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https://issues.apache.org/jira/browse/HADOOP-4128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12629498#action_12629498
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Steve Loughran commented on HADOOP-4128:
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one possible root cause of this could be my tests deleting the datanode
directory before the datanode is terminated. Or the new service code isn't
terminating a datanode properly. More research needed on my side. Whatever the
cause, the unexpected disappearance of any part of the filesystem is something
that datanodes may encounter, and should be reported more meaningfully than
with an NPE
> NPE in FSDir.getBlockInfo
> -------------------------
>
> Key: HADOOP-4128
> URL: https://issues.apache.org/jira/browse/HADOOP-4128
> Project: Hadoop Core
> Issue Type: Bug
> Components: fs
> Affects Versions: 0.19.0
> Reporter: Steve Loughran
> Priority: Minor
> Fix For: 0.19.0
>
> Attachments: hadoop-4128.patch
>
>
> This could well be something I've introduced on my variant of the code,
> although its a recent arrival in my own tests: an NPE while bringing up a
> datanode.
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