Karl von Randow created LUCENE-6841:
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Summary: LZ4 compression using too much CPU time
Key: LUCENE-6841
URL: https://issues.apache.org/jira/browse/LUCENE-6841
Project: Lucene - Core
Issue Type: Bug
Components: core/codecs
Affects Versions: 5.3.1
Environment: Linux, Java 8
Reporter: Karl von Randow
I am using Lucene for search indexing, including storing a large number of
small fields, and some larger plain text fields, and searching using both exact
matches and analyzed queries.
LZ4 (specifically the decompress method) is using nearly exactly 50% of the
application's CPU time.
It seems to me that LZ4 is inappropriate for my use case. I note that I can
choose BEST_SPEED or BEST_COMPRESSION.
Would it be palatable to add a NO_COMPRESSION option, or some way to pick and
choose which fields get compressed? Perhaps a minimum length of a field could
be specified before it's compressed? I'm not sure if that's possible.
If this approach, or similar is palatable, I would be happy to contribute a
patch (or to consume and test a patch).
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