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

[Sanne Grinovero (JIRA)]

Improve contention on DirectoryProviders in lucene backend
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                 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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