Bikash Gupta created MAHOUT-1452:
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Summary: Kmeans unexpected behaviour after removal of file scheme
in output path for method mapreduce
Key: MAHOUT-1452
URL: https://issues.apache.org/jira/browse/MAHOUT-1452
Project: Mahout
Issue Type: Bug
Components: Clustering
Affects Versions: 0.9
Environment: CentOS, CDH4.6(3 Node Cluster)
Reporter: Bikash Gupta
Priority: Minor
Fix For: 1.0
Remove the hdfs scheme from output path, it will create clusters-0 in local
file system and clusters-1 in HDFS and after that it spits an error as it
expects clusters-0 to be in HDFS. Please check below stacktrace
2014-03-11 14:52:15 o.a.m.c.AbstractJob [INFO] Command line arguments:
{--clustering=null, --clusters=[/3/clusters-0-final], --convergenceDelta=[0.1],
--distanceMeasure=[org.apache.mahout.common.distance.EuclideanDistanceMeasure],
--endPhase=[2147483647], --input=[/2/sequence], --maxIter=[100],
--method=[mapreduce], --output=[/5], --overwrite=null, --startPhase=[0],
--tempDir=[temp]}
2014-03-11 14:52:15 o.a.h.u.NativeCodeLoader [WARN] Unable to load
native-hadoop library for your platform... using builtin-java classes where
applicable
2014-03-11 14:52:15 o.a.m.c.k.KMeansDriver [INFO] Input: /2/sequence Clusters
In: /3/clusters-0-final Out: /5
2014-03-11 14:52:15 o.a.m.c.k.KMeansDriver [INFO] convergence: 0.1 max
Iterations: 100
2014-03-11 14:52:16 o.a.h.m.JobClient [WARN] Use GenericOptionsParser for
parsing the arguments. Applications should implement Tool for the same.
2014-03-11 14:52:17 o.a.h.m.l.i.FileInputFormat [INFO] Total input paths to
process : 3
2014-03-11 14:52:19 o.a.h.m.JobClient [INFO] Running job: job_201403111332_0011
2014-03-11 14:52:20 o.a.h.m.JobClient [INFO] map 0% reduce 0%
2014-03-11 14:52:28 o.a.h.m.JobClient [INFO] Task Id :
attempt_201403111332_0011_m_000000_0, Status : FAILED
2014-03-11 14:52:28 STDIO [ERROR] java.lang.IllegalStateException: /5/clusters-0
at
org.apache.mahout.common.iterator.sequencefile.SequenceFileDirValueIterable.iterator(SequenceFileDirValueIterable.java:78)
at
org.apache.mahout.clustering.classify.ClusterClassifier.readFromSeqFiles(ClusterClassifier.java:208)
at
org.apache.mahout.clustering.iterator.CIMapper.setup(CIMapper.java:44)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:138)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:672)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:330)
at org.apache.hadoop.mapred.Child$4.run(Child.java:268)
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:1438)
at org.apache.hadoop.mapred.Child.main(Child.java:262)
Caused by: java.io.FileNotFoundException: File /5/clusters-0
If you provide HDFS uri in output then it works like a charm.
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