@Override
    public ReportRegionStateTransitionResponse reportRegionStateTransition(RpcController c,
      ReportRegionStateTransitionRequest req) throws ServiceException {
      ReportRegionStateTransitionResponse resp = super.reportRegionStateTransition(c, req);
      if (
        enabled.get()
          && req.getTransition(0).getTransitionCode().equals(TransitionCode.READY_TO_SPLIT)
          && !resp.hasErrorMessage()
      ) {
        RegionStates regionStates = myMaster.getAssignmentManager().getRegionStates();
        for (RegionStateNode regionState : regionStates.getRegionsInTransition()) {
          /*
           * TODO!!!! // Find the merging_new region and remove it if (regionState.isSplittingNew())
           * { regionStates.deleteRegion(regionState.getRegion()); }
           */
        }
      }
      return resp;
    }
Find regionserver other than the one passed. Can't rely on indexes into list of regionservers
since crashed servers occupy an index.
@return A regionserver that is not <code>notThisOne</code> or null if none found
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestSplitTransactionOnCluster.java