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Posted to dev@nutch.apache.org by "Julien Nioche (JIRA)" <ji...@apache.org> on 2014/05/01 18:25:16 UTC

[jira] [Commented] (NUTCH-1618) Fetches some websites multiple times for long lasting queues

    [ https://issues.apache.org/jira/browse/NUTCH-1618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13986728#comment-13986728 ] 

Julien Nioche commented on NUTCH-1618:
--------------------------------------

Good catch! +1

> Fetches some websites multiple times for long lasting queues
> ------------------------------------------------------------
>
>                 Key: NUTCH-1618
>                 URL: https://issues.apache.org/jira/browse/NUTCH-1618
>             Project: Nutch
>          Issue Type: Bug
>          Components: fetcher
>    Affects Versions: 2.1, 2.2, 2.3, 2.4
>            Reporter: Talat UYARER
>            Priority: Minor
>             Fix For: 2.3
>
>         Attachments: NUTCH-1618.patch
>
>
> We are using nutch for high volume crawls. We noticed that FetcherJob ReduceTask fetches some websites multiple times for long lasting queues. I have discovered the reason of this is mapred.reduce.tasks.speculative.execution settings in hadoop. 1.x has speculative execution turned off. I create a patch for 2.x



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