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Posted to issues@hive.apache.org by "Sergey Shelukhin (JIRA)" <ji...@apache.org> on 2016/03/01 03:05:18 UTC
[jira] [Commented] (HIVE-12995) LLAP: Synthetic file ids need
collision checks
[ https://issues.apache.org/jira/browse/HIVE-12995?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15173098#comment-15173098 ]
Sergey Shelukhin commented on HIVE-12995:
-----------------------------------------
Ok, now I'm working on this btw :)
> 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
>
> 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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