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Posted to dev@nutch.apache.org by "Talat UYARER (JIRA)" <ji...@apache.org> on 2014/05/03 16:48:15 UTC

[jira] [Assigned] (NUTCH-1618) Turn speculative execution off for Fetching

     [ https://issues.apache.org/jira/browse/NUTCH-1618?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Talat UYARER reassigned NUTCH-1618:
-----------------------------------

    Assignee: Talat UYARER

> Turn speculative execution off for Fetching
> -------------------------------------------
>
>                 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
>            Assignee: 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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