Michael McCandless created LUCENE-7071:
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Summary: Can we reeduce excessive byte[] copying in OfflineSorter?
Key: LUCENE-7071
URL: https://issues.apache.org/jira/browse/LUCENE-7071
Project: Lucene - Core
Issue Type: Improvement
Reporter: Michael McCandless
Assignee: Michael McCandless
Fix For: master, 6.1
OfflineSorter, which dimensional points uses heavily in the > 1D case,
works by reading one partition, a set of N unsorted values, from disk
and sorting it in memory and writing it out again.
The sort invokes a provided {{Comparator}} on two {{BytesRef}} values,
each of which is fully copied from the {{ByteBlockPool}}, when it could
often reference a slice from the pool instead.
Another byte[] copy happens when iterating through the sorted values.
This is an optimization ... I'm targeting 6.1.0 not 6.0.0!
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