[jira] [Created] (MAHOUT-1314) StreamingKMeansReducer throws NullPointerException when REDUCE_STREAMING_KMEANS is set to true

["Adi Haviv (JIRA)" <ji...@apache.org>]

Adi Haviv created MAHOUT-1314:
---------------------------------

             Summary: StreamingKMeansReducer throws NullPointerException when REDUCE_STREAMING_KMEANS is set to true
                 Key: MAHOUT-1314
                 URL: https://issues.apache.org/jira/browse/MAHOUT-1314
             Project: Mahout
          Issue Type: Bug
          Components: Clustering
    Affects Versions: 0.8
            Reporter: Adi Haviv
             Fix For: 0.9


when REDUCE_STREAMING_KMEANS option is set to true (-rskm) the reducer fails with NullPointerException.

the problem is in line 60 ( return input.getCentroid(); )
it should be input.getCentroid().clone();
similar to line 81.

full stack trace: 
java.lang.NullPointerException
	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:191)
	at org.apache.mahout.math.random.WeightedThing.<init>(WeightedThing.java:31)
	at org.apache.mahout.math.neighborhood.BruteSearch.searchFirst(BruteSearch.java:133)
	at org.apache.mahout.clustering.ClusteringUtils.estimateDistanceCutoff(ClusteringUtils.java:100)
	at org.apache.mahout.clustering.streaming.mapreduce.StreamingKMeansThread.call(StreamingKMeansThread.java:64)
	at org.apache.mahout.clustering.streaming.mapreduce.StreamingKMeansReducer.reduce(StreamingKMeansReducer.java:66)
	at org.apache.mahout.clustering.streaming.mapreduce.StreamingKMeansReducer.reduce(StreamingKMeansReducer.java:1)
	at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:176)
	at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:650)
	at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:418)
	at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:260)


it happens every time the REDUCE_STREAMING_KMEANS is set to true.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira