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Posted to issues@carbondata.apache.org by "Ajantha Bhat (Jira)" <ji...@apache.org> on 2019/09/10 05:17:00 UTC

[jira] [Created] (CARBONDATA-3515) Limit local dictionary size to 10% of allowed blocklet size

Ajantha Bhat created CARBONDATA-3515:
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             Summary: Limit local dictionary size to 10% of allowed blocklet size
                 Key: CARBONDATA-3515
                 URL: https://issues.apache.org/jira/browse/CARBONDATA-3515
             Project: CarbonData
          Issue Type: Improvement
            Reporter: Ajantha Bhat


problem: currently local dictionary max size is 2GB, because of this for varchar columns or long string columns, local dictionary can be of 2GB size. so, as local dictionary is stored in blocklet. blocklet size will exceed 2 GB, even though configured maximum blocklet size is 64MB. some places inter overflow happens during casting.

 

solution: limit the local dictionary size to 10% of maximum allowed blocklet size



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