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From "Earwin Burrfoot (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2779) Use ReadWriteLock in RAMDirectory
Date Sun, 28 Nov 2010 08:54:37 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12964515#action_12964515
] 

Earwin Burrfoot commented on LUCENE-2779:
-----------------------------------------

My primary point was that you're not going to have contention in that place at all. Take these
100queries/s, turn them into 100reopens+commits/s, multiply by ten, and then _maybe_ you start
noticing _something_.

> Use ReadWriteLock 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
>
>
> 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. So I think ReadWriteLock
can be useful.
> Also, syncing around sizeInBytes is unnecessary IMO, since it's an AtomicLong ...
> I'll post a patch shortly.

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