Error: Python3.4 -> java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess failed with code 1

Find the correct path of installed python3:

which python3

Assume that the result is:

/usr/bin/python3

Include --python-bin argument with in your command:

python3 MovieRecommender.py --python-bin /usr/bin/python3 -r hadoop --items hdfs:///user/lim/u.data hdfs:///user/lim/u.item > test.txt

Create a ~/.mrjob.conf file with this content:

runners:  hadoop:    python_bin: /usr/bin/python3

Then run your program with this command:

python3 MovieRecommender.py -r hadoop --items hdfs:///user/lim/u.data hdfs:///user/lim/u.item > test.txt

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