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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-12904) LLAP: deadlock in task scheduling
Date Thu, 21 Jan 2016 19:45:39 GMT
Sergey Shelukhin created HIVE-12904:
---------------------------------------

             Summary: LLAP: deadlock in task scheduling
                 Key: HIVE-12904
                 URL: https://issues.apache.org/jira/browse/HIVE-12904
             Project: Hive
          Issue Type: Bug
            Reporter: Hui Zheng


{noformat}
Thread 34107: (state = BLOCKED)
 - org.apache.hadoop.hive.llap.daemon.impl.TaskExecutorService$TaskWrapper.isInWaitQueue()
@bci=0, line=690 (Compiled frame)
 - org.apache.hadoop.hive.llap.daemon.impl.TaskExecutorService.finishableStateUpdated(org.apache.hadoop.hive.llap.daemon.impl.TaskExecutorService$TaskWrapper,
boolean) @bci=8, line=485 (Compiled frame)
 - org.apache.hadoop.hive.llap.daemon.impl.TaskExecutorService.access$1500(org.apache.hadoop.hive.llap.daemon.impl.TaskExecutorService,
org.apache.hadoop.hive.llap.daemon.impl.TaskExecutorService$TaskWrapper, boolean) @bci=3,
line=78 (Compiled frame)
 - org.apache.hadoop.hive.llap.daemon.impl.TaskExecutorService$TaskWrapper.finishableStateUpdated(boolean)
@bci=27, line=733 (Compiled frame)
 - org.apache.hadoop.hive.llap.daemon.impl.QueryInfo$FinishableStateTracker.sourceStateUpdated(java.lang.String)
@bci=76, line=210 (Compiled frame)
 - org.apache.hadoop.hive.llap.daemon.impl.QueryInfo.sourceStateUpdated(java.lang.String)
@bci=5, line=164 (Compiled frame)
 - org.apache.hadoop.hive.llap.daemon.impl.QueryTracker.registerSourceStateChange(java.lang.String,
java.lang.String, org.apache.hadoop.hive.llap.daemon.rpc.LlapDaemonProtocolProtos$SourceStateProto)
@bci=34, line=228 (Compiled frame)
 - org.apache.hadoop.hive.llap.daemon.impl.ContainerRunnerImpl.sourceStateUpdated(org.apache.hadoop.hive.llap.daemon.rpc.LlapDaemonProtocolProtos$SourceStateUpdatedRequestProto)
@bci=47, line=255 (Compiled frame)
 - org.apache.hadoop.hive.llap.daemon.impl.LlapDaemon.sourceStateUpdated(org.apache.hadoop.hive.llap.daemon.rpc.LlapDaemonProtocolProtos$SourceStateUpdatedRequestProto)
@bci=5, line=328 (Compiled frame)
 - org.apache.hadoop.hive.llap.daemon.impl.LlapDaemonProtocolServerImpl.sourceStateUpdated(com.google.protobuf.RpcController,
org.apache.hadoop.hive.llap.daemon.rpc.LlapDaemonProtocolProtos$SourceStateUpdatedRequestProto)
@bci=5, line=105 (Compiled frame)
 - org.apache.hadoop.hive.llap.daemon.rpc.LlapDaemonProtocolProtos$LlapDaemonProtocol$2.callBlockingMethod(com.google.protobuf.Descriptors$MethodDescriptor,
com.google.protobuf.RpcController, com.google.protobuf.Message) @bci=80, line=13067 (Compiled
frame)
 - org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(org.apache.hadoop.ipc.RPC$Server,
java.lang.String, org.apache.hadoop.io.Writable, long) @bci=246, line=616 (Compiled frame)
 - org.apache.hadoop.ipc.RPC$Server.call(org.apache.hadoop.ipc.RPC$RpcKind, java.lang.String,
org.apache.hadoop.io.Writable, long) @bci=9, line=969 (Compiled frame)
 - org.apache.hadoop.ipc.Server$Handler$1.run() @bci=38, line=2151 (Compiled frame)
 - org.apache.hadoop.ipc.Server$Handler$1.run() @bci=1, line=2147 (Compiled frame)
 - java.security.AccessController.doPrivileged(java.security.PrivilegedExceptionAction, java.security.AccessControlContext)
@bci=0 (Compiled frame)
 - javax.security.auth.Subject.doAs(javax.security.auth.Subject, java.security.PrivilegedExceptionAction)
@bci=42, line=422 (Compiled frame)
 - org.apache.hadoop.security.UserGroupInformation.doAs(java.security.PrivilegedExceptionAction)
@bci=14, line=1657 (Compiled frame)
 - org.apache.hadoop.ipc.Server$Handler.run() @bci=315, line=2145 (Interpreted frame)


