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https://issues.apache.org/jira/browse/PIG-1273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12840483#action_12840483
 ] 

Ankur commented on PIG-1273:
----------------------------

Complete stack trace of the error thrown my 3rd M/R job in the pipeline

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$OldOutputCollector.(MapTask.java:448)
        at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358)
        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
        at org.apache.hadoop.mapred.Child.main(Child.java:159)
Caused by: java.lang.reflect.InvocationTargetException
        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.ReflectionUtils.setJobConf(ReflectionUtils.java:88)
        ... 6 more
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: Empty 
samples file
        at 
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.partitioners.SkewedPartitioner.configure(SkewedPartitioner.java:128)
        ... 11 more
Caused by: java.lang.RuntimeException: Empty samples file
        at 
org.apache.pig.backend.hadoop.executionengine.util.MapRedUtil.loadPartitionFile(MapRedUtil.java:128)
        at 
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.partitioners.SkewedPartitioner.configure(SkewedPartitioner.java:125)
        ... 11 more


> Skewed join throws error 
> -------------------------
>
>                 Key: PIG-1273
>                 URL: https://issues.apache.org/jira/browse/PIG-1273
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.6.0
>            Reporter: Ankur
>
> When the sampled relation is too small or empty then skewed join fails.

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