variable substitution does not work in pig for properties in mapred-site.xml,
core-site.xml, etc.
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Key: PIG-2452
URL: https://issues.apache.org/jira/browse/PIG-2452
Project: Pig
Issue Type: Bug
Affects Versions: 0.8.1
Reporter: Ido Hadanny
Priority: Minor
create a property that depends on variable substitution, like:
<property>
<name>mapred.job.tracker</name>
<value>${local.jobtracker}:8021</value>
</property>
and pig will throw java.net.URISyntaxException.
Code digging shows that the probable cause is
HExecutionEngine.recomputeProperties, which uses Configuration.iterator().
Instead we should use Configuration.get(), which calls substituteVars.
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