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From "Gunther Hagleitner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-17006) LLAP: Parquet caching
Date Thu, 31 Aug 2017 17:37:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-17006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16149305#comment-16149305
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Gunther Hagleitner commented on HIVE-17006:
-------------------------------------------

+1 pending test failures (insert_values_orig_table_use_metadata needs golden file update).

> 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
>         Attachments: HIVE-17006.01.patch, HIVE-17006.02.patch, HIVE-17006.03.patch, HIVE-17006.patch,
HIVE-17006.WIP.patch
>
>
> 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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