and 


Thread 34500: (state = BLOCKED)
 - org.apache.hadoop.hive.llap.daemon.impl.QueryInfo$FinishableStateTracker.unregisterForUpdates(org.apache.hadoop.hive.llap.daemon.FinishableStateUpdateHandler)
@bci=0, line=195 (Compiled frame)
 - org.apache.hadoop.hive.llap.daemon.impl.QueryInfo.unregisterFinishableStateUpdate(org.apache.hadoop.hive.llap.daemon.FinishableStateUpdateHandler)
@bci=5, line=160 (Compiled frame)
 - org.apache.hadoop.hive.llap.daemon.impl.QueryFragmentInfo.unregisterForFinishableStateUpdates(org.apache.hadoop.hive.llap.daemon.FinishableStateUpdateHandler)
@bci=5, line=143 (Compiled frame)
 - org.apache.hadoop.hive.llap.daemon.impl.TaskExecutorService$TaskWrapper.maybeUnregisterForFinishedStateNotifications()
@bci=20, line=681 (Compiled frame)
 - org.apache.hadoop.hive.llap.daemon.impl.TaskExecutorService$InternalCompletionListener.onSuccess(org.apache.tez.runtime.task.TaskRunner2Result)
@bci=32, line=548 (Compiled frame)
 - org.apache.hadoop.hive.llap.daemon.impl.TaskExecutorService$InternalCompletionListener.onSuccess(java.lang.Object)
@bci=5, line=535 (Compiled frame)
 - com.google.common.util.concurrent.Futures$4.run() @bci=55, line=1149 (Compiled frame)
 - java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker)
@bci=95, line=1142 (Compiled frame)
 - java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=617 (Interpreted frame)
 - java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)

"IPC Server handler 0 on 15001":
  waiting to lock Monitor@0x00007f5d322ecb08 (Object@0x00007f67032cd2c0, a org/apache/hadoop/hive/llap/daemon/impl/TaskExecutorService$TaskWrapper),
  which is held by "ExecutionCompletionThread #0"
"ExecutionCompletionThread #0":
  waiting to lock Monitor@0x00007f6066b9e8c8 (Object@0x00007f66b6570200, a org/apache/hadoop/hive/llap/daemon/impl/QueryInfo$FinishableStateTracker),
  which is held by "IPC Server handler 0 on 15001"

Found a total of 1 deadlock.

{noformat}

Looks like it's caused by synchronized blocks:
{noformat}
TaskWrapper:
public synchronized void maybeUnregisterForFinishedStateNotifications
{noformat}
Eventually calls 
{noformat}
FinishableStateTracker
synchronized void unregisterForUpdates(FinishableStateUpdateHandler handler) {
{noformat}

and 
{noformat}
FST
 synchronized void sourceStateUpdated(String sourceName) {
   {noformat}
eventually calls
{noformat}
 public synchronized boolean isInWaitQueue() {
{noformat}

The latter returns the boolean, so it definitely doesn't need synchronized, however I don't
know if there are other similar issues and what is necessary inside sync blocks, perhaps there's
a better fix.

Overall I'd say synch methods on objects that call any other non-trivial objects should not
be used. Perhaps for now it would be good to replace all sync methods by sync blocks that
cover entire method, as well as remove the unnecessary ones like the isWait... one. Then the
scope of the blocks can be adjusted based on logic in future.




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