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Compressing Output #533

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calinburloiu opened this Issue Aug 1, 2013 · 4 comments

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@calinburloiu
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calinburloiu commented Aug 1, 2013

Currently, the output cannot be compressed in Scalding. The Hadoop configuration property mapred.output.compress is ignored, so setting it to true both thorough command line with -D mapred.output.compress=true or by overriding config method of Job class has no effect.

As noted in a post on cascading-user group, cascading's TextLine and TextDelimited override this property to false in JobConf.

@locked-fg

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locked-fg commented Sep 22, 2014

Sorry I don't get the merged PR / or the meaning of it:
should it work if I use 0.12.0rc3? Because I don't get it to work.
Currently I just use the classes from here: https://github.com/morazow/WordCount-Compressed

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Trevoke commented Apr 28, 2017

Is this still true?

@johnynek

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@gerashegalov

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gerashegalov commented May 9, 2017

FYI: it's still true due to using Cascading's default in a hard-coded way which #903 aimed to address.
Simple repro in REPL:

scalding> useHdfsLocalMode
scalding> customConfig.get("mapreduce.output.fileoutputformat.compress")
scalding> import com.twitter.scalding.source._
scalding> TypedPipe.from(List(1 -> 2, 3 -> 4)).save(TypedText.tsv("test"))
scalding> fsShell("-ls test")
Found 2 items
-rw-r--r--   3 user group          0 2017-05-09 21:46 test/_SUCCESS
-rw-r--r--   3 user grouo          8 2017-05-09 21:46 test/part-00000

scalding> fsShell("-cat test/*")
1       2
3       4
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