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https://issues.apache.org/jira/browse/TEZ-2298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14487741#comment-14487741
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Siddharth Seth commented on TEZ-2298:
-------------------------------------
This is a spurious log line which is logged and causes confusion. There was a
fix to an actual issue to get rid of an NPE. We should probably just remove
this log or log just the message.
> Ignore sending failure message, when TaskReporter$HeartbeatCallable is
> shutdown
> -------------------------------------------------------------------------------
>
> Key: TEZ-2298
> URL: https://issues.apache.org/jira/browse/TEZ-2298
> Project: Apache Tez
> Issue Type: Bug
> Reporter: Rajesh Balamohan
>
> {noformat}
> 2015-04-09 03:18:37,002 INFO [TezChild] task.TezTaskRunner: Ignoring the
> following exception since a previous exception is already registered
> java.lang.NullPointerException
> at
> org.apache.tez.runtime.task.TaskReporter$HeartbeatCallable.access$300(TaskReporter.java:121)
> at
> org.apache.tez.runtime.task.TaskReporter.taskFailed(TaskReporter.java:383)
> at
> org.apache.tez.runtime.task.TezTaskRunner.sendFailure(TezTaskRunner.java:265)
> at
> org.apache.tez.runtime.task.TezTaskRunner.access$600(TezTaskRunner.java:51)
> at
> org.apache.tez.runtime.task.TezTaskRunner$TaskRunnerCallable$1.run(TezTaskRunner.java:227)
> at
> org.apache.tez.runtime.task.TezTaskRunner$TaskRunnerCallable$1.run(TezTaskRunner.java:171)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
> at
> org.apache.tez.runtime.task.TezTaskRunner$TaskRunnerCallable.callInternal(TezTaskRunner.java:171)
> at
> org.apache.tez.runtime.task.TezTaskRunner$TaskRunnerCallable.callInternal(TezTaskRunner.java:167)
> at org.apache.tez.common.CallableWithNdc.call(CallableWithNdc.java:36)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
> Lot of these messages are seen in logs. Even though it is harmless, this can
> be very misleading when trying to debug the reason for some other exception.
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