NullPointerException in RepresentativePointsMapper when running
cluster-reuters.sh example with kmeans
------------------------------------------------------------------------------------------------------
Key: MAHOUT-958
URL: https://issues.apache.org/jira/browse/MAHOUT-958
Project: Mahout
Issue Type: Bug
Components: Examples
Affects Versions: 0.6
Environment: {code}
> uname -a
Linux 3.2.1-3.fc16.x86_64 #1 SMP Mon Jan 23 15:36:17 UTC 2012 x86_64 x86_64
x86_64 GNU/Linux
{code}
{code}
> java -version
java version "1.7.0_02"
Java(TM) SE Runtime Environment (build 1.7.0_02-b13)
Java HotSpot(TM) 64-Bit Server VM (build 22.0-b10, mixed mode)
{code}
Hadoop Version: 0.20.203.0, r1099333
Reporter: Rares Vernica
{code}
> svn info
Path: .
URL: http://svn.apache.org/repos/asf/mahout/trunk
Repository Root: http://svn.apache.org/repos/asf
Repository UUID: 13f79535-47bb-0310-9956-ffa450edef68
Revision: 1235544
Node Kind: directory
Schedule: normal
Last Changed Author: tdunning
Last Changed Rev: 1231800
Last Changed Date: 2012-01-15 16:01:38 -0800 (Sun, 15 Jan 2012)
{code}
{code}
> ./examples/bin/cluster-reuters.sh
...
1. kmeans clustering
...
Inter-Cluster Density: NaN
Intra-Cluster Density: 0.0
CDbw Inter-Cluster Density: 0.0
CDbw Intra-Cluster Density: NaN
CDbw Separation: 0.0
12/01/24 16:08:47 INFO clustering.ClusterDumper: Wrote 20 clusters
12/01/24 16:08:47 INFO driver.MahoutDriver: Program took 126749 ms (Minutes:
2.1124833333333335)
{code}
All five "{{Representative Points Driver}}" jobs fail.
{code}
2012-01-24 16:07:11,555 INFO org.apache.hadoop.util.NativeCodeLoader: Loaded
the native-hadoop library
2012-01-24 16:07:11,881 INFO org.apache.hadoop.mapred.MapTask: io.sort.mb = 100
2012-01-24 16:07:11,896 INFO org.apache.hadoop.mapred.MapTask: data buffer =
79691776/99614720
2012-01-24 16:07:11,896 INFO org.apache.hadoop.mapred.MapTask: record buffer =
262144/327680
2012-01-24 16:07:11,956 INFO org.apache.hadoop.mapred.TaskLogsTruncater:
Initializing logs' truncater with mapRetainSize=-1 and reduceRetainSize=-1
2012-01-24 16:07:11,979 INFO org.apache.hadoop.io.nativeio.NativeIO:
Initialized cache for UID to User mapping with a cache timeout of 14400 seconds.
2012-01-24 16:07:11,979 INFO org.apache.hadoop.io.nativeio.NativeIO: Got
UserName vernica for UID 1000 from the native implementation
2012-01-24 16:07:11,981 WARN org.apache.hadoop.mapred.Child: Error running child
java.lang.NullPointerException
at
org.apache.mahout.clustering.evaluation.RepresentativePointsMapper.mapPoint(RepresentativePointsMapper.java:73)
at
org.apache.mahout.clustering.evaluation.RepresentativePointsMapper.map(RepresentativePointsMapper.java:60)
at
org.apache.mahout.clustering.evaluation.RepresentativePointsMapper.map(RepresentativePointsMapper.java:40)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:763)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:369)
at org.apache.hadoop.mapred.Child$4.run(Child.java:259)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
at org.apache.hadoop.mapred.Child.main(Child.java:253)
{code}
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