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From "Hrishikesh Gadre (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-13799) TestEditLogTailer#testTriggersLogRollsForAllStandbyNN test fail due to missing synchronization between rollEditsRpcExecutor and tailerThread shutdown
Date Mon, 06 Aug 2018 21:05:00 GMT
Hrishikesh Gadre created HDFS-13799:
---------------------------------------

             Summary: TestEditLogTailer#testTriggersLogRollsForAllStandbyNN test fail due
to missing synchronization between rollEditsRpcExecutor and tailerThread shutdown
                 Key: HDFS-13799
                 URL: https://issues.apache.org/jira/browse/HDFS-13799
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: ha
    Affects Versions: 3.0.0
            Reporter: Hrishikesh Gadre


TestEditLogTailer#testTriggersLogRollsForAllStandbyNN unit test is failing in our internal
environment with following error,
{noformat}
java.lang.AssertionError: Test resulted in an unexpected exit
	at org.apache.hadoop.hdfs.server.namenode.ha.TestEditLogTailer.testTriggersLogRollsForAllStandbyNN(TestEditLogTailer.java:245){noformat}
This test failure is due to following error during shutdown of the MiniDfsCluster
{noformat}
2018-07-31 21:59:27,806 [main] INFO  hdfs.MiniDFSCluster (MiniDFSCluster.java:shutdown(1965))
- Shutting down the Mini HDFS Cluster
2018-07-31 21:59:27,806 [main] FATAL hdfs.MiniDFSCluster (MiniDFSCluster.java:shutdown(1968))
- Test resulted in an unexpected exit
1: java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.FutureTask@1ce1d2b6
rejected from java.util.concurrent.ThreadPoolExecutor@12263f5a[Terminated, pool size = 0,
active threads = 0, queued tasks = 0, completed tasks = 0]
	at org.apache.hadoop.util.ExitUtil.terminate(ExitUtil.java:265)
	at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread.doWork(EditLogTailer.java:441)
	at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread.access$400(EditLogTailer.java:380)
	at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread$1.run(EditLogTailer.java:397)
	at org.apache.hadoop.security.SecurityUtil.doAsLoginUserOrFatal(SecurityUtil.java:482)
	at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread.run(EditLogTailer.java:393)
Caused by: java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.FutureTask@1ce1d2b6
rejected from java.util.concurrent.ThreadPoolExecutor@12263f5a[Terminated, pool size = 0,
active threads = 0, queued tasks = 0, completed tasks = 0]
	at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2047)
	at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:823)
	at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1369)
	at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)
	at java.util.concurrent.Executors$DelegatedExecutorService.submit(Executors.java:681)
	at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer.triggerActiveLogRoll(EditLogTailer.java:351)
	at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread.doWork(EditLogTailer.java:411)
	... 4 more{noformat}
It looks like the EditLogTailer class is not handling the shutdown correctly. Specifically
the EditLogTailer#stop() method shuts down the rollEditsRpcExecutor executor service before
setting the tailerThread#shouldRun flag. This is a race condition since the tailerThread
can try to submit a new task to this executor service which has been asked to shutdown. If
that happens, it will receive an unexpected RejectedExecutionException, resulting in a test
failure. The solution should be to properly synchronize shutdown of tailerThread with rollEditsRpcExecutor.



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