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https://issues.apache.org/jira/browse/HIVE-12631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16210384#comment-16210384
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Prasanth Jayachandran commented on HIVE-12631:
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Filed HIVE-17834 to fix flaky triggers test
> LLAP IO: support ORC ACID tables
> --------------------------------
>
> Key: HIVE-12631
> URL: https://issues.apache.org/jira/browse/HIVE-12631
> Project: Hive
> Issue Type: Bug
> Components: llap, Transactions
> Reporter: Sergey Shelukhin
> Assignee: Teddy Choi
> Fix For: 3.0.0
>
> Attachments: HIVE-12631.1.patch, HIVE-12631.10.patch,
> HIVE-12631.10.patch, HIVE-12631.11.patch, HIVE-12631.11.patch,
> HIVE-12631.12.patch, HIVE-12631.13.patch, HIVE-12631.15.patch,
> HIVE-12631.16.patch, HIVE-12631.17.patch, HIVE-12631.18.patch,
> HIVE-12631.19.patch, HIVE-12631.2.patch, HIVE-12631.20.patch,
> HIVE-12631.21.patch, HIVE-12631.22.patch, HIVE-12631.23.patch,
> HIVE-12631.24.patch, HIVE-12631.25.patch, HIVE-12631.26.patch,
> HIVE-12631.27.patch, HIVE-12631.28.patch, HIVE-12631.29.patch,
> HIVE-12631.3.patch, HIVE-12631.30.patch, HIVE-12631.31.patch,
> HIVE-12631.4.patch, HIVE-12631.5.patch, HIVE-12631.6.patch,
> HIVE-12631.7.patch, HIVE-12631.8.patch, HIVE-12631.8.patch, HIVE-12631.9.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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