[jira] Resolved: (LUCENE-2779) Use ConcurrentHashMap in RAMDirectory

["Shai Erera (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-2779?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shai Erera resolved LUCENE-2779.
--------------------------------

    Resolution: Fixed

Committed revision 1041019 (3x).
Committed revision 1041039 (trunk).

Thanks all for the review !

> Use ConcurrentHashMap in RAMDirectory
> -------------------------------------
>
>                 Key: LUCENE-2779
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2779
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Store
>            Reporter: Shai Erera
>            Assignee: Shai Erera
>            Priority: Minor
>             Fix For: 3.1, 4.0
>
>         Attachments: LUCENE-2779-backwardsfix.patch, LUCENE-2779.patch, LUCENE-2779.patch, LUCENE-2779.patch, LUCENE-2779.patch, TestCHM.java
>
>
> RAMDirectory synchronizes on its instance in many places to protect access to map of RAMFiles, in addition to updating the sizeInBytes member. In many places the sync is done for 'read' purposes, while only in few places we need 'write' access. This looks like a perfect use case for ConcurrentHashMap
> Also, syncing around sizeInBytes is unnecessary IMO, since it's an AtomicLong ...
> I'll post a patch shortly.

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