Sushanth Sowmyan created HIVE-7072:
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Summary: HCatLoader only loads first region of hbase table
Key: HIVE-7072
URL: https://issues.apache.org/jira/browse/HIVE-7072
Project: Hive
Issue Type: Bug
Affects Versions: 0.14.0
Reporter: Sushanth Sowmyan
Assignee: Sushanth Sowmyan
Pig needs a config parameter 'pig.splitCombination' set to 'false' for it to be
able to read HBaseStorageHandler-based tables.
This is done in the HBaseLoader at getSplits time, but HCatLoader does not do
so, which results in only a partial data load.
Thus, we need one more special case definition in HCat, that sets this
parameter in the job properties if we detect that we're loading a
HBaseStorageHandler based table. The primary issue is one of where this code
should go, since it doesn't belong in pig (pig does not know what loader
behaviour should be, and this parameter is its interface to a loader), and
doesn't belong in the HBaseStorageHandler either, since that's implementing a
HiveStorageHandler and is connecting up the two. Thus, this should belong to
HCatLoader. However, HCatLoader can't set it at an appropriate input-time,
since it does not have knowledge of what the underlying format is at the time
it needs to set that. Setting this parameter across the board results in poor
performance for HCatLoader, so it must only be set when using with HBase.
Thus, it belongs in the SpecialCases definition as that was created
specifically for these kinds of odd cases.
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