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Zhihong Yu commented on HBASE-5094: ----------------------------------- Ram is coming up with a new patch as the previous one didn't fix the problem. > The META can hold an entry for a region with a different server name from the > one actually in the AssignmentManager thus making the region inaccessible. > -------------------------------------------------------------------------------------------------------------------------------------------------------- > > Key: HBASE-5094 > URL: https://issues.apache.org/jira/browse/HBASE-5094 > Project: HBase > Issue Type: Bug > Affects Versions: 0.92.0 > Reporter: ramkrishna.s.vasudevan > Priority: Critical > > {code} > RegionState rit = > this.services.getAssignmentManager().isRegionInTransition(e.getKey()); > ServerName addressFromAM = this.services.getAssignmentManager() > .getRegionServerOfRegion(e.getKey()); > if (rit != null && !rit.isClosing() && !rit.isPendingClose()) { > // Skip regions that were in transition unless CLOSING or > // PENDING_CLOSE > LOG.info("Skip assigning region " + rit.toString()); > } else if (addressFromAM != null > && !addressFromAM.equals(this.serverName)) { > LOG.debug("Skip assigning region " > + e.getKey().getRegionNameAsString() > + " because it has been opened in " > + addressFromAM.getServerName()); > } > {code} > In ServerShutDownHandler we try to get the address in the AM. This address > is initially null because it is not yet updated after the region was opened > .i.e. the CAll back after node deletion is not yet done in the master side. > But removal from RIT is completed on the master side. So this will trigger a > new assignment. > So there is a small window between the online region is actually added in to > the online list and the ServerShutdownHandler where we check the existing > address in AM. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira