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https://issues.apache.org/jira/browse/HDFS-11660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15975453#comment-15975453
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John Zhuge commented on HDFS-11660:
-----------------------------------
Thanks [~andrew.wang] for working on this tricky issue.
TestFsDatasetCache.java#118: extra space before "*"
At TestFsDatasetCache.java#154, the singleton
{{DataNodeFaultInjector.instance}} is changed. There are a few other test
classes that changes the same singleton:
* TestDataNodeMetrics
* TestShortCircuitCache
How can we prevent these tests to run in parallel?
Should we use annotation {{@NotThreadSafe}}?
http://maven.apache.org/surefire/maven-surefire-plugin/examples/fork-options-and-parallel-execution.html
As for testing, unfortunately I have not been able to reproduce the issue using
{{grind test -i TestFsDatasetCache -n 100}} on either trunk or CDH5.
> TestFsDatasetCache#testPageRounder fails intermittently with AssertionError
> ---------------------------------------------------------------------------
>
> Key: HDFS-11660
> URL: https://issues.apache.org/jira/browse/HDFS-11660
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: test
> Affects Versions: 2.6.5
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Attachments: HDFS-11660.001.patch, HDFS-11660.002.patch
>
>
> We've seen this test fail occasionally with an error like the following:
> {noformat}
> java.lang.AssertionError
> at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.offerService(BPServiceActor.java:510)
> at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:695)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
> This assertion fires when the heartbeat response is null
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