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https://issues.apache.org/jira/browse/NUTCH-1746?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13960327#comment-13960327
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Lewis John McGibbney commented on NUTCH-1746:
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bq. Does it matter when running in local mode?
No most likely not. I didn't realise you were running in local until I looked
into environment so thanks for that. :)
I think your suggestion is a valid one however I think we also need to analyse
the memory sucking aspect of regex. 4M is a suitably large input to justify
looking more closely in to this.
One question, are you able to post your regex-urlfilter file here so I can
reproduce? It's fine if you can't I can make one.
I wonder also if you have tried this with Automaton urlfilter?
> 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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