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From Brian Hurt <>
Subject Closing the IndexSearcher/IndexWriter for a core
Date Mon, 03 Aug 2015 20:57:25 GMT
Is there are an easy way for a client to tell Solr to close or release the
IndexSearcher and/or IndexWriter for a core?

I have a use case where we're creating a lot of cores with not that many
documents per zone (a few hundred to maybe 10's of thousands).  Writes come
in batches, and reads also tend to be bursty, if less so than the writes.

And we're having problems with ram usage on the server.  Poking around a
heap dump, the problem is that every IndexSearcher or IndexWriter being
opened is taking up large amounts of memory.

I've looked at the unload call, and while it is unclear, it seems like it
deletes the data on disk as well.  I don't want to delete the data on disk,
I just want to unload the searcher and writer, and free up the memory.

So I'm wondering if there is a call I can make when I know or suspect that
the core isn't going to be used in the near future to release these objects
and return the memory?  Or a configuration option I can set to do so after,
say, being idle for 5 seconds?  It's OK for there to be a performance hit
the first time I reopen the core.



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