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https://issues.apache.org/jira/browse/HBASE-12600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14391904#comment-14391904
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Lars Hofhansl commented on HBASE-12600:
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Looks like this undoes all of HBASE-9751, HBASE-8151, and HBASE-8166.
We're always storing the mvcc readpoints, and we never compare them against the
actual smallestReadpoint, and hence we're always performing all the checks,
tests, and comparisons that these jiras removed in addition to actually storing
the data - which with up to 8 bytes per Cell is not trivial.
> Remove REPLAY tag dependency in Distributed Replay Mode
> -------------------------------------------------------
>
> Key: HBASE-12600
> URL: https://issues.apache.org/jira/browse/HBASE-12600
> Project: HBase
> Issue Type: Bug
> Components: wal
> Affects Versions: 2.0.0, 0.99.1
> Reporter: Jeffrey Zhong
> Assignee: Jeffrey Zhong
> Fix For: 2.0.0, 0.99.2
>
> Attachments: HBASE-12600.patch
>
>
> After HBASE-11315 & HBASE-8763, each edit has a unique 'version' i.e. its
> SequenceId(or old mvcc value). Therefore, we don't need replay tag to handle
> out of order same version updates.
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