can not set usersFile as null when run
org.apache.mahout.cf.taste.hadoop.item.RecommenderJob
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Key: MAHOUT-351
URL: https://issues.apache.org/jira/browse/MAHOUT-351
Project: Mahout
Issue Type: Bug
Components: Collaborative Filtering
Affects Versions: 0.4
Reporter: Hui Wen Han
I want to get all users recommendations using RecommenderJob.
it seems need not set the usersFile parameters,
In Class:RecommenderMapper.java
String usersFilePathString = jobConf.get(USERS_FILE);
if (usersFilePathString == null) {
usersToRecommendFor = null;
} else {
usersToRecommendFor = new FastIDSet();
Path usersFilePath = new Path(usersFilePathString).makeQualified(fs);
FSDataInputStream in = fs.open(usersFilePath);
for (String line : new FileLineIterable(in)) {
usersToRecommendFor.add(Long.parseLong(line));
}
}
if ((usersToRecommendFor != null) &&
!usersToRecommendFor.contains(userID.get())) {
return;
}
but when I ｉnore userFile parameters ,get following error:
run job :
ra...@dan:~/app/steer/item$ hadoop
org.apache.mahout.cf.taste.hadoop.item.RecommenderJob
-Dmapred.job.name=HADOOP_REC_tap_tag\ -Dmapred.reduce.tasks=200 --input
/steer/item/in --tempDir /steer/item/temp --output /steer/item/out --jarFile
mahout-0.4-SNAPSHOT.jar --numRecommendations 10
Exception in thread "main" java.lang.NullPointerException
at java.util.Hashtable.put(Hashtable.java:394)
at java.util.Properties.setProperty(Properties.java:143)
at org.apache.hadoop.conf.Configuration.set(Configuration.java:403)
at
org.apache.mahout.cf.taste.hadoop.item.RecommenderJob.run(RecommenderJob.java:110)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
at
org.apache.mahout.cf.taste.hadoop.item.RecommenderJob.main(RecommenderJob.java:117)
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