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https://issues.apache.org/jira/browse/HDFS-4315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13533717#comment-13533717
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Aaron T. Myers commented on HDFS-4315:
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I looped this test 5923 times for about 50 hours and it never failed. I'm going
to conclude based on this that this patch fixes the issue.
I'm going to commit this momentarily.
> DNs with multiple BPs can have BPOfferServices fail to start due to
> unsynchronized map access
> ---------------------------------------------------------------------------------------------
>
> Key: HDFS-4315
> URL: https://issues.apache.org/jira/browse/HDFS-4315
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 2.0.2-alpha
> Reporter: Aaron T. Myers
> Assignee: Aaron T. Myers
> Attachments: HDFS-4315.patch
>
>
> In some nightly test runs we've seen pretty frequent failures of
> TestWebHdfsWithMultipleNameNodes. I've traced the root cause to an
> unsynchronized map access in the DataStorage class.
> More details in the first comment.
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