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https://issues.apache.org/jira/browse/HBASE-20568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16471667#comment-16471667
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Duo Zhang commented on HBASE-20568:
-----------------------------------
It is not easy to fix, as now we only depend on the public method of
AsyncWriter interface. And after HBASE-20424, we will not need the sequential
mode any more, so maybe we can just resolve this issue by resolving
HBASE-20424...
> 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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