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Posted to dev@lucene.apache.org by "Adrien Grand (JIRA)" <ji...@apache.org> on 2015/10/28 23:16:27 UTC

[jira] [Created] (LUCENE-6863) Store sparse doc values more efficiently

Adrien Grand created LUCENE-6863:
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             Summary: Store sparse doc values more efficiently
                 Key: LUCENE-6863
                 URL: https://issues.apache.org/jira/browse/LUCENE-6863
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Adrien Grand
            Assignee: Adrien Grand


For both NUMERIC fields and ordinals of SORTED fields, we store data in a dense way. As a consequence, if you have only 1000 documents out of 1B that have a value, and 8 bits are required to store those 1000 numbers, we will not require 1KB of storage, but 1GB.

I suspect this mostly happens in abuse cases, but still it's a pity that we explode storage requirements. We could try to detect sparsity and compress accordingly.



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