[bulk load] Warn if bulk load director contained no files.
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Key: HBASE-4734
URL: https://issues.apache.org/jira/browse/HBASE-4734
Project: HBase
Issue Type: Improvement
Components: mapreduce
Affects Versions: 0.92.0, 0.94.0, 0.90.5
Reporter: Jonathan Hsieh
Bulk load exits if no files are found in the specified directory. This can
happen if a directory has been bulk loaded already (bulk load renames/moves
files). It would be good to provide some sort of warning when this happens.
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