GitHub user tgravescs opened a pull request:
https://github.com/apache/spark/pull/94
SPARK-1195: set map_input_file environment variable in PipedRDD
Hadoop uses the config mapreduce.map.input.file to indicate the input
filename to the map when the input split is of type FileSplit. Some of the
hadoop input and output formats set or use this config. This config can also be
used by user code.
PipedRDD runs an external process and the configs aren't available to that
process. Hadoop Streaming does something very similar and the way they make
configs available is exporting them into the environment replacing '.' with
'_'. Spark should also export this variable when launching the pipe command so
the user code has access to that config.
Note that the config mapreduce.map.input.file is the new one, the old one
which is deprecated but not yet removed is map.input.file. So we should handle
both.
Perhaps it would be better to abstract this out somehow so it goes into the
HadoopParition code?
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/tgravescs/spark map_input_file
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/94.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #94
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commit 2ba805ee7af681dce75d203816222779ccff45f2
Author: Thomas Graves <[email protected]>
Date: 2014-03-06T20:12:26Z
set map_input_file environment variable in PipedRDD
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