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From "Abhishek Singh Chouhan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-17682) Region stuck in merging_new state indefinitely
Date Thu, 23 Feb 2017 12:37:44 GMT
Abhishek Singh Chouhan created HBASE-17682:

             Summary: Region stuck in merging_new state indefinitely
                 Key: HBASE-17682
                 URL: https://issues.apache.org/jira/browse/HBASE-17682
             Project: HBase
          Issue Type: Bug
    Affects Versions: 1.3.0
            Reporter: Abhishek Singh Chouhan
            Assignee: Abhishek Singh Chouhan

Ran into issue while tinkering around with a chaos monkey that did splits, merges and kills
exclusively, which resulted in regions getting stuck in transition in merging new state indefinitely
which i think happens when the rs is killed during the merge but before the ponr, in which
case the new regions state in master is merging new. When the rs dies at this point the master
executes RegionStates.serverOffline() for the rs which does
for (RegionState state : regionsInTransition.values()) {
        HRegionInfo hri = state.getRegion();
        if (assignedRegions.contains(hri)) {
          // Region is open on this region server, but in transition.
          // This region must be moving away from this server, or splitting/merging.
          // SSH will handle it, either skip assigning, or re-assign.
          LOG.info("Transitioning " + state + " will be handled by ServerCrashProcedure for
" + sn);
        } else if (sn.equals(state.getServerName())) {
          // Region is in transition on this region server, and this
          // region is not open on this server. So the region must be
          // moving to this server from another one (i.e. opening or
          // pending open on this server, was open on another one.
          // Offline state is also kind of pending open if the region is in
          // transition. The region could be in failed_close state too if we have
          // tried several times to open it while this region server is not reachable)
          if (state.isPendingOpenOrOpening() || state.isFailedClose() || state.isOffline())
            LOG.info("Found region in " + state +
              " to be reassigned by ServerCrashProcedure for " + sn);
          } else if(state.isSplittingNew()) {
          } else {
            LOG.warn("THIS SHOULD NOT HAPPEN: unexpected " + state);
We donot handle merging new here and end up with "THIS SHOULD NOT HAPPEN: unexpected ...".
Post this we have the new region which does not have any data stuck which leads to the balancer
not running.
I think we should handle mergingnew the same way as splittingnew. 

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