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https://issues.apache.org/jira/browse/HBASE-16768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15552890#comment-15552890
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ChiaPing Tsai commented on HBASE-16768:
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I follow the logic of HStore#add(cell) which uses the read lock also.
According to the comments in HStore, the MemStore is assumed to be thread safe.
So it use the read lock.
> Inconsistent results from the Append/Increment
> ----------------------------------------------
>
> Key: HBASE-16768
> URL: https://issues.apache.org/jira/browse/HBASE-16768
> Project: HBase
> Issue Type: Bug
> Reporter: ChiaPing Tsai
> Assignee: ChiaPing Tsai
> Priority: Minor
> Fix For: 2.0.0
>
> Attachments: HBASE-16768.v0.patch, HBASE-16768.v1.patch,
> HBASE-16768.v2.patch
>
>
> If the Append/Increment skips the WAL, the sequential id will not be updated.
> It introduces that the AbstractMemStore#upsert may remove the cell even
> though the cell is visible to the oldest scanner.
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