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https://issues.apache.org/jira/browse/HDFS-4777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13645767#comment-13645767
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Aaron T. Myers commented on HDFS-4777:
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bq. My preference is to not logSync at all with FSNamesystem lock held.
No disagreement there - just pointing out that it might be a little difficult
to do in the case of entering safemode, and pointing out that it seems there's
actually relatively few places that need to be addressed in order to get those
tests passing.
> File creation with overwrite flag set to true results in logSync holding
> namesystem lock
> ----------------------------------------------------------------------------------------
>
> Key: HDFS-4777
> URL: https://issues.apache.org/jira/browse/HDFS-4777
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 0.23.0, 2.0.0-alpha
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
> Priority: Blocker
> Attachments: HDFS-4777.patch
>
>
> FSNamesystem#startFileInternal calls delete. Delete method releases the write
> lock, making parts of startFileInternal code unintentionally executed without
> write lock being held.
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