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https://issues.apache.org/jira/browse/HBASE-2476?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon reassigned HBASE-2476:
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Assignee: Todd Lipcon
> HLog sequence number is obtained outside updateLock
> ---------------------------------------------------
>
> Key: HBASE-2476
> URL: https://issues.apache.org/jira/browse/HBASE-2476
> Project: Hadoop HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 0.20.5
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Critical
> Attachments: hbase-2476.txt
>
>
> In one of the overloads of HLog.append, obtainSeqNum() is called before
> this.updateLock is acquired. This means that it's possible for some other
> thread to have a higher sequence number but achieve its write first, and
> hence the lastSeqWritten map can become incorrect.
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