[HBASE-8353] -ROOT-/.META. regions are hanging if master restarted while closing -ROOT-/.META. regions on dead RS

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 0.94.6
• Component/s: Region Assignment
• Assignee: Unassigned
• Reporter: rajeshbabu
• Created: 16/Apr/13 16:21
• Updated: 16/Jun/22 06:00
• Resolved: 20/Oct/13 21:04

Description

ROOT/META are not getting assigned if master restarted while closing ROOT/META.
Lets suppose catalog table regions in M_ZK_REGION_CLOSING state during master initialization and then just we are adding the them to RIT and waiting for TM.

        if (isOnDeadServer(regionInfo, deadServers) &&
            (data.getOrigin() == null || !serverManager.isServerOnline(data.getOrigin()))) {
          // If was on dead server, its closed now. Force to OFFLINE and this
          // will get it reassigned if appropriate
          forceOffline(regionInfo, data);
        } else {
          // Just insert region into RIT.
          // If this never updates the timeout will trigger new assignment
          regionsInTransition.put(encodedRegionName, new RegionState(
            regionInfo, RegionState.State.CLOSING,
            data.getStamp(), data.getOrigin()));
        }

isOnDeadServer always return false to ROOT/META because deadServers is null.

Even TM cannot close them properly because its not available in online regions since its not yet assigned.

    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;
      }
    }