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https://issues.apache.org/jira/browse/NUTCH-1746?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14004545#comment-14004545
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Julien Nioche commented on NUTCH-1746:
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Hi Greg
Thanks for investigating this. Your suggestion to use Configuration.toString()
makes sense and I think we should commit this. Better to define the identity
based on the K/V as done by Configuration.toString() and not on the instances.
We need to look into why multiple Configuration are being passed to ObjectCache
: my guess is that it happens only in local mode. The same JVM is used to run
all the mappers and reducers and it could be that a duplication of the Config
object is done at some point. There might be clarifications / improvements on
the use of NutchConfiguration.getUUID in PluginRepository and why it is not
using ObjectCache.
Thanks again!
> 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
> Fix For: 1.9
>
> Attachments: Generator.patch, Injector.patch, ObjectCache.patch,
> domain-urlfilter-aa, domain-urlfilter-ab, domain-urlfilter-ac
>
>
> 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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