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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NUTCH-2501) Take into account $NUTCH_HEAPSIZE when crawling using crawl script
Date Fri, 26 Jan 2018 08:56:00 GMT

    [ https://issues.apache.org/jira/browse/NUTCH-2501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16340743#comment-16340743
] 

ASF GitHub Bot commented on NUTCH-2501:
---------------------------------------

sebastian-nagel commented on a change in pull request #279: NUTCH-2501: Take NUTCH_HEAPSIZE
into account  when crawling using crawl script
URL: https://github.com/apache/nutch/pull/279#discussion_r164054172
 
 

 ##########
 File path: src/bin/crawl
 ##########
 @@ -171,6 +175,8 @@ fi
 
 CRAWL_PATH="$1"
 LIMIT="$2"
+JAVA_CHILD_HEAP_MB=`expr "$NUTCH_HEAP_MB" / "$NUM_TASKS"`
 
 Review comment:
   Why should the heap size depend on the number of reducers? For a large-scale crawl the
reducers will run independently on different nodes, ev. also sequentially if there are not
enough computing resources available. Since mapred.child.java.opts is also used for the map
tasks and it's often not possible to force a fix number of map tasks, it's better to define
the heap size per task (usually via mapreduce.map.java.opts and mapreduce.reduce.java.opts).

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> Take into account $NUTCH_HEAPSIZE when crawling using crawl script
> ------------------------------------------------------------------
>
>                 Key: NUTCH-2501
>                 URL: https://issues.apache.org/jira/browse/NUTCH-2501
>             Project: Nutch
>          Issue Type: Improvement
>            Reporter: Moreno Feltscher
>            Assignee: Lewis John McGibbney
>            Priority: Major
>




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