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https://issues.apache.org/jira/browse/MAHOUT-351?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved MAHOUT-351.
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Resolution: Fixed
Fix Version/s: 0.4
I see, it seems that it's not allowed to set a conf parameter to null -- not
the same as not setting it. I easily fixed that with a check for null. Try it
now.
> can not set usersFile as null when run
> org.apache.mahout.cf.taste.hadoop.item.RecommenderJob
> --------------------------------------------------------------------------------------------
>
> 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
> Fix For: 0.4
>
>
> 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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