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Compressed text formats currently require entire compressed files be read into memory to be decompressed in a single call to the decompression codec. This changes the HdfsTextScanner to drive gzip in a streaming mode, i.e. produce partial output as input is consumed. Change-Id: Id5c0805e18cf6b606bcf27a5df4b5f58895809fd Reviewed-on: http://gerrit.sjc.cloudera.com:8080/5233 Reviewed-by: Matthew Jacobs <mj@cloudera.com> Tested-by: jenkins (cherry picked from commit 05c3cc55e7a601d97adc4eebe03f878c68a33e56) Reviewed-on: http://gerrit.sjc.cloudera.com:8080/5385