[
https://issues.apache.org/jira/browse/CRUNCH-494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14297726#comment-14297726
]
Surbhi Mungre commented on CRUNCH-494:
--------------------------------------
I am using Crunch 0.8.3, however the test fails even with latest version of
Crunch with same exception but in a different method. It looks like recursion
is used at several places when trying to union PCollections therefore limiting
the number of PCollections which could be unioned.
{noformat}
java.lang.StackOverflowError
at java.util.HashMap$EntryIterator.<init>(HashMap.java:832)
at java.util.HashMap$EntryIterator.<init>(HashMap.java:832)
at java.util.HashMap.newEntryIterator(HashMap.java:846)
at java.util.HashMap$EntrySet.iterator(HashMap.java:950)
at java.util.AbstractMap.hashCode(AbstractMap.java:459)
at
org.apache.commons.lang.builder.HashCodeBuilder.append(HashCodeBuilder.java:881)
at org.apache.crunch.io.FormatBundle.hashCode(FormatBundle.java:119)
at
org.apache.commons.lang.builder.HashCodeBuilder.append(HashCodeBuilder.java:881)
at
org.apache.crunch.io.impl.FileSourceImpl.hashCode(FileSourceImpl.java:173)
at java.util.HashMap.getEntry(HashMap.java:344)
at java.util.HashMap.containsKey(HashMap.java:335)
at java.util.HashSet.contains(HashSet.java:184)
at
org.apache.crunch.impl.dist.collect.BaseInputCollection.waitingOnTargets(BaseInputCollection.java:70)
at
org.apache.crunch.impl.dist.collect.PCollectionImpl.waitingOnTargets(PCollectionImpl.java:217)
at
org.apache.crunch.impl.dist.collect.PCollectionImpl.waitingOnTargets(PCollectionImpl.java:217)
at
org.apache.crunch.impl.dist.collect.PCollectionImpl.waitingOnTargets(PCollectionImpl.java:217)
at
org.apache.crunch.impl.dist.collect.PCollectionImpl.waitingOnTargets(PCollectionImpl.java:217)
at
org.apache.crunch.impl.dist.collect.PCollectionImpl.waitingOnTargets(PCollectionImpl.java:217)
at
org.apache.crunch.impl.dist.collect.PCollectionImpl.waitingOnTargets(PCollectionImpl.java:217)
{noformat}
> 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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