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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2779) Use ConcurrentHashMap in RAMDirectory
Date Sun, 28 Nov 2010 17:21:37 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12964576#action_12964576
] 

Yonik Seeley commented on LUCENE-2779:
--------------------------------------

Anyway, you should be able to replace all the code in listAll with
{code}
  return (String[])fileMap.keySet().toArray();
{code}

The toArray() code of collection is smart and can handle the number of elements changing.

And for createOutput, replacing get() with remove() should be sufficient.

> 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.patch
>
>
> 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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