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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6977) Multithread processing ZK assignment events
Date Thu, 25 Oct 2012 19:45:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13484419#comment-13484419

Hudson commented on HBASE-6977:

Integrated in HBase-TRUNK-on-Hadoop-2.0.0 #236 (See [https://builds.apache.org/job/HBase-TRUNK-on-Hadoop-2.0.0/236/])
    HBASE-6977 Multithread processing ZK assignment events (Revision 1402226)

     Result = FAILURE
jxiang : 
Files : 
* /hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/HRegionInfo.java
* /hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java
* /hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/master/OfflineCallback.java

> Multithread processing ZK assignment events
> -------------------------------------------
>                 Key: HBASE-6977
>                 URL: https://issues.apache.org/jira/browse/HBASE-6977
>             Project: HBase
>          Issue Type: Improvement
>          Components: Region Assignment
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>            Priority: Minor
>             Fix For: 0.96.0
>         Attachments: trunk-6977_v1.patch, trunk-6977_v2-1.patch, trunk-6977_v3.patch
> Related to HBASE-6976 and HBASE-6611.  ZK events processing is a bottle neck for assignments,
since there is only one ZK event thread.  If we can use multiple threads, it should be better.
> With multiple threads, the order of events could be messed up. However, if we pass all
events related to one region always to the same worker thread, the order should be kept.
> We need to play with it and find out how much performance imrovement we can get.

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