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From "Sergey Shelukhin (JIRA)" <>
Subject [jira] [Updated] (HIVE-12995) LLAP: Synthetic file ids need collision checks
Date Wed, 02 Mar 2016 01:40:18 GMT


Sergey Shelukhin updated HIVE-12995:
    Status: Patch Available  (was: Open)

Need to run it on the cluster just in case, but for now I am doing something else.

> LLAP: Synthetic file ids need collision checks
> ----------------------------------------------
>                 Key: HIVE-12995
>                 URL:
>             Project: Hive
>          Issue Type: Bug
>          Components: llap
>    Affects Versions: 2.1.0
>            Reporter: Gopal V
>            Assignee: Sergey Shelukhin
>         Attachments: 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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