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From "Teddy Choi (JIRA)" <>
Subject [jira] [Comment Edited] (HIVE-12631) LLAP: support ORC ACID tables
Date Wed, 08 Mar 2017 14:12:38 GMT


Teddy Choi edited comment on HIVE-12631 at 3/8/17 2:12 PM:

Applied changes in dynamic_semijoin_reduction_3.q in HIVE-16022.

was (Author: teddy.choi):
Applied changes in dynamic_semijoin_reduction_3.q in HIVE-15844.

> LLAP: support ORC ACID tables
> -----------------------------
>                 Key: HIVE-12631
>                 URL:
>             Project: Hive
>          Issue Type: Bug
>          Components: llap, Transactions
>            Reporter: Sergey Shelukhin
>            Assignee: Teddy Choi
>         Attachments: HIVE-12631.1.patch, HIVE-12631.2.patch, HIVE-12631.3.patch, HIVE-12631.4.patch,
HIVE-12631.5.patch, HIVE-12631.6.patch
> LLAP uses a completely separate read path in ORC to allow for caching and parallelization
of reads and processing. This path does not support ACID. As far as I remember ACID logic
is embedded inside ORC format; we need to refactor it to be on top of some interface, if practical;
or just port it to LLAP read path.
> Another consideration is how the logic will work with cache. The cache is currently low-level
(CB-level in ORC), so we could just use it to read bases and deltas (deltas should be cached
with higher priority) and merge as usual. We could also cache merged representation in future.

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