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From "Teddy Choi (JIRA)" <>
Subject [jira] [Issue Comment Deleted] (HIVE-15988) LLAP: cache ORC ACID delete deltas
Date Wed, 08 Mar 2017 14:58:38 GMT


Teddy Choi updated HIVE-15988:
    Comment: was deleted

(was: The previous patch was based on a wrong base.)

> LLAP: cache ORC ACID delete deltas
> ----------------------------------
>                 Key: HIVE-15988
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: llap, Transactions
>            Reporter: Teddy Choi
>            Assignee: Teddy Choi
>         Attachments: HIVE-15988.1.patch
> HIVE-12631 implemented ORC ACID table support in LLAP. If we cache ACID delete delta
in LLAP, it will be faster.
> 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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