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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6471) Performance regression caused by HBASE-4054
Date Wed, 22 Aug 2012 13:49:46 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13439516#comment-13439516
] 

Hudson commented on HBASE-6471:
-------------------------------

Integrated in HBase-0.94-security #48 (See [https://builds.apache.org/job/HBase-0.94-security/48/])
    HBASE-6471 Performance regression caused by HBASE-4054 (Revision 1373916)

     Result = FAILURE
jxiang : 
Files : 
* /hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/client/HTablePool.java
* /hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/rest/RegionsResource.java
* /hbase/branches/0.94/src/test/java/org/apache/hadoop/hbase/client/TestHTablePool.java

                
> Performance regression caused by HBASE-4054
> -------------------------------------------
>
>                 Key: HBASE-6471
>                 URL: https://issues.apache.org/jira/browse/HBASE-6471
>             Project: HBase
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 0.92.0
>            Reporter: Lars George
>            Assignee: Jimmy Xiang
>            Priority: Critical
>             Fix For: 0.96.0, 0.94.2
>
>         Attachments: trunk-6471.patch, trunk-6471.patch, trunk-6471_v2.patch
>
>
> The patch in HBASE-4054 switches the PooledHTable to extend HTable as opposed to implement
HTableInterface.
> Since HTable does not have an empty constructor, the patch added a call to the super()
constructor, which though does trigger the ZooKeeper and META scan, causing a considerable
delay. 
> With multiple threads using the pool in parallel, the first thread is holding up all
the subsequent ones, in effect it negates the whole reason we have a HTable pool.
> We should complete HBASE-5728, or alternatively add a protected, empty constructor the
HTable. I am +1 for the former.

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