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https://issues.apache.org/jira/browse/HBASE-15046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15073403#comment-15073403
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Heng Chen commented on HBASE-15046:
-----------------------------------
Currently, sync WAL is not really 'sync' (it use hflush not hsync). So with
'rollback memstore', it may cause inconsistency between WAL and memstore. I am
not sure the tradeoff between performance and correctness?
> Perf test doing all mutation steps under row lock
> -------------------------------------------------
>
> Key: HBASE-15046
> URL: https://issues.apache.org/jira/browse/HBASE-15046
> Project: HBase
> Issue Type: Sub-task
> Components: Performance
> Reporter: stack
>
> This issue is about perf testing a redo of the write pipeline so that rather
> than:
> * take rowlock
> * start mvcc
> * append to WAL
> * add to memstore
> * sync WAL
> * let go of rowlock
> * finish up mvcc
> instead.... try...
> * take rowlock
> * start mvcc
> * append to WAL
> * sync WAL
> * add to memstore
> * finish up mvcc
> * let go of rowlock
> The latter is more straight-forward undoing need of rolling back memstore if
> all does not succeed.
> It might be slower though. This issue is a look-see/try it.
> The redo will also help address the parent issue in a more general way so we
> can do without the special-casing done for branch-1.0 and branch-1.1 done in
> a sibling subtask.
> Other benefits are that the current write pipeline is copy/pasted in a few
> places -- in append, increment and checkand* -- and a refactor will allow us
> to fix this duplication.
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