On Thu, Dec 10, 2009 at 2:05 AM, Ganesh <emailg...@yahoo.co.in> wrote:
> I think, This problem will happen for all sorted fields. I am sorting on
> integer field.
Integer field should take much less RAM than String, today, for
sorting. And there's no efficiency gained by doing this globally (per
segment is just fine).
> I ran small test and found after closing all the Database, the WeekHashMap
> and int[] are not released. Please find the profiler screenshot attached.
>
> Is there any way to release this memory / How to fix it externally with 2.9.1
> ?
GC will "eventually" reclaim it, but there is this issue in progress:
https://issues.apache.org/jira/browse/LUCENE-2135
to improve the immediacy, ie, on closing your reader, the FieldCache
entries will be reclaimed. (There's also an exciting LUCENE-2133 in
progress, with a good improvement to FieldCache, that'll fix the issue
even better).
> If we reopen the DB multiple times whether these objects will be accumulated
> / All readers are referenced to single cache?
They'll be GCd, as long as your app doesn't hold references to the old
readers. They're stored in a WeakHashMap, keyed by the IndexReader.
Mike
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