[jira] [Created] (LUCENE-4698) Overhaul ShapeFieldCache because its a memory pig

["David Smiley (JIRA)" <ji...@apache.org>]

David Smiley created LUCENE-4698:
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             Summary: Overhaul ShapeFieldCache because its a memory pig
                 Key: LUCENE-4698
                 URL: https://issues.apache.org/jira/browse/LUCENE-4698
             Project: Lucene - Core
          Issue Type: Improvement
          Components: modules/spatial
            Reporter: David Smiley


The org.apache.lucene.spatial.util.ShapeFieldCache* classes together implement a spatial field cache for points, similar to FieldCache for other fields.  It supports a variable number of points per document, and it's currently only used by the SpatialPrefixTree strategy because that's the only strategy that supports a variable number of points per document.  The other spatial strategies use the FieldCache.  The ShapeFieldCache has problems:
* It's a memory pig. Each point is stored as a Point object, instead of an array of x & y coordinates. Furthermore, each Point is in an ArrayList that exists for each Document. It's not done any differently when your spatial data isn't multi-valued.
* The cache is not per-segment, it's per-IndexReader, thereby making it un-friendly to NRT search.
* The cache entries don't self-expire optimally to free up memory. The cache is simply stored in a WeakHashMap<IndexReader,ShapeFieldCache>. The big cache entries are only freed when the WeakHashMap is used and the JVM realizes the IndexSearcher instance has been GC'ed.

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