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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3092) Use java.util.concurrent in TransactionTable to improve scalability
Date Wed, 16 Dec 2009 20:40:18 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12791571#action_12791571
] 

Knut Anders Hatlen commented on DERBY-3092:
-------------------------------------------

Dyre, do you happen to remember the nature of the tests that hung when you tested the patch?

> Use java.util.concurrent in TransactionTable to improve scalability
> -------------------------------------------------------------------
>
>                 Key: DERBY-3092
>                 URL: https://issues.apache.org/jira/browse/DERBY-3092
>             Project: Derby
>          Issue Type: Improvement
>          Components: Store
>    Affects Versions: 10.3.1.4
>            Reporter: Dyre Tjeldvoll
>            Assignee: Knut Anders Hatlen
>         Attachments: xact-concept.diff, xact-concept.png
>
>
> Running scalability tests with the client and buffer manager from DERBY-2911 shows that
access to the TransactionTable.trans (a Hashtable) and XactFactory.tranId (a shared long)
are the next major sources of contention. 

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