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From "Earwin Burrfoot (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2779) Use ReadWriteLock in RAMDirectory
Date Thu, 25 Nov 2010 17:50:14 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12935813#action_12935813
] 

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

Using RWLock is needless.
synchronized performs pretty nice on modern JVMs
to at least some get contention on RAMDir you need to index+reopen gazillion times a second
- not a likely scenario. Usual searching doesn't hit any of these locks
that's premature optimization, imo

> 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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