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Posted to dev@nutch.apache.org by "Andrzej Bialecki (JIRA)" <ji...@apache.org> on 2008/12/27 14:49:44 UTC
[jira] Commented: (NUTCH-398) map-reduce very slow when crawling on
single server
[ https://issues.apache.org/jira/browse/NUTCH-398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12659338#action_12659338 ]
Andrzej Bialecki commented on NUTCH-398:
-----------------------------------------
This is an old bug, and refers to an old Hadoop bug that is already fixed in newer versions.
> map-reduce very slow when crawling on single server
> ---------------------------------------------------
>
> Key: NUTCH-398
> URL: https://issues.apache.org/jira/browse/NUTCH-398
> Project: Nutch
> Issue Type: Bug
> Components: fetcher
> Affects Versions: 0.8.1
> Environment: linux and windows
> Reporter: AJ Chen
> Assignee: Andrzej Bialecki
> Fix For: 1.0.0
>
>
> This seems a bug and so I create a ticket here. I'm using nutch 0.9-dev to crawl web on one linux server. With default hadoop
> configuration (local file system, no distributed crawling), the Generator and Fetcher spend unproportional amount of time on map-reduce opearations. For example:
> 2006-11-01 20:32:44,074 INFO crawl.Generator - Generator: segment:
> crawl/segments/20061101203244
> ... (doing map and reduce for 2 hours )
> 2006-11-01 22:28:11,102 INFO fetcher.Fetcher - Fetcher: segment:
> crawl/segments/20061101203244
> ... (fetching 12 hours )
> 2006-11-02 11:15:10,590 INFO mapred.LocalJobRunner - 175383 pages, 16583
> errors, 3.8 pages/s, 687 kb/s,
> 2006-11-02 11:17:24,039 INFO mapred.LocalJobRunner - reduce > sort
> ... (but doing reduce>sort and reduce>duce for 8 hours )
> 2006-11-02 19:13:38,882 INFO crawl.CrawlDb - CrawlDb update: segment:
> crawl/segments/20061101203244
> Since it's crawling on a single machine, such slow map-reduce opearation is not expected.
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