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https://issues.apache.org/jira/browse/HBASE-19710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16312248#comment-16312248
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Ted Yu commented on HBASE-19710:
--------------------------------
The build I used corresponded to this commit:
HBASE-19667 Get rid of MasterEnvironment#supportGroupCPs
The cluster has 13 nodes, running hadoop 3.
> hbase:namespace table was stuck in transition
> ---------------------------------------------
>
> Key: HBASE-19710
> URL: https://issues.apache.org/jira/browse/HBASE-19710
> Project: HBase
> Issue Type: Bug
> Reporter: Ted Yu
> Priority: Critical
>
> ITBLL with chaos monkey failed due to namespace table getting stuck in
> transition.
> From hbase-hbase-master-ctr-e137-1514896590304-3629-01-000006.hwx.site.log ,
> we can see that master closed namespace table on 000009:
> {code}
> 2018-01-04 17:24:35,067 DEBUG [main-EventThread] zookeeper.ZKWatcher:
> master:20000-0x160c222710c0028,
> quorum=ctr-e137-1514896590304-3629-01-000011.hwx.site:2181,ctr-e137-
> 1514896590304-3629-01-000014.hwx.site:2181,ctr-e137-1514896590304-3629-01-000009.hwx.site:2181,ctr-e137-1514896590304-3629-01-000006.hwx.site:2181,ctr-e137-1514896590304-3629-
>
> 01-000003.hwx.site:2181,ctr-e137-1514896590304-3629-01-000007.hwx.site:2181,ctr-e137-1514896590304-3629-01-000013.hwx.site:2181,ctr-e137-1514896590304-3629-01-000002.hwx.site:
>
> 2181,ctr-e137-1514896590304-3629-01-000012.hwx.site:2181,ctr-e137-1514896590304-3629-01-000008.hwx.site:2181,ctr-e137-1514896590304-3629-01-000010.hwx.site:2181,
> baseZNode=/ hbase-unsecure Received ZooKeeper Event,
> type=NodeChildrenChanged, state=SyncConnected, path=/hbase-unsecure/rs
> 2018-01-04 17:24:35,067 INFO [ProcExecWrkr-5] assignment.RegionStateStore:
> pid=643 updating hbase:meta
> row=hbase:namespace,,1515085217343.a95ed2d7434a43390fbec73abeeb9fd9.,
> regionState=CLOSING,
> regionLocation=ctr-e137-1514896590304-3629-01-000009.hwx.site,16020,1515086643872
> ...
> 2018-01-04 17:24:35,246 INFO [ProcExecWrkr-12]
> procedure.MasterProcedureScheduler: pid=647, ppid=642,
> state=RUNNABLE:REGION_TRANSITION_QUEUE; AssignProcedure table=hbase:
> namespace, region=a95ed2d7434a43390fbec73abeeb9fd9 hbase:namespace
> hbase:namespace,,1515085217343.a95ed2d7434a43390fbec73abeeb9fd9.
> 2018-01-04 17:25:17,041 DEBUG
> [ctr-e137-1514896590304-3629-01-000006:20000.masterManager]
> procedure2.ProcedureExecutor: Loading pid=641,
> state=WAITING:MOVE_REGION_ASSIGN; MoveRegionProcedure
> hri=hbase:namespace,,1515085217343.a95ed2d7434a43390fbec73abeeb9fd9.,
> source=ctr-e137-1514896590304-3629-01-000009.hwx.site,16020,1515086643872,
> destination=
> {code}
> For the move operation, from ctr-e137-1514896590304-3629-01-000009.hwx.site
> log:
> {code}
> 2018-01-04 17:24:34,855 DEBUG
> [RS_CLOSE_REGION-ctr-e137-1514896590304-3629-01-000009:16020-0]
> coprocessor.CoprocessorHost: Stop coprocessor
> org.apache.hadoop.hbase.security. access.SecureBulkLoadEndpoint
> 2018-01-04 17:24:34,855 INFO
> [RS_CLOSE_REGION-ctr-e137-1514896590304-3629-01-000009:16020-0]
> regionserver.HRegion: Closed hbase:namespace,,1515085217343.
> a95ed2d7434a43390fbec73abeeb9fd9.
> 2018-01-04 17:24:34,856 DEBUG
> [RS_CLOSE_REGION-ctr-e137-1514896590304-3629-01-000009:16020-0]
> handler.CloseRegionHandler: Closed hbase:namespace,,1515085217343.
> a95ed2d7434a43390fbec73abeeb9fd9.
> ...
> 2018-01-04 17:25:47,607 DEBUG
> [RpcServer.priority.FPBQ.Fifo.handler=18,queue=0,port=16020] ipc.RpcServer:
> callId: 16 service: ClientService methodName: Get size: 103
> connection: 172.27.13.80:36738 deadline: 1515086837568
> org.apache.hadoop.hbase.NotServingRegionException:
> hbase:namespace,,1515085217343.a95ed2d7434a43390fbec73abeeb9fd9. is not
> online on ctr-e137-1514896590304-3629-01-000009.hwx. site,16020,1515086719163
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.getRegionByEncodedName(HRegionServer.java:3312)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:3289)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices.getRegion(RSRpcServices.java:1354)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices.get(RSRpcServices.java:2360)
> at
> org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:41544)
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:403)
> {code}
> We can see that the region server was not serving the region.
> After that, the masters kept thinking namespace table was on 0009, leading to
> prolonged downtime.
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