Michael Stack commented on HBASE-23157:

How did you figure this one out [~binlijin]?

You are adding an extra sync just-in-case?


> WAL unflushed seqId tracking may wrong when Durability.ASYNC_WAL is used
> ------------------------------------------------------------------------
>                 Key: HBASE-23157
>                 URL: https://issues.apache.org/jira/browse/HBASE-23157
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver, wal
>    Affects Versions: 2.2.1
>            Reporter: Lijin Bin
>            Assignee: Lijin Bin
>            Priority: Major
>         Attachments: HBASE-23157-master-v1.patch
> Durability.ASYNC_WAL do not wait wal sync and commit mvcc ahead. So when 
> region start flush may get a large flushedSeqId and later wal process buffer 
> entry and put a small unflushedSequenceIds for this region again.

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