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https://issues.apache.org/jira/browse/HBASE-20908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16550084#comment-16550084
]
Ted Yu commented on HBASE-20908:
--------------------------------
Failed test was not related to patch.
> Infinite loop on regionserver if region replica are reduced
> ------------------------------------------------------------
>
> Key: HBASE-20908
> URL: https://issues.apache.org/jira/browse/HBASE-20908
> Project: HBase
> Issue Type: Bug
> Components: read replicas
> Affects Versions: 1.2.0, 2.0.0
> Reporter: Ankit Singhal
> Assignee: Ankit Singhal
> Priority: Major
> Attachments: HBASE-20908.patch, HBASE-20908_v1.patch,
> HBASE-20908_v3.patch
>
>
> Steps to reproduce
> {code}
> hbase(main):003:0> create 'myTable','cf',{REGION_REPLICATION=>3}
> hbase(main):003:0> put 'myTable','r1','cf:col1','1'
> 0 row(s) in 0.1230 seconds
> hbase(main):004:0> disable 'myTable'
> alter '0 row(s) in 2.3040 seconds
> hbase(main):005:0> alter 'myTable',{REGION_REPLICATION=>1}
> Updating all regions with the new schema...
> 1/1 regions updated.
> Done.
> 0 row(s) in 11.9550 seconds
> hbase(main):006:0> enable 'myTable'
> 0 row(s) in 1.2620 seconds
> hbase(main):007:0> put 'myTable1','r2','cf:col1','1'
> 0 row(s) in 0.0060 seconds
> {code}
> This is the replica region request which will not be present now in Meta but
> was there in cache. Server will say that he is not serving this region.
> {code}
> com.google.protobuf.ServiceException:
> org.apache.hadoop.hbase.ipc.RemoteWithExtrasException(org.apache.hadoop.hbase.NotServingRegionException):
> org.apache.hadoop.hbase.NotServingRegionException: Region
> d997d9b47a106216b9b117617ec09015 is not online on
> 10.22.9.76,16020,1531341039091
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.getRegionByEncodedName(HRegionServer.java:3124)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.getRegionByEncodedName(HRegionServer.java:3106)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices.replay(RSRpcServices.java:1714)
> at
> org.apache.hadoop.hbase.protobuf.generated.AdminProtos$AdminService$2.callBlockingMethod(AdminProtos.java:22773)
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2150)
> at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:112)
> at
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:187)
> at
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:167)
> {code}
> Eventually, when we will update our cache after looking into meta , we will
> get into an infinite loop as this event will not be replicated because the
> location of the replica will not appear again.
> {code}
> java.net.SocketTimeoutException: callTimeout=1200000, callDuration=2181316:
> Can't get the location null
> at
> org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:170)
> at
> org.apache.hadoop.hbase.replication.regionserver.RegionReplicaReplicationEndpoint$RetryingRpcCallable.call(RegionReplicaReplicationEndpoint.java:606)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:748)
> Caused by: org.apache.hadoop.hbase.client.RetriesExhaustedException: Can't
> get the location
> at
> org.apache.hadoop.hbase.client.RegionAdminServiceCallable.getRegionLocations(RegionAdminServiceCallable.java:178)
> at
> org.apache.hadoop.hbase.client.RegionAdminServiceCallable.getLocation(RegionAdminServiceCallable.java:105)
> at
> org.apache.hadoop.hbase.client.RegionAdminServiceCallable.prepare(RegionAdminServiceCallable.java:89)
> at
> org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:134)
> ... 5 more
> Caused by: java.io.IOException: HRegionInfo was null in myTable,
> row=keyvalues={myTable,,1531262022075.f2b68622cfd5851023be29d5599db6c9./info:regioninfo/1531262022425/Put/vlen=41/seqid=0,
>
> myTable,,1531262022075.f2b68622cfd5851023be29d5599db6c9./info:seqnumDuringOpen/1531341209944/Put/vlen=8/seqid=0,
>
> myTable,,1531262022075.f2b68622cfd5851023be29d5599db6c9./info:server/1531341209944/Put/vlen=16/seqid=0,
>
> myTable,,1531262022075.f2b68622cfd5851023be29d5599db6c9./info:serverstartcode/1531341209944/Put/vlen=8/seqid=0}
> at
> org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegionInMeta(ConnectionManager.java:1289)
> at
> org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1179)
> at
> org.apache.hadoop.hbase.client.RegionAdminServiceCallable.getRegionLocations(RegionAdminServiceCallable.java:170)
> ... 8 more
> {code}
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