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From "Anastasia Braginsky (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17662) Disable in-memory flush when replaying from WAL
Date Thu, 02 Mar 2017 09:23:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15891904#comment-15891904
] 

Anastasia Braginsky commented on HBASE-17662:
---------------------------------------------

[~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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