[HBASE-5927] SSH and DisableTableHandler happening together does not clear the znode of the region and RIT map.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.92.1, 0.94.1, 0.95.2
• Fix Version/s: 0.94.1, 0.95.0
• Component/s: master
• Hadoop Flags: Reviewed
• Assignee: rajeshbabu
• Reporter: Jieshan Bean
• Created: 03/May/12 15:58
• Updated: 26/Feb/13 08:15
• Resolved: 22/May/12 09:15

Description

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. Since this region has been removed from AM#regions, it will return directly due to the below code:

    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;
      }
    }

Then it leads to an end-less loop.