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From Chris Hostetter <hossman_luc...@fucit.org>
Subject Re: dangers of fieldcache
Date Thu, 16 Jun 2005 23:47:00 GMT

I don't have a commiter-bit, so i can't say for a fact that a patch like
this would/wouldn't be accepted, but it seems like a pretty simple
change...

1) add a "public void suggestRemove(IndexReader r)" method to
   FieldCache.java
2) add an implimentation of that method to FieldCacheImpl.java which calls
   cache.remove(r)

...even without a patch, you should be able to do the same thing by
writting your own subclass of FieldCacheImpl and assigning an
instance of it to FieldCache.DEFAULT before you open any IndexReaders.

BUT!

I would seriously question wether or not this is needed, i'm hard pressed
to think of any situation in which the GC wouldn't clean up those weak
refrences for you in a timely manner ... unless ... perhaps ... you still
have a hard refrence to your IndexReader somewhere that you aren't
noticing which you don't let go of for quite a while?



: Date: Wed, 15 Jun 2005 23:55:20 -0700
: From: John Wang <john.wang@gmail.com>
: Reply-To: java-user@lucene.apache.org, John Wang <john.wang@gmail.com>
: To: java-user@lucene.apache.org
: Subject: dangers of fieldcache
:
: Hi:
:
:    I am having some problems with the field cache.
:
:    My application keeps a reader in memory for a amount of time and
: then polls for a new reader, at which point a new reader is loaded
: into memory and the older reader is then closed.
:
:    However, after the reader is loaded, I do some operations such as
: sorting which implicitly makes use of and stores data into the default
: field cache, which lives in the static memory.
:
:    Now even if I close the reader, the huge amounts of data remains in
: the field cache. There isn't a way to flush or clear the fieldcache,
: one can only rely the GC do the right thing and pull the soft
: references from the WeekHashMap.
:
:    This is baaaaaaaaaaaaad for me.
:
:    Can an method to flush the cache be added to FieldCache? Or any
: other suggestions?
:
:     Please let me know, I can file a bug/enhancement for this.
:
: Thanks
:
: -John
:
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-Hoss


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