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From "zhangxihua (JIRA)" <j...@apache.org>
Subject [jira] Commented: (NUTCH-702) Lazy Instanciation of Metadata in CrawlDatum
Date Sat, 19 Sep 2009 07:21:16 GMT

    [ https://issues.apache.org/jira/browse/NUTCH-702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12757637#action_12757637
] 

zhangxihua commented on NUTCH-702:
----------------------------------

I used NUTCH1.1 Integrated in Nutch-trunk #929,but still outmemory.
java.lang.OutOfMemoryError: Java heap space
        at java.util.Arrays.copyOf(Unknown Source)
        at java.util.ArrayList.ensureCapacity(Unknown Source)
        at java.util.ArrayList.add(Unknown Source)
        at org.apache.nutch.crawl.CrawlDbReducer.reduce(CrawlDbReducer.java:97)
        at org.apache.nutch.crawl.CrawlDbReducer.reduce(CrawlDbReducer.java:35)
        at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:436)
        at org.apache.hadoop.mapred.Child.main(Child.java:158)

> Lazy Instanciation of Metadata in CrawlDatum
> --------------------------------------------
>
>                 Key: NUTCH-702
>                 URL: https://issues.apache.org/jira/browse/NUTCH-702
>             Project: Nutch
>          Issue Type: Improvement
>    Affects Versions: 1.0.0
>            Reporter: Julien Nioche
>             Fix For: 1.1
>
>         Attachments: NUTCH-702.patch, NUTCH-702.patch.v2, NUTCH-702v3.patch
>
>
> CrawlDatum systematically instanciates its metadata, which is quite wasteful especially
in the case of CrawlDBReducer when it generates a new CrawlDatum for each incoming link before
storing it in a List.
> Initial testing on the lazy instanciation shows an improvement in both speed and memory
consumption. I will generate a patch for it ASAP

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