[jira] [Commented] (SPARK-7898) pyspark merges stderr into stdout

["Sean Owen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-7898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14561631#comment-14561631 ] 

Sean Owen commented on SPARK-7898:
----------------------------------

I am not sure if the expectation should be the same. PySpark is doing a load of things as a process, one of which is executing python code that starts a process on some remote machine. I am not sure it's intended that PySpark's stderr, and stdout for that matter, parrot the stderr/stdout of this process.

> pyspark merges stderr into stdout
> ---------------------------------
>
>                 Key: SPARK-7898
>                 URL: https://issues.apache.org/jira/browse/SPARK-7898
>             Project: Spark
>          Issue Type: Bug
>          Components: PySpark
>    Affects Versions: 1.3.0
>            Reporter: Sam Steingold
>
> When I type 
> {code}
> hadoop fs -text /foo/bar/baz.bz2 2>err 1>out
> {code}
> I get two non-empty files: {{err}} with 
> {code}
> 2015-05-26 15:33:49,786 INFO  [main] bzip2.Bzip2Factory (Bzip2Factory.java:isNativeBzip2Loaded(70)) - Successfully loaded & initialized native-bzip2 library system-native
> 2015-05-26 15:33:49,789 INFO  [main] compress.CodecPool (CodecPool.java:getDecompressor(179)) - Got brand-new decompressor [.bz2]
> {code}
> and {{out}} with the content of the file (as expected).
> When I call the same command from Python (2.6):
> {code}
> from subprocess import Popen
> with open("out","w") as out:
>     with open("err","w") as err:
>         p = Popen(['hadoop','fs','-text',"/foo/bar/baz.bz2"],
>                   stdin=None,stdout=out,stderr=err)
> print p.wait()
> {code}
> I get the exact same (correct) behavior.
> *However*, when I run the same code under *PySpark* (or using `spark-submit`), I get an *empty* {{err}} file and the {{out}} file starts with the log messages above (and then it contains the actual data).



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