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https://issues.apache.org/jira/browse/HDFS-11078?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Inigo Goiri updated HDFS-11078:
-------------------------------
    Attachment: HDFS-11078.000.patch

Checking if the block is not in the system anymore in the 
{{LazyPresistFileScrubber}}. I'm open to a better log message.

> 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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