[MAHOUT-839] rowid job failing (when parsing options)

• Type: Bug
• Status: Closed
• Priority: Trivial
• Resolution: Fixed
• Fix Version/s: 0.6
• Labels: options rowid
• Assignee: Grant Ingersoll
• Reporter: Dan Brickley
• Created: 11/Oct/11 14:34
• Updated: 09/Feb/12 14:00
• Resolved: 24/Oct/11 07:27

Description

Although MAHOUT-757 moved towards standard option naming, it uses different APIs for option parsing than other jobs.

On my system, it died reliably with null pointer error. Reported in mail here, but not reconfirmed by anyone else yet: http://permalink.gmane.org/gmane.comp.apache.mahout.user/9659

Example:

TellyClub:bin danbri$ ./mahout rowid --help

MAHOUT_LOCAL is set, so we don't add HADOOP_CONF_DIR to classpath.
MAHOUT_LOCAL is set, running locally

[skipping some hopefully unrelated SLF4J errors re same thing on classpath twice]

Exception in thread "main" java.lang.NullPointerException
at org.apache.hadoop.fs.Path.<init>(Path.java:61)
at org.apache.hadoop.fs.Path.<init>(Path.java:50)
at org.apache.mahout.utils.vectors.RowIdJob.run(RowIdJob.java:49)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
at org.apache.mahout.utils.vectors.RowIdJob.main(RowIdJob.java:89)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68)
at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139)
at org.apache.mahout.driver.MahoutDriver.main(MahoutDriver.java:188)