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From "Karthick Sankarachary (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3673) Reduce HTable Pool Contention Using Concurrent Collections
Date Fri, 18 Mar 2011 22:21:29 GMT
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


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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