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From Ahmed Elgohary <aagoh...@gmail.com>
Subject Inconsistent split cardinality in DistributedRowMatrix.times()
Date Sun, 02 Sep 2012 04:42:41 GMT
Hi,

I was multiplying two matrices using
DistributedRowMatrix.times(DistributedrowMatrix other). The two matrices
were of size 15x30 (small experiment on my local machine). I got the
following exception:

12/09/01 23:33:46 ERROR security.UserGroupInformation:
PriviledgedActionException as:ahmed cause:java.io.IOException: Inconsistent
split cardinality from child 1 (2/1)
Exception in thread "main" java.io.IOException: Inconsistent split
cardinality from child 1 (2/1)
    at org.apache.hadoop.mapred.join.Parser$CNode.getSplits(Parser.java:369)
    at
org.apache.hadoop.mapred.join.CompositeInputFormat.getSplits(CompositeInputFormat.java:117)
    at org.apache.hadoop.mapred.JobClient.writeOldSplits(JobClient.java:989)
    at org.apache.hadoop.mapred.JobClient.writeSplits(JobClient.java:981)
    at org.apache.hadoop.mapred.JobClient.access$600(JobClient.java:174)
    at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:897)
    at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:850)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:396)
    at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121)
    at
org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:850)
    at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:824)
    at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1261)
    at
org.apache.mahout.math.hadoop.DistributedRowMatrix.times(DistributedRowMatrix.java:189)
    at
baselines.ReconstructionError.clacReconstructionErr(ReconstructionError.java:45)
    at baselines.Main.runRandomSelection(Main.java:108)
    at baselines.Main.main(Main.java:154)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.hadoop.util.RunJar.main(RunJar.java:156)

Any idea what might be the reason of that error?

--ahmed

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