[jira] [Commented] (NUTCH-1746) OutOfMemoryError in Mappers

["Lewis John McGibbney (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NUTCH-1746?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13959929#comment-13959929 ] 

Lewis John McGibbney commented on NUTCH-1746:
---------------------------------------------

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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