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https://issues.apache.org/jira/browse/LUCENE-2779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12965300#action_12965300
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Uwe Schindler commented on LUCENE-2779:
---------------------------------------

Earwin: I wanted to say the same. 

JRockit and Harmony are broken, Sun JVM is correct. So remove the code and only 
use toArray(). We cannot work around bugs in non-oficially-supported JVMs (IBM 
wants to go away from JRocket, too).

> 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, 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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