The Mahout command script doesn't properly run when Hadoop is installed but
$MAHOUT_JOB is not set or found in standard locations
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Key: MAHOUT-426
URL: https://issues.apache.org/jira/browse/MAHOUT-426
Project: Mahout
Issue Type: Bug
Affects Versions: 0.4
Environment: Manifested in Amazon EC2 instance set up according to
wiki instructions - https://cwiki.apache.org/MAHOUT/mahoutec2.html
Seems likely to affect any server where Hadoop is installed
Reporter: Peter Goldstein
In the case where no $MAHOUT_JOB is set, and no mahout-examples-*.job file is
found in the standard locations, the Mahout command script should default to
the run locally option. Instead, when the script is run one received an error
that the non-existent file "$MAHOUT_HOME/mahout-examples-*.job" cannot be found.
This is the result of two separate bugs in the Mahout command script:
i) There is no existence check in the loop checking for mahout-examples-*.job
files in $MAHOUT_HOME
ii) The execution if/else clause only checks if either $HADOOP_CONF_DIR or
$HADOOP_HOME is empty when determining whether to run locally. It also should
check the $MAHOUT_JOB variable, as it is meaningless to run hadoop in this case.
Fixing these two issues allowed me to (almost) run the
$MAHOUT_HOME/examples/bin/build-reuters.sh script.
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