[HBASE-17572] HMaster: Caught throwable while processing event C_M_MERGE_REGION

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.3.0
• Fix Version/s: 1.3.1
• Hadoop Flags: Reviewed
• Assignee: Andrew Kyle Purtell
• Reporter: Andrew Kyle Purtell
• Created: 31/Jan/17 19:02
• Updated: 09/Nov/17 02:39
• Resolved: 09/Feb/17 21:50

Description

Running ITBLL 1B rows against branch-1.3 compiled against Hadoop 2.7.3 with the noKill monkey policy, I see both masters go down with

master.HMaster: Caught throwable while processing event C_M_MERGE_REGION
java.lang.reflect.UndeclaredThrowableException

In ServerManager#sendRegionsMerge we call ProtobufUtil#mergeRegions, which does a doAs, and the code within that block invokes RSRpcServices#mergeRegions, but is not resilient against RegionOpeningException ("region is opening")

An UndeclaredThrowableException is "thrown by a method invocation on a proxy instance if its invocation handler's invoke method throws a checked exception (a Throwable that is not assignable to RuntimeException or Error) that is not assignable to any of the exception types declared in the throws clause of the method that was invoked on the proxy instance and dispatched to the invocation handler." (http://docs.oracle.com/javase/7/docs/api/java/lang/reflect/UndeclaredThrowableException.html)

2017-01-31 07:21:17,495 FATAL [MASTER_TABLE_OPERATIONS-node-1:16000-0] master.HMaster: Caught throwable while processing event C_M_MERGE_REGION
java.lang.reflect.UndeclaredThrowableException
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1737)
        at org.apache.hadoop.hbase.protobuf.ProtobufUtil.mergeRegions(ProtobufUtil.java:1990)
        at org.apache.hadoop.hbase.master.ServerManager.sendRegionsMerge(ServerManager.java:925)
        at org.apache.hadoop.hbase.master.handler.DispatchMergingRegionHandler.process(DispatchMergingRegionHandler.java:153)
        at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:129)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: com.google.protobuf.ServiceException: org.apache.hadoop.hbase.ipc.RemoteWithExtrasException(org.apache.hadoop.hbase.exceptions.RegionOpeningException): org.apache.hadoop.hbase.exceptions.RegionOpeningException: Region IntegrationTestBigLinkedList,|\xFFnk\x1C\x85<[\x1Ef\xFDE\xF9\xAA\xAC\x08,1485846598043.f56ad22121e872777468020c4452a7c7. is opening on node-2.cluster,16020,1485822382322
        at org.apache.hadoop.hbase.regionserver.HRegionServer.getRegionByEncodedName(HRegionServer.java:2964)
        at org.apache.hadoop.hbase.regionserver.RSRpcServices.getRegion(RSRpcServices.java:1139)
        at org.apache.hadoop.hbase.regionserver.RSRpcServices.mergeRegions(RSRpcServices.java:1497)
        at org.apache.hadoop.hbase.protobuf.generated.AdminProtos$AdminService$2.callBlockingMethod(AdminProtos.java:22749)
        at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2355)
        at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:123)
        at org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:188)
        at org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:168)

        at org.apache.hadoop.hbase.ipc.AbstractRpcClient.callBlockingMethod(AbstractRpcClient.java:244)
        at org.apache.hadoop.hbase.ipc.AbstractRpcClient$BlockingRpcChannelImplementation.callBlockingMethod(AbstractRpcClient.java:340)
        at org.apache.hadoop.hbase.protobuf.generated.AdminProtos$AdminService$BlockingStub.mergeRegions(AdminProtos.java:23695)
        at org.apache.hadoop.hbase.protobuf.ProtobufUtil$1.run(ProtobufUtil.java:1993)
        at org.apache.hadoop.hbase.protobuf.ProtobufUtil$1.run(ProtobufUtil.java:1990)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1719)
        ... 7 more
Caused by: org.apache.hadoop.hbase.ipc.RemoteWithExtrasException(org.apache.hadoop.hbase.exceptions.RegionOpeningException): org.apache.hadoop.hbase.exceptions.RegionOpeningException: Region IntegrationTestBigLinkedList,|\xFFnk\x1C\x85<[\x1Ef\xFDE\xF9\xAA\xAC\x08,1485846598043.f56ad22121e872777468020c4452a7c7. is opening on node-2.cluster,16020,1485822382322
        at org.apache.hadoop.hbase.regionserver.HRegionServer.getRegionByEncodedName(HRegionServer.java:2964)
        at org.apache.hadoop.hbase.regionserver.RSRpcServices.getRegion(RSRpcServices.java:1139)
        at org.apache.hadoop.hbase.regionserver.RSRpcServices.mergeRegions(RSRpcServices.java:1497)
        at org.apache.hadoop.hbase.protobuf.generated.AdminProtos$AdminService$2.callBlockingMethod(AdminProtos.java:22749)
        at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2355)
        at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:123)
        at org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:188)
        at org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:168)

        at org.apache.hadoop.hbase.ipc.RpcClientImpl.call(RpcClientImpl.java:1286)
        at org.apache.hadoop.hbase.ipc.AbstractRpcClient.callBlockingMethod(AbstractRpcClient.java:231)
        ... 14 more