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From "Dyre Tjeldvoll (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-2114) Let Clock embed a HashMap rather than inherit from Hashtable
Date Thu, 23 Nov 2006 13:32:02 GMT
Let Clock embed a HashMap rather than inherit from Hashtable
------------------------------------------------------------

                 Key: DERBY-2114
                 URL: http://issues.apache.org/jira/browse/DERBY-2114
             Project: Derby
          Issue Type: Improvement
          Components: Performance
    Affects Versions: 10.2.1.6
            Reporter: Dyre Tjeldvoll
         Assigned To: Dyre Tjeldvoll
            Priority: Trivial
             Fix For: 10.3.0.0


Clock currently inherits from Hashtable, but the use of Hashtable is really an implementation
detail that would benefit from being hidden as private member. All access to the hashtable
happens inside sychronized blocks so it is safe to substitute a HashMap. This change appears
to trigger a small increase in throughput, as measured by the average TPS number obtained
by running the select client from DERBY-1961 repeatedly.

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