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https://issues.apache.org/jira/browse/DERBY-2328?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Knut Anders Hatlen updated DERBY-2328:
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Attachment: derby-2328.stat
derby-2328.diff
derby-2328.diff removes the Hashtable in SinglePool. Derbyall and the JUnit
tests passed on Solaris 10/JDK6.
Description of the changes:
- New method in LockFactory: createCompatibilitySpace()
- New (almost empty) interface CompatibilitySpace to be returned from
createCompatibilitySpace()
- LockSpace implements CompatibilitySpace and is returned by
SinglePool.createCompatibilitySpace()
- SinglePool no longer extends Hashtable. Now it casts the supplied
compatibility space object to LockSpace and uses it directly.
- Modified signatures of all methods/variables that used compatibility spaces
(Object -> CompatibilitySpace)
- Modified code that assumed compatibility space objects were transaction
objects (virtual lock table and code that locked an object with the transaction
as lock group)
- Code that tested space1.equals(space2) was changed to (space1 == space2)
Because of the signature changes the patch grew quite big. Reviews would be
greatly appreciated. Thanks.
> Reduce monitor contention in SinglePool
> ---------------------------------------
>
> Key: DERBY-2328
> URL: https://issues.apache.org/jira/browse/DERBY-2328
> Project: Derby
> Issue Type: Sub-task
> Components: Performance, Services
> Affects Versions: 10.3.0.0
> Reporter: Knut Anders Hatlen
> Assigned To: Knut Anders Hatlen
> Priority: Minor
> Attachments: derby-2328.diff, derby-2328.stat, unused.diff
>
>
> When multiple threads enter the lock manager, there might be contention on
> SinglePool's monitor. The contention should be reduced in order to improve
> scalability.
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