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https://issues.apache.org/jira/browse/NUTCH-1746?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13959929#comment-13959929
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Lewis John McGibbney commented on NUTCH-1746:
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I am keen to learn of the volume of input(s) to the Mappers to result in OOM.
Do you run with any specific values for _mapred.child.java.opts_ property (or
similar)?
> OutOfMemoryError in Mappers
> ---------------------------
>
> Key: NUTCH-1746
> URL: https://issues.apache.org/jira/browse/NUTCH-1746
> Project: Nutch
> Issue Type: Bug
> Components: generator, injector
> Affects Versions: 1.7
> Environment: Nutch running in local mode with 4M+ domains in
> domain-urlfilter.txt
> Reporter: Greg Padiasek
> Attachments: Generator.patch, Injector.patch
>
>
> Initially I found that Generator was throwing OutOfMemoryError exception no
> matter how much RAM I allocated to JVM. I fixed the problem by moving
> URLFilters, URLNormalizers and ScoringFilters to top-level class as
> singletons and re-using them in all Generator mapper instances.
> Then I found the same problem in Injector and applied analogical fix.
> Now it seems that this issue may be common in all Nutch Mapper
> implementations.
> I was wondering if it would it be possible to integrate this kind of change
> in the upstream code base and potentially update all vulnerable Mapper
> classes.
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