[ http://issues.apache.org/jira/browse/NUTCH-398?page=comments#action_12448053 ] Uros Gruber commented on NUTCH-398: -----------------------------------
Did anyone try to use single machine but not with local mode but with nutch acting like one node? Maybe this is workaround till bug is fixed. I need to recrawl about 800k urls and I'll report my timing. > 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. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Nutch-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/nutch-developers
