[hibernate-issues] [Hibernate-JIRA] Resolved: (HSEARCH-272) Improve contention on DirectoryProviders in lucene backend

[Sanne Grinovero (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-272?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sanne Grinovero resolved HSEARCH-272.
-------------------------------------

    Resolution: Fixed

> Improve contention on DirectoryProviders in lucene backend
> ----------------------------------------------------------
>
>                 Key: HSEARCH-272
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-272
>             Project: Hibernate Search
>          Issue Type: Improvement
>          Components: engine
>    Affects Versions: 3.1.0.Beta1
>            Reporter: Sanne Grinovero
>            Assignee: Sanne Grinovero
>             Fix For: 3.1.0.Beta2
>
>
> Currently the lucene backend doesn't acquire locks on DirectoryProvider(s) until needed, but releases them only at end of all work.
> So having a workqueue affecting DP A and B in this order:
> ABBB will have this locking:
> lockA, doA, lockB, doB,doB,doB, unlockA, unlockB.
> instead, this would be desirable:
> lockA, doA, unlockA, lockB, doB,doB,doB, unlockB
> Side-effect is that something like ABAB will be reordered to AABB (keeping correct order from a DP point of view).

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