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https://issues.apache.org/jira/browse/HBASE-20568?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Duo Zhang resolved HBASE-20568.
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Resolution: Not A Problem
After HBASE-20424 the problem is gone.
> Concurrency issue for CombinedAsyncWriter
> -----------------------------------------
>
> Key: HBASE-20568
> URL: https://issues.apache.org/jira/browse/HBASE-20568
> Project: HBase
> Issue Type: Sub-task
> Reporter: Duo Zhang
> Priority: Major
>
> In sequential mode, we need to wait for the previous writer's sync completes
> before issue the sync for the next writer. But the sync request is
> asynchronous, so we will return immediately and then we can call append, so
> it is possible that we call append and sync at the same time and cause
> concurrency issues.
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