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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-7048) Uber AM can crash due to unknown task in statusUpdate
Date Mon, 12 Feb 2018 20:56:00 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-7048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jason Lowe updated MAPREDUCE-7048:
----------------------------------
       Resolution: Fixed
     Hadoop Flags: Reviewed
    Fix Version/s: 2.7.6
                   2.8.4
                   2.9.1
                   2.10.0
                   3.0.1
                   3.1.0
           Status: Resolved  (was: Patch Available)

Thanks, [~pbacsko]!  I committed this to trunk, branch-3.1, branch-3.0, branch-3.0.1, branch-2,
branch-2.9, branch-2.8, and branch-2.7.

> Uber AM can crash due to unknown task in statusUpdate
> -----------------------------------------------------
>
>                 Key: MAPREDUCE-7048
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7048
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mr-am
>    Affects Versions: 3.1.0, 3.0.1, 2.10.0, 2.9.1, 2.8.4, 2.7.6
>            Reporter: Peter Bacsko
>            Assignee: Peter Bacsko
>            Priority: Major
>             Fix For: 3.1.0, 3.0.1, 2.10.0, 2.9.1, 2.8.4, 2.7.6
>
>         Attachments: MAPREDUCE-7048-001.patch, MAPREDUCE-7048-002.patch, MAPREDUCE-7048-003.patch,
MAPREDUCE-7048-branch-2.01.patch, MAPREDUCE-7048-branch-2.7.01.patch, MAPREDUCE-7048-branch-2.7.01.patch,
MAPREDUCE-7048-branch-2.8.01.patch, MAPREDUCE-7048-branch-2.9.01.patch
>
>
> The testcase TestUberAM#testThreadDumpOnTaskTimeout was supposed to be fixed by MAPREDUCE-7020.
However, it still fails, see: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/7325/testReport/junit/org.apache.hadoop.mapreduce.v2/TestMRJobs/testThreadDumpOnTaskTimeout/
(note: other tests failed as well, but those look unrelated).
> When I tried to reproduce it locally, it failed again, although with a slightly different
error message (it was actually the same as before):
> {noformat}
> [INFO] -------------------------------------------------------
> [INFO]  T E S T S
> [INFO] -------------------------------------------------------
> [INFO] Running org.apache.hadoop.mapreduce.v2.TestUberAM
> [ERROR] Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 128.192 s <<<
FAILURE! - in org.apache.hadoop.mapreduce.v2.TestUberAM
> [ERROR] testThreadDumpOnTaskTimeout(org.apache.hadoop.mapreduce.v2.TestUberAM)  Time
elapsed: 79.539 s  <<< FAILURE!
> java.lang.AssertionError: No AppMaster log found! expected:<1> but was:<2>
> 	at org.junit.Assert.fail(Assert.java:88)
> 	at org.junit.Assert.failNotEquals(Assert.java:743)
> 	at org.junit.Assert.assertEquals(Assert.java:118)
> 	at org.junit.Assert.assertEquals(Assert.java:555)
> 	at org.apache.hadoop.mapreduce.v2.TestMRJobs.testThreadDumpOnTaskTimeout(TestMRJobs.java:1228)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:498)
> 	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
> 	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> 	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
> 	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
> 	at org.junit.internal.runners.statements.FailOnTimeout$StatementThread.run(FailOnTimeout.java:74)
> {noformat}
> *Root cause:* {{System.exit()}} is still invoked at {{Task.statusUpdate()}}
> {noformat}
>   public void statusUpdate(TaskUmbilicalProtocol umbilical) 
>   throws IOException {
>     int retries = MAX_RETRIES;
>     while (true) {
>       try {
>         if (!umbilical.statusUpdate(getTaskID(), taskStatus).getTaskFound()) {
>           LOG.warn("Parent died.  Exiting "+taskId);
>           System.exit(66);
>         }
>         taskStatus.clearStatus();
>         return;
>         ...
> {noformat}
> At this point, the task was not found and return value of {{umbilical.statusUpdate()}}
is false. Checking whether we run in uber mode seems to solve the problem.



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