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Posted to dev@nutch.apache.org by "Markus Jelsma (JIRA)" <ji...@apache.org> on 2014/01/08 14:13:55 UTC
[jira] [Commented] (NUTCH-1113) Merging segments causes URLs to
vanish from crawldb/index?
[ https://issues.apache.org/jira