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[jira] [Resolved] (HBASE-20568) Concurrency issue for CombinedAsyncWriter


     [ https://issues.apache.org/jira/browse/HBASE-20568?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Duo Zhang resolved HBASE-20568.
-------------------------------
    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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