[jira] [Created] (HBASE-19813) clone_snapshot fails with region failing to open when RS group feature is enabled

["Ted Yu (JIRA)" <ji...@apache.org>]

Ted Yu created HBASE-19813:
------------------------------

             Summary: clone_snapshot fails with region failing to open when RS group feature is enabled
                 Key: HBASE-19813
                 URL: https://issues.apache.org/jira/browse/HBASE-19813
             Project: HBase
          Issue Type: Bug
         Environment: The following scenario came from support case.
In cluster 1, create RS group rsg. Move table to rsg group.
Take snapshot of the table and copy the snapshot to cluster 2 where there is no group called rsg.
Cloning snapshot to table new_t4 on cluster 2 fails :
{code}
2018-01-09 11:45:30,468 INFO  [RestoreSnapshot-pool68-t1] regionserver.HRegion: Closed new_t4,,1514454789243.a6173d2955182ac5bde208301681c6af.
2018-01-09 11:45:30,468 INFO  [MASTER_TABLE_OPERATIONS-shubh1-1:16000-0] snapshot.CloneSnapshotHandler: Clone snapshot=snap_t3 on table=new_t4 completed!
2018-01-09 11:45:30,492 INFO  [MASTER_TABLE_OPERATIONS-shubh1-1:16000-0] hbase.MetaTableAccessor: Added 1
2018-01-09 11:45:30,492 WARN  [MASTER_TABLE_OPERATIONS-shubh1-1:16000-0] rsgroup.RSGroupBasedLoadBalancer: Group for table new_t4 is null
2018-01-09 11:45:30,492 DEBUG [MASTER_TABLE_OPERATIONS-shubh1-1:16000-0] rsgroup.RSGroupBasedLoadBalancer: Group Information found to be null. Some regions might be unassigned.
2018-01-09 11:45:30,492 WARN  [MASTER_TABLE_OPERATIONS-shubh1-1:16000-0] master.RegionStates: Failed to open/close a6173d2955182ac5bde208301681c6af on null, set to FAILED_OPEN
{code}
Here is related code from RSGroupBasedLoadBalancer:
{code}
        List<ServerName> candidateList = filterOfflineServers(info, servers);
        for (RegionInfo region : regionList) {
          currentAssignmentMap.put(region, regions.get(region));
        }
        if(candidateList.size() > 0) {
          assignments.putAll(this.internalBalancer.retainAssignment(
              currentAssignmentMap, candidateList));
{code}
candidateList is empty for table new_t4, leaving region for the table in FAILED_OPEN state.
            Reporter: Ted Yu






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