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https://issues.apache.org/jira/browse/HIVE-12598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15045499#comment-15045499
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Sergey Shelukhin commented on HIVE-12598:
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The cache does not work without fileId; that can be a large perf hit. Using a
synthetic fileId is safe if you never overwrite files in place; or, you might
be ok with the miniscule chance of collision. Perhaps I should also add date to
the generation.
> LLAP: disable fileId when not supported
> ---------------------------------------
>
> Key: HIVE-12598
> URL: https://issues.apache.org/jira/browse/HIVE-12598
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HIVE-12598.patch
>
>
> There is a TODO somewhere in code. We might get a synthetic fileId in absence
> of the real one in some cases when another FS masquerades as HDFS, we should
> be able to turn off fileID support explicitly for such cases as they are not
> bulletproof.
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