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From "Martijn van Groningen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3360) Move FieldCache to IndexReader
Date Thu, 04 Aug 2011 09:09:27 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13079290#comment-13079290
] 

Martijn van Groningen commented on LUCENE-3360:
-----------------------------------------------

Good idea. Backporting this to Lucene 3.x seems like a good plan if we make a fake FieldCache.DEFAULT
impl that delgates to IR.
Yes, we should reuse the fieldcache in case of a reopen. I see that reopenSegement just instantiates
a new SegmentReader instance, so we can just pass the existing FieldCache instance to the
new SegementReader instance.

> Move FieldCache to IndexReader
> ------------------------------
>
>                 Key: LUCENE-3360
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3360
>             Project: Lucene - Java
>          Issue Type: Improvement
>            Reporter: Martijn van Groningen
>             Fix For: 3.4, 4.0
>
>
> Move the static FieldCache.DEFAULT field instance to atomic IndexReaders, so that FieldCache
insanity caused by the WeakHashMap no longer occurs.
> * Add a new method to IndexReader that by default throws an UOE:
> {code}public FieldCache getFieldCache(){code}
> * The SegmentReader implements this method and returns its own internal FieldCache implementation.
This implementation just uses a HashMap<Entry<T>,Object>> to store entries.
> * The SlowMultiReaderWrapper implements this method as well and basically behaves the
same as the current FieldCacheImpl.
> This issue won't solve the insanity that comes from inconsistent usage of a single field
(for example retrieve both int[] and DocTermIndex for the same field). 

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