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From "Maryann Xue (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-6169) When a RS aborts without finishing closing a region, this region will always remain "in transition".
Date Wed, 06 Jun 2012 07:42:24 GMT
Maryann Xue created HBASE-6169:
----------------------------------

             Summary: When a RS aborts without finishing closing a region, this region will
always remain "in transition".
                 Key: HBASE-6169
                 URL: https://issues.apache.org/jira/browse/HBASE-6169
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.94.0, 0.90.6
            Reporter: Maryann Xue


When RS got an ZK error when trying to create a "CLOSING" node in the process of closing a
region, it hence aborts without completing closing of the region.
RS is then discovered dead by HMaster. ServerShutdownHandler does not try to reassign this
region for it is in PENDING_CLOSE state; while all regions that originally belong to the dead
RS get removed from the "regions" map.
TimeoutMonitor then endlessly tries to "unassign" this region with LOG message "Region has
been PENDING_CLOSE for too long". The "unassign" returns without doing anything, for this
region does not exist in the "regions" map:
  public void unassign(HRegionInfo region, boolean force, ServerName dest) {
    // 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");
        return;
      }
    }
  ...

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