[jira] [Created] (LUCENE-6841) LZ4 compression using too much CPU time

["Karl von Randow (JIRA)" <ji...@apache.org>]

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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