Hi,

I just tried to follow Mahout In Action, 6.4.2 Running recommendations with
Hadoop

When I launch
 bin/hadoop jar ~/mahout/trunk/core/target/mahout-core-0.4-SNAPSHOT.job
 org.apache.mahout.cf.taste.hadoop.item.RecommenderJob
-Dmapred.input.dir=input/input.txt -Dmapred.output.dir=output --usersFile
input/users.txt --booleanData

It fails and the job's log contains many occurences of the following
exception. I do understand why the number format fails, but I don't
understand why it's attempting it in the first place....Anyone had success
running this example?

MapAttempt TASK_TYPE="MAP" TASKID="task_201008091547_0003_m_000000"
TASK_ATTEMPT_ID="attempt_201008091547_0003_m_000000_0" TASK_STATUS="FAILED"
FINISH_TIME="1281362639468" HOSTNAME="localhost"
ERROR="java\.lang\.NumberFormatException: For input string: \"1: 1664968\"
at
java\.lang\.NumberFormatException\.forInputString(NumberFormatException\.java:48)
at java\.lang\.Long\.parseLong(Long\.java:419)
at java\.lang\.Long\.parseLong(Long\.java:468)
at
org\.apache\.mahout\.cf\.taste\.hadoop\.similarity\.item\.CountUsersMapper\.map(CountUsersMapper\.java:40)
at
org\.apache\.mahout\.cf\.taste\.hadoop\.similarity\.item\.CountUsersMapper\.map(CountUsersMapper\.java:31)
at org\.apache\.hadoop\.mapreduce\.Mapper\.run(Mapper\.java:144)
at org\.apache\.hadoop\.mapred\.MapTask\.runNewMapper(MapTask\.java:621)
at org\.apache\.hadoop\.mapred\.MapTask\.run(MapTask\.java:305)
at org\.apache\.hadoop\.mapred\.Child\.main(Child\.java:170)

Many thanks,

Florent

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