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From "Surbhi Mungre (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CRUNCH-494) Unable to union large number of PCollections
Date Thu, 29 Jan 2015 21:23:35 GMT
Surbhi Mungre created CRUNCH-494:
------------------------------------

             Summary: Unable to union large number of PCollections 
                 Key: CRUNCH-494
                 URL: https://issues.apache.org/jira/browse/CRUNCH-494
             Project: Crunch
          Issue Type: Bug
          Components: Core
    Affects Versions: 0.8.3
            Reporter: Surbhi Mungre
            Assignee: Josh Wills
            Priority: Minor


If you try to union large number of PCollections(~5K), then Crunch throws StackOverflowError
exception. 

{noformat}
java.lang.StackOverflowError
	at com.google.common.collect.AbstractIndexedListIterator.<init>(AbstractIndexedListIterator.java:68)
	at com.google.common.collect.AbstractIndexedListIterator.<init>(AbstractIndexedListIterator.java:54)
	at com.google.common.collect.Iterators$12.<init>(Iterators.java:1072)
	at com.google.common.collect.Iterators.forArray(Iterators.java:1072)
	at com.google.common.collect.RegularImmutableList.iterator(RegularImmutableList.java:68)
	at com.google.common.collect.RegularImmutableList.iterator(RegularImmutableList.java:31)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:291)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
	at org.apache.crunch.impl.dist.collect.PCollectionImpl.getTargetDependencies(PCollectionImpl.java:292)
{noformat}

Here is a simple test which can reproduce the issue. 
https://gist.github.com/anonymous/22f08511604341d0ffda




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