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https://issues.apache.org/jira/browse/HDFS-1497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12967454#action_12967454
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Todd Lipcon commented on HDFS-1497:
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Ran unit tests, only got known failures, this should be ready for commit.
> Write pipeline sequence numbers should be sequential with no skips or
> duplicates
> --------------------------------------------------------------------------------
>
> Key: HDFS-1497
> URL: https://issues.apache.org/jira/browse/HDFS-1497
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs client
> Affects Versions: 0.20-append, 0.22.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: hdfs-1497.txt, hdfs-1497.txt
>
>
> In HDFS-895 we discovered that multiple hflush() calls in a row without
> intervening writes could cause a skip in sequence number. This doesn't seem
> to have any direct consequences, but we should maintain and assert the
> invariant that sequence numbers have no gaps or duplicates.
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