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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7295) Contention in HBaseClient.getConnection
Date Fri, 07 Dec 2012 08:03:21 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13526211#comment-13526211
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Lars Hofhansl commented on HBASE-7295:
--------------------------------------

bq. Since we are using RoundRobin/ThreadLocal pool only - its not necessary to synchronize
on connections

What if somebody uses the Reusable Pool (which is - or at least was at some point - the default
I believe)

                
> Contention in HBaseClient.getConnection
> ---------------------------------------
>
>                 Key: HBASE-7295
>                 URL: https://issues.apache.org/jira/browse/HBASE-7295
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.94.3
>            Reporter: Varun Sharma
>            Assignee: Varun Sharma
>             Fix For: 0.94.4
>
>         Attachments: 7295-0.94.txt, 7295-0.94-v2.txt, 7295-trunk.txt
>
>
> HBaseClient.getConnection() synchronizes on the connections object. We found severe contention
on a thrift gateway which was fanning out roughly 3000+ calls per second to hbase region servers.
The thrift gateway had 2000+ threads for handling incoming connections. Threads were blocked
on the syncrhonized block - we set ipc.pool.size to 200. Since we are using RoundRobin/ThreadLocal
pool only - its not necessary to synchronize on connections - it might lead to cases where
we might go slightly over the ipc.max.pool.size() but the additional connections would timeout
after maxIdleTime - underlying PoolMap connections object is thread safe.

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