[jira] [Commented] (NUTCH-2177) Generator produces only one partition even in distributed mode

["Markus Jelsma (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NUTCH-2177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15029015#comment-15029015 ] 

Markus Jelsma commented on NUTCH-2177:
--------------------------------------

There seems to be no value for mapred.job.tracker on our own Yarn 2.7.1, probably why we are not suffering from this issue. 

> Generator produces only one partition even in distributed mode
> --------------------------------------------------------------
>
>                 Key: NUTCH-2177
>                 URL: https://issues.apache.org/jira/browse/NUTCH-2177
>             Project: Nutch
>          Issue Type: Bug
>          Components: generator
>            Reporter: Julien Nioche
>            Priority: Blocker
>             Fix For: 1.11
>
>
> See [https://github.com/apache/nutch/blob/trunk/src/java/org/apache/nutch/crawl/Generator.java#L542]
> 'mapred.job.tracker' is deprecated and has been replaced by 'mapreduce.jobtracker.address', however when running Nutch on EMR mapreduce.jobtracker.address has local as a value. As a result we generate a single partition i.e. have a single map fetching later on (which defeats the object of having a distributed crawler).
> We should probably detect whether we are running on YARN instead, see [http://stackoverflow.com/questions/29680155/why-there-is-a-mapreduce-jobtracker-address-configuration-on-yarn]



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