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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8680) distributedLogReplay performance regression
Date Wed, 05 Jun 2013 05:33:21 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13675620#comment-13675620
] 

Hudson commented on HBASE-8680:
-------------------------------

Integrated in hbase-0.95-on-hadoop2 #122 (See [https://builds.apache.org/job/hbase-0.95-on-hadoop2/122/])
    HBASE-8680: distributedLogReplay performance regression (Revision 1489680)

     Result = FAILURE
jeffreyz : 
Files : 
* /hbase/branches/0.95/hbase-server/src/main/java/org/apache/hadoop/hbase/master/RegionStates.java
* /hbase/branches/0.95/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
* /hbase/branches/0.95/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/SplitLogWorker.java
* /hbase/branches/0.95/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLogSplitter.java
* /hbase/branches/0.95/hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestSplitLogWorker.java

                
> distributedLogReplay performance regression
> -------------------------------------------
>
>                 Key: HBASE-8680
>                 URL: https://issues.apache.org/jira/browse/HBASE-8680
>             Project: HBase
>          Issue Type: Bug
>          Components: MTTR
>            Reporter: Jeffrey Zhong
>            Assignee: Jeffrey Zhong
>             Fix For: 0.98.0, 0.95.2
>
>         Attachments: 8680-v2.patch, hbase-8680.patch, hbase-8680-v3.patch
>
>
> The JIRA is to check in changes to address performance issues found during my performance
testing as following:
> 1) When WALEdits belongs to a region which split/merged later, replay incurs extra waitUntilRegionOnline
RPC call
> 2) Using a single shared connection for replaying achieves better performance. Everytime
creating a new connection, it incurs 4+ seconds to establish a connection to ZK.
> 3) other small modifications to mitigate excessive logging

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