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.
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