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https://issues.apache.org/jira/browse/MAPREDUCE-6903?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16381362#comment-16381362
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Xuan Gong commented on MAPREDUCE-6903:
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[~GeLiXin] Thank for working this.
In this fix, we only add the NULL check. Does it really solve the issue?
Normally, when we try to use TimelineClient, we need to initiate the client and
start the client, so the timeline writer can get created. But here, looks like
that the timeline writer is still null, so it would throw out the Null
exception.
> NPE occured when run MapredTestDriver's testcase
> ------------------------------------------------
>
> Key: MAPREDUCE-6903
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6903
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: test
> Affects Versions: 3.0.0-alpha4
> Reporter: LiXin Ge
> Assignee: LiXin Ge
> Priority: Major
> Labels: easyfix
> Attachments: MAPREDUCE-6903.001.patch, MAPREDUCE-6903.002.patch
>
>
> When runing the timelineperformance test from MapredTestDriver without input
> parameter, an NPE was throwed:
> {quote}
> ./hadoop org.apache.hadoop.test.MapredTestDriver timelineperformance
> ...
> 2017-06-08 09:32:13,194 ERROR mapreduce.SimpleEntityWriterV1: writing to the
> timeline service failed
> java.lang.NullPointerException
> at
> org.apache.hadoop.yarn.client.api.impl.TimelineClientImpl.putEntities(TimelineClientImpl.java:178)
> at
> org.apache.hadoop.mapreduce.SimpleEntityWriterV1.map(SimpleEntityWriterV1.java:82)
> at
> org.apache.hadoop.mapreduce.SimpleEntityWriterV1.map(SimpleEntityWriterV1.java:41)
> at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:146)
> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:793)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
> at
> org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:271)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> {quote}
> That's better to add a protection of NULL pointer check.
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