Elliott Clark created HBASE-14555:
-------------------------------------

             Summary: Deadlock in MVCC branch-1.2
                 Key: HBASE-14555
                 URL: https://issues.apache.org/jira/browse/HBASE-14555
             Project: HBase
          Issue Type: Bug
            Reporter: Elliott Clark
            Priority: Critical


Just saw this in an IT test.

{code}
Thread 75 (PriorityRpcServer.handler=3,queue=1,port=16020):
  State: BLOCKED
  Blocked count: 691635
  Waited count: 1557446
  Blocked on java.util.LinkedList@32b53d9e
  Blocked by 81 (PriorityRpcServer.handler=9,queue=1,port=16020)
  Stack:
    
org.apache.hadoop.hbase.regionserver.MultiVersionConcurrencyControl.toString(MultiVersionConcurrencyControl.java:234)
    java.lang.String.valueOf(String.java:2994)
    java.lang.StringBuilder.append(StringBuilder.java:131)
    
org.apache.hadoop.hbase.regionserver.MultiVersionConcurrencyControl.waitForRead(MultiVersionConcurrencyControl.java:209)
    
org.apache.hadoop.hbase.regionserver.MultiVersionConcurrencyControl.completeAndWait(MultiVersionConcurrencyControl.java:144)
    
org.apache.hadoop.hbase.regionserver.HRegion.doMiniBatchMutation(HRegion.java:3191)
    org.apache.hadoop.hbase.regionserver.HRegion.batchMutate(HRegion.java:2837)
    org.apache.hadoop.hbase.regionserver.HRegion.batchMutate(HRegion.java:2779)
    
org.apache.hadoop.hbase.regionserver.RSRpcServices.doBatchOp(RSRpcServices.java:697)
    
org.apache.hadoop.hbase.regionserver.RSRpcServices.doNonAtomicRegionMutation(RSRpcServices.java:659)
    
org.apache.hadoop.hbase.regionserver.RSRpcServices.multi(RSRpcServices.java:2047)
    
org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:32594)
    org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2120)
    org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:106)
    org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:130)
    org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:107)
    java.lang.Thread.run(Thread.java:745)








Thread 81 (PriorityRpcServer.handler=9,queue=1,port=16020):
  State: BLOCKED
  Blocked count: 691858
  Waited count: 1558138
  Blocked on java.lang.Object@2a5e9ae8
  Blocked by 75 (PriorityRpcServer.handler=3,queue=1,port=16020)
  Stack:
    
org.apache.hadoop.hbase.regionserver.MultiVersionConcurrencyControl.complete(MultiVersionConcurrencyControl.java:191)
    
org.apache.hadoop.hbase.regionserver.MultiVersionConcurrencyControl.completeAndWait(MultiVersionConcurrencyControl.java:143)
    
org.apache.hadoop.hbase.regionserver.HRegion.doMiniBatchMutation(HRegion.java:3191)
    org.apache.hadoop.hbase.regionserver.HRegion.batchMutate(HRegion.java:2837)
    org.apache.hadoop.hbase.regionserver.HRegion.batchMutate(HRegion.java:2779)
    
org.apache.hadoop.hbase.regionserver.RSRpcServices.doBatchOp(RSRpcServices.java:697)
    
org.apache.hadoop.hbase.regionserver.RSRpcServices.doNonAtomicRegionMutation(RSRpcServices.java:659)
    
org.apache.hadoop.hbase.regionserver.RSRpcServices.multi(RSRpcServices.java:2047)
    
org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:32594)
    org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2120)
    org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:106)
    org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:130)
    org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:107)
    java.lang.Thread.run(Thread.java:745)
Thread 80 (PriorityRpcServer.handler=8,queue=0,port=16020):

{code}



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