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https://issues.apache.org/jira/browse/PIG-1053?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12779181#action_12779181
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Ankit Modi commented on PIG-1053:
---------------------------------
This patch has an issue with custom comparators ( OrderBy) in Local Mode ( Does
not affect MapReduce mode ).
Details:
Pig uses custom Comparators by setting OutputKeyComparator to the
customComparator.class, and passing the jar path to JVM while starting the task.
In this new local mode a new JVM is not started. So hadoop does not have the
classpath of customComparator and fails.
A solution for the above problem would be to pass jarpath of customComparator
in the "classpath" argument to JVM running pig.
eg.
{code:title=CustomComparatorUse.pig}
register custom.jar
A = load 'file';
B = order A by * using custompackage.customclass; --- Here hadoop bails out
giving ClassNotFoundException
store B into 'file2'
{code}
JVM Command
{{java -cp pig.jar org.pig.apache.Main -x local CustomComparatorUse.pig # This
does not work}}
Use this instead
{{java -cp pig.jar:{color:red}custom.jar{color} org.pig.apache.Main -x local
CustomComparatorUse.pig}}
> Consider moving to Hadoop for local mode
> ----------------------------------------
>
> Key: PIG-1053
> URL: https://issues.apache.org/jira/browse/PIG-1053
> Project: Pig
> Issue Type: Improvement
> Reporter: Alan Gates
> Assignee: Ankit Modi
> Attachments: hadoopLocal.patch
>
>
> We need to consider moving Pig to use Hadoop's local mode instead of its own.
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