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Posted to dev@hive.apache.org by "Sergey Shelukhin (JIRA)" <ji...@apache.org> on 2017/06/30 21:37:00 UTC

[jira] [Created] (HIVE-17006) LLAP: Parquet caching

Sergey Shelukhin created HIVE-17006:
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             Summary: LLAP: Parquet caching
                 Key: HIVE-17006
                 URL: https://issues.apache.org/jira/browse/HIVE-17006
             Project: Hive
          Issue Type: Bug
            Reporter: Sergey Shelukhin
            Assignee: Sergey Shelukhin


There are multiple options to do Parquet caching in LLAP:
1) Full elevator (too intrusive for now).
2) Page based cache like ORC (requires some changes to Parquet or copy-pasted).
3) Cache disk data on column chunk level as is.

Given that Parquet reads at column chunk granularity, (2) is not as useful as for ORC, but still a good idea. I messaged the dev list about it but didn't get a response, we may follow up later.

For now, do (3). 





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