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From "Sergey Shelukhin (JIRA)" <>
Subject [jira] [Commented] (HIVE-12995) LLAP: Synthetic file ids need collision checks
Date Wed, 03 Feb 2016 22:58:39 GMT


Sergey Shelukhin commented on HIVE-12995:

It might be easier to make cache support T as key, then use Long for HDFS and a struct for
other FSes. It might ever work with multiple FSes per cache easily, will definitely work with

> 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
> 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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