Empty clusters are not that uncommon with k-means if you specify too large a value for k.
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 > >
