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https://issues.apache.org/jira/browse/HBASE-17662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15891904#comment-15891904
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Anastasia Braginsky commented on HBASE-17662:
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[~anoop.hbase], thank you very much!
> Disable in-memory flush when replaying from WAL
> -----------------------------------------------
>
> Key: HBASE-17662
> URL: https://issues.apache.org/jira/browse/HBASE-17662
> Project: HBase
> Issue Type: Sub-task
> Affects Versions: 2.0.0
> Reporter: Anastasia Braginsky
> Assignee: Anastasia Braginsky
> Fix For: 2.0.0
>
> Attachments: HBASE-17662-V02.patch, HBASE-17662-V03.patch,
> HBASE-17662-V04.patch, HBASE-17662-V05.patch, HBASE-17662-V06.patch,
> HBASE-17662-V08.patch, HBASE-17662-V09-II.patch, HBASE-17662-V09.patch
>
>
> When replaying the edits from WAL, the region's updateLock is not taken,
> because a single threaded action is assumed. However, the thread-safeness of
> the in-memory flush of CompactingMemStore is based on taking the region's
> updateLock.
> The in-memory flush can be skipped in the replay time (anyway everything is
> flushed to disk just after the replay). Therefore it is acceptable to just
> skip the in-memory flush action while the updates come as part of replay from
> WAL.
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