Sushanth Sowmyan created HIVE-5011:
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Summary: Dynamic partitioning in HCatalog broken on external tables
Key: HIVE-5011
URL: https://issues.apache.org/jira/browse/HIVE-5011
Project: Hive
Issue Type: Bug
Components: HCatalog
Reporter: Sushanth Sowmyan
Assignee: Sushanth Sowmyan
Dynamic partitioning with HCatalog has been broken as a result of HCATALOG-500
trying to support user-set paths for external tables.
The goal there was to be able to support other custom destinations apart from
the normal "hive-style" partitions. However, it is not currently possible for
users to set paths for dynamic ptn writes, since we don't support any way for
users to specify "patterns"(like, say "${rootdir}/$v1.$v2/") into which writes
happen, only "locations", and the values for dyn. partitions are not known
ahead of time. Also, specifying a custom path messes with the way dynamic ptn.
code tries to determine what was written to where from the output committer,
which means that even if we supported patterned-writes instead of
location-writes, we still have to do some more deep diving into the output
committer code to support it.
Thus, my current proposal is that we honour writes to user-specified paths for
external tables *ONLY* for static partition writes - i.e., if we can determine
that the write is a dyn. ptn. write, we will ignore the user specification.
(Note that this does not mean we ignore the table's external location - we
honour that - we just don't honour any HCatStorer/etc provided additional
location - we stick to what metadata tells us the root location is.
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