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From "Varun Sharma (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-7295) Contention in HBaseClient.getConnection
Date Fri, 07 Dec 2012 00:05:20 GMT
Varun Sharma created HBASE-7295:
-----------------------------------

             Summary: 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


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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