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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8680) distributedLogReplay performance regression
Date Tue, 04 Jun 2013 21:45:21 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13675296#comment-13675296
] 

stack commented on HBASE-8680:
------------------------------

+1
                
> 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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