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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (DERBY-698) Use Java 5 concurrent collections for better concurrency (rather than synchronized collections)
Date Tue, 12 Mar 2013 12:43:13 GMT

     [ https://issues.apache.org/jira/browse/DERBY-698?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Knut Anders Hatlen closed DERBY-698.
------------------------------------

    Resolution: Fixed

I'm closing this issue as fixed (with no particular fix version specified) since many fixes
to utilize java.util.concurrent classes have gone into Derby over time, solving the most pressing
issues found when profiling Derby on CMT machines. See for example the issues linked from
this issue. There may be more places where we could use them, but in that case we should file
more specific JIRA issues and track each of them separately.
                
>  Use Java 5 concurrent collections for better concurrency (rather than synchronized collections)
> ------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-698
>                 URL: https://issues.apache.org/jira/browse/DERBY-698
>             Project: Derby
>          Issue Type: Improvement
>          Components: Services
>            Reporter: David Van Couvering
>
> The new Java 5 concurrency utilities includes a set of concurrent collections that allow
for greater concurrency than the current synchronized collections we are using.  This could
provide performance improvements for Derby, particularly in CMT (chip multi-threading) architectures.
> See  http://java.sun.com/j2se/1.5.0/docs/api/java/util/concurrent/package-summary.html

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