[jira] [Created] (FLINK-16510) Task manager safeguard shutdown may not be reliable

["Maximilian Michels (Jira)" <ji...@apache.org>]

Maximilian Michels created FLINK-16510:
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             Summary: Task manager safeguard shutdown may not be reliable
                 Key: FLINK-16510
                 URL: https://issues.apache.org/jira/browse/FLINK-16510
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Task
            Reporter: Maximilian Michels


The {{JvmShutdownSafeguard}} does not always succeed but can hang when multiple threads attempt to shutdown the JVM. Apparently mixing {{System.exit()}} with ShutdownHooks and forcefully terminating the JVM via {{Runtime.halt()}} does not play together well:

{noformat}
"Jvm Terminator" #22 daemon prio=5 os_prio=0 tid=0x00007fb8e82f2800 nid=0x5a96 runnable [0x00007fb35cffb000]
   java.lang.Thread.State: RUNNABLE
	at java.lang.Shutdown.$$YJP$$halt0(Native Method)
	at java.lang.Shutdown.halt0(Shutdown.java)
	at java.lang.Shutdown.halt(Shutdown.java:139)
	- locked <0x000000047ed67638> (a java.lang.Shutdown$Lock)
	at java.lang.Runtime.halt(Runtime.java:276)
	at org.apache.flink.runtime.util.JvmShutdownSafeguard$DelayedTerminator.run(JvmShutdownSafeguard.java:86)
	at java.lang.Thread.run(Thread.java:748)

   Locked ownable synchronizers:
	- None

"FlinkCompletableFutureDelayScheduler-thread-1" #18154 daemon prio=5 os_prio=0 tid=0x00007fb708a7d000 nid=0x5a8a waiting for monitor entry [0x00007fb289d49000]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at java.lang.Shutdown.halt(Shutdown.java:139)
	- waiting to lock <0x000000047ed67638> (a java.lang.Shutdown$Lock)
	at java.lang.Shutdown.exit(Shutdown.java:213)
	- locked <0x000000047edb7348> (a java.lang.Class for java.lang.Shutdown)
	at java.lang.Runtime.exit(Runtime.java:110)
	at java.lang.System.exit(System.java:973)
	at org.apache.flink.runtime.taskexecutor.TaskManagerRunner.terminateJVM(TaskManagerRunner.java:266)
	at org.apache.flink.runtime.taskexecutor.TaskManagerRunner.lambda$onFatalError$1(TaskManagerRunner.java:260)
	at org.apache.flink.runtime.taskexecutor.TaskManagerRunner$$Lambda$27464/1464672548.accept(Unknown Source)
	at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:774)
	at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:750)
	at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:488)
	at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1990)
	at org.apache.flink.runtime.concurrent.FutureUtils$Timeout.run(FutureUtils.java:943)
	at org.apache.flink.runtime.concurrent.DirectExecutorService.execute(DirectExecutorService.java:211)
	at org.apache.flink.runtime.concurrent.FutureUtils.lambda$orTimeout$11(FutureUtils.java:361)
	at org.apache.flink.runtime.concurrent.FutureUtils$$Lambda$27435/159015392.run(Unknown Source)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

   Locked ownable synchronizers:
	- <0x00000006d5e56bd0> (a java.util.concurrent.ThreadPoolExecutor$Worker)
{noformat}

Note that under this condition the JVM should terminate but it still hangs. Sometimes it quits after several minutes.



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