[jira] [Commented] (HBASE-6471) Performance regression caused by HBASE-4054

["Lars Hofhansl (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-6471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13433888#comment-13433888 ] 

Lars Hofhansl commented on HBASE-6471:
--------------------------------------

Looks good to me.
                
> 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: 0.94.2
>
>         Attachments: trunk-6471.patch, trunk-6471.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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