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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17662) Disable in-memory flush when replaying from WAL
Date Wed, 01 Mar 2017 19:41:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15890903#comment-15890903

Hudson commented on HBASE-17662:

FAILURE: Integrated in Jenkins build HBase-Trunk_matrix #2594 (See [https://builds.apache.org/job/HBase-Trunk_matrix/2594/])
HBASE-17662 Disable in-memory flush when replaying from WAL (anoopsamjohn: rev 613bcb3622ecb1783c030f34ea2975280e1c43c1)
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/CompactingMemStore.java
* (edit) hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/wal/AbstractTestWALReplay.java
* (edit) hbase-server/src/test/java/org/apache/hadoop/hbase/io/TestHeapSize.java
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/MemStore.java
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HStore.java
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/DefaultMemStore.java
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/AbstractMemStore.java
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java

> 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,
> 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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