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
