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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-2114) Let Clock embed a HashMap rather than inherit from Hashtable
Date Fri, 13 Apr 2007 07:12:15 GMT

     [ https://issues.apache.org/jira/browse/DERBY-2114?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Knut Anders Hatlen updated DERBY-2114:
--------------------------------------

    Derby Info:   (was: [Patch Available])

I verified that all callers of getCurrentSizeNoSync() are synchronized on Clock and that all
tests passed. Committed revision 528370. Perhaps it would be good to add comments to getCurrentSize()
and getCurrentSizeNoSync() to make it clear when to use which method?

> Let Clock embed a HashMap rather than inherit from Hashtable
> ------------------------------------------------------------
>
>                 Key: DERBY-2114
>                 URL: https://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
>
>         Attachments: derby-2114.currentsize.v1.diff, derby-2114.currentsize.v1.stat,
derby-2114.v1.diff, derby-2114.v1.stat, derby-2114.v2.diff, derby-2114.v2.stat
>
>
> 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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