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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12995) LLAP: Synthetic file ids need collision checks
Date Wed, 09 Mar 2016 02:16:40 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12995?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15186344#comment-15186344
] 

Gopal V commented on HIVE-12995:
--------------------------------

Minor nit on the OrcBatchKey::equals() - fix before commit, please.

> LLAP: Synthetic file ids need collision checks
> ----------------------------------------------
>
>                 Key: HIVE-12995
>                 URL: https://issues.apache.org/jira/browse/HIVE-12995
>             Project: Hive
>          Issue Type: Bug
>          Components: llap
>    Affects Versions: 2.1.0
>            Reporter: Gopal V
>            Assignee: Sergey Shelukhin
>         Attachments: HIVE-12995.01.patch, HIVE-12995.patch
>
>
> LLAP synthetic file ids do not have any way of checking whether a collision occurs other
than a data-error.
> Synthetic file-ids have only been used with unit tests so far - but they will be needed
to add cache mechanisms to non-HDFS filesystems.
> In case of Synthetic file-ids, it is recommended that we track the full-tuple (path,
mtime, len) in the cache so that a cache-hit for the synthetic file-id can be compared against
the parameters & only accepted if those match.



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