IndexReader.close should forcefully evict entries from FieldCache
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Key: LUCENE-2135
URL: https://issues.apache.org/jira/browse/LUCENE-2135
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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