Gopal V created HIVE-12995:
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Summary: 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
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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