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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3673) Reduce HTable Pool Contention Using Concurrent Collections
Date Sun, 20 Mar 2011 00:32:29 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13008857#comment-13008857
] 

stack commented on HBASE-3673:
------------------------------

Patch looks good Karthick.  You tried it?  Any noticeable difference?  Good on you K.

> Reduce HTable Pool Contention Using Concurrent Collections
> ----------------------------------------------------------
>
>                 Key: HBASE-3673
>                 URL: https://issues.apache.org/jira/browse/HBASE-3673
>             Project: HBase
>          Issue Type: Improvement
>          Components: client
>    Affects Versions: 0.90.1, 0.90.2
>            Reporter: Karthick Sankarachary
>            Assignee: Karthick Sankarachary
>            Priority: Minor
>             Fix For: 0.90.0
>
>         Attachments: HBASE-3673.patch
>
>   Original Estimate: 5m
>  Remaining Estimate: 5m
>
> In the case of medium-to-large sized HTable pools, the amount of time the client spends
blocking on the underlying map and queue data structures turns out to be quite significant.
Using an efficient wait-free implementation of maps and queues might serve to reduce the contention
on the pool. In particular, I was wondering if we should replace the synchronized map with
a concurrent hash map, and linked list with a concurrent linked queue.

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