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https://issues.apache.org/jira/browse/HADOOP-4128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12629517#action_12629517
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Steve Loughran commented on HADOOP-4128:
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Moving the shouldRun = false assignment up to earlier on in the server shutdown
process appears to make this message go away altogether. It is clearly a race
condition in my test -the temporary directories are cleaned before the datanode
has shut down, but telling the data receiver threads sooner rather than later
to shut down makes the window much smaller.
Question is: is that an appropriate patch? Or should the window be left fairly
wide, so that its existence is more obvious?
> 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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