Method needs refactoring.  Ugly buried returns throughout.  Beware!
    LOG.debug("Starting unassignment of region " +
      region.getRegionNameAsString() + " (offlining)");

    synchronized (this.regions) {
      // Check if this region is currently assigned
      if (!regions.containsKey(region)) {
        LOG.debug("Attempted to unassign region " +
          region.getRegionNameAsString() + " but it is not " +
          "currently assigned anywhere");

Then it leads to an end-less loop.

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