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From "Arthur B (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NUTCH-2328) GeneratorJob does not generate anything on second run
Date Tue, 18 Oct 2016 16:06:58 GMT

    [ 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 commented on NUTCH-2328:
---------------------------------

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 to sync across the actual hbase 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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