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From "AJ Chen (JIRA)" <j...@apache.org>
Subject [jira] Created: (NUTCH-398) map-reduce very slow when crawling on single server
Date Wed, 08 Nov 2006 00:28:51 GMT
map-reduce very slow when crawling on single server
---------------------------------------------------

                 Key: NUTCH-398
                 URL: http://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


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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