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https://issues.apache.org/jira/browse/HDFS-11078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15624048#comment-15624048
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Inigo Goiri commented on HDFS-11078:
------------------------------------
There are no other tests related to the scrubber from what I can tell.
I would ignore the addition of tests for this particular case.
> NPE in LazyPersistFileScrubber
> ------------------------------
>
> Key: HDFS-11078
> URL: https://issues.apache.org/jira/browse/HDFS-11078
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Inigo Goiri
> Assignee: Inigo Goiri
> Attachments: HDFS-11078.000.patch
>
>
> If a block is removed, it will be removed from the block map. When the
> clearCorruptLazyPersistFiles() tries to delete the block, it may already be
> deleted and generate a null pointer exception.
> java.lang.NullPointerException
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem$LazyPersistFileScrubber.clearCorruptLazyPersistFiles(FSNamesystem.java:3820)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem$LazyPersistFileScrubber.run(FSNamesystem.java:3851)
> at java.lang.Thread.run(Thread.java:745)
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