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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17662) Disable in-memory flush when replaying from WAL
Date Fri, 24 Feb 2017 05:36:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15882009#comment-15882009
] 

ramkrishna.s.vasudevan commented on HBASE-17662:
------------------------------------------------

+1 on this patch if we agree with moving the check under the 'if' condition that checks for
the size.

> 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
>            Reporter: Anastasia Braginsky
>            Assignee: Anastasia Braginsky
>         Attachments: HBASE-17662-V02.patch, HBASE-17662-V03.patch, HBASE-17662-V04.patch,
HBASE-17662-V05.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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