Sahil Takiar created HIVE-15546:
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Summary: Optimize Utilities.getInputPaths()
Key: HIVE-15546
URL: https://issues.apache.org/jira/browse/HIVE-15546
Project: Hive
Issue Type: Sub-task
Components: Hive
Reporter: Sahil Takiar
Assignee: Sahil Takiar
When running on blobstores (like S3) where metadata operations (like
listStatus) are costly, Utilities.getInputPaths() can add significant overhead
when setting up the input paths for an MR / Spark / Tez job.
The method performs a listStatus on all input paths in order to check if the
path is empty. If the path is empty, a dummy file is created for the given
partition. This is all done sequentially. This can be really slow when there
are a lot of empty partitions. Even when all partitions have input data, this
can take a long time.
We should either:
(1) Just remove the logic to check if each input path is empty, and handle any
edge cases accordingly.
(2) Multi-thread the listStatus calls
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