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From "Michael McCandless (JIRA)" <>
Subject [jira] Commented: (LUCENE-2135) IndexReader.close should forcefully evict entries from FieldCache
Date Tue, 08 Dec 2009 10:55:18 GMT


Michael McCandless commented on LUCENE-2135:

This is not unlike what we had to do in creating CloseableThreadLocal... that was another
case where  the underlying impl failed to free things as immediately as we'd like.

> IndexReader.close should forcefully evict entries from FieldCache
> -----------------------------------------------------------------
>                 Key: LUCENE-2135
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 3.1
> Spinoff of java-user thread "heap memory issues when sorting by a string field".
> We rely on WeakHashMap to hold our FieldCache, keyed by reader.  But this lacks immediacy
on releasing the reference, after a reader is closed.
> WeakHashMap can't free the key until the reader is no longer referenced by the app. And,
apparently, WeakHashMap has a further impl detail that requires invoking one of its methods
for it to notice that a key has just become only weakly reachable.
> To fix this, I think on IR.close we should evict entries from the FieldCache, as long
as the sub-readers are truly closed (refCount dropped to 0).

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