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https://issues.apache.org/jira/browse/NUTCH-2328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15585843#comment-15585843
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Arthur B edited comment on NUTCH-2328 at 10/18/16 4:17 PM:
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The environment that this was observed:
* spring batched jobs / spring data hadoop, submitting {{GeneratorJob}} M/R
jobs, so obviously the {{GeneratorReducer#count}} survived as static;
* in a pseudo-distributed Hadoop setup
Maybe I was missing something but the reason was cautious about making the
{{#count}} an instance member (from static) it was because this {{count}} value
would have to be seen across the whole Hadoop cluster, right? So that's why I
relied on the M/R counter ({{"GENERATE_MARK"}}) to sync across the Hadoop
cluster the actual pages counted as processed.
was (Author: arthur-evozon):
The environment that this was observed:
* spring batched jobs / spring data hadoop, submitting {{GeneratorJob}} M/R
jobs, so obviously the {{GeneratorReducer#count}} survived as static;
* in a pseudo-distributed Hadoop setup
Maybe I was missing something but the reason was cautious about making count
instance field because this counter would have to be seen across the whole
Hadoop cluster, right? So thats why I relied on the M/R counter
({{"GENERATE_MARK"}}) to sync across the Hadoop cluster the actual pages
counted as processed.
> GeneratorJob does not generate anything on second run
> -----------------------------------------------------
>
> Key: NUTCH-2328
> URL: https://issues.apache.org/jira/browse/NUTCH-2328
> Project: Nutch
> Issue Type: Bug
> Components: generator
> Affects Versions: 2.2, 2.3, 2.2.1, 2.3.1
> Environment: Ubuntu 16.04 / Hadoop 2.7.1
> Reporter: Arthur B
> Labels: fails, generator, subsequent
> Fix For: 2.4
>
> Attachments: generator-issue-static-count.patch
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> Given a topN parameter (ie 10) the GeneratorJob will fail to generate
> anything new on the subsequent runs within the same process space.
> To reproduce the issue submit the GeneratorJob twice one after another to the
> M/R framework. Second time will say it generated 0 URLs.
> This issue is due to the usage of the static count field
> (org.apache.nutch.crawl.GeneratorReducer#count) to determine if the topN
> value has been reached.
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