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

["Sergey Shelukhin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-17006?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sergey Shelukhin updated HIVE-17006:
------------------------------------
    Attachment: HIVE-17006.WIP.patch

The work in progress patch, needs a lot of cleanup/etc., separating the code from the existing reader; as well as tests + cluster testing, but it already passed one q file test and the cache works :)

> 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.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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