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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2273) FieldCacheImpl's getCacheEntries() is buggy as it uses WeakHashMap incorrectly and leads to ConcurrentModExceptions
Date Sun, 21 Feb 2010 10:58:27 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12836353#action_12836353
] 

Michael McCandless commented on LUCENE-2273:
--------------------------------------------

Can we add @lucene.internal to this API as well?  Or lucene.experimental?

> FieldCacheImpl's getCacheEntries() is buggy as it uses WeakHashMap incorrectly and leads
to ConcurrentModExceptions
> -------------------------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-2273
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2273
>             Project: Lucene - Java
>          Issue Type: Bug
>            Reporter: Uwe Schindler
>            Assignee: Uwe Schindler
>             Fix For: 3.1
>
>
> The way how WeakHashMap works internally leads to the fact that it is not allowed to
iterate over a WHM.keySet() and then get() the value. As each get() operation inspects the
ReferenceQueue of the weak keys, they may suddenly disappear. If you use the entrySet() iterator
you get key and value and no need to call get(), contains(),... that inspects the ReferenceQueue.

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