On Mar 31, 2010, at 1:55 PM, Ted Dunning wrote: > Empty clusters are not that uncommon with k-means if you specify too large a > value for k.
Still, it shouldn't be an error condition, right? > > Arshad, can you say more about what data you are clustering? > > On Wed, Mar 31, 2010 at 6:29 AM, Grant Ingersoll <[email protected]>wrote: > >> Can you share the parameters you used to get this? Does it happen every >> time? >> >> >> On Mar 29, 2010, at 11:53 PM, Arshad Khan wrote: >> >>> Hello All >>> >>> While using Mahout 0.3 KMeansDriver I am encountering an exception >>> indicating an empty cluster. This happens sometimes while re-running the >>> clustering on the same data set. Is there a way to prevent this error? >> The >>> exception trace is follows: >>> >>> java.lang.RuntimeException: Error in configuring object >>> at >>> >> org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:93) >>> at >>> org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64) >>> at >>> >> org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117) >>> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:354) >>> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307) >>> at >>> org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:176) >>> Caused by: java.lang.reflect.InvocationTargetException >>> at sun.reflect.GeneratedMethodAccessor39.invoke(Unknown Source) >>> at >>> >> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) >>> at java.lang.reflect.Method.invoke(Method.java:597) >>> at >>> >> org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:88) >>> ... 5 more >>> Caused by: java.lang.RuntimeException: Error in configuring object >>> at >>> >> org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:93) >>> at >>> org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64) >>> at >>> >> org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117) >>> at org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:34) >>> ... 9 more >>> Caused by: java.lang.reflect.InvocationTargetException >>> at sun.reflect.GeneratedMethodAccessor39.invoke(Unknown Source) >>> at >>> >> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) >>> at java.lang.reflect.Method.invoke(Method.java:597) >>> at >>> >> org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:88) >>> ... 12 more >>> Caused by: java.lang.IllegalStateException: Cluster is empty! >>> at >>> >> org.apache.mahout.clustering.kmeans.KMeansClusterMapper.configure(KMeansClusterMapper.java:73) >>> ... 16 more >>> >>> Thanks >>> Arshad >> >> -------------------------- >> Grant Ingersoll >> http://www.lucidimagination.com/ >> >> Search the Lucene ecosystem using Solr/Lucene: >> http://www.lucidimagination.com/search >> >> -------------------------- Grant Ingersoll http://www.lucidimagination.com/ Search the Lucene ecosystem using Solr/Lucene: http://www.lucidimagination.com/search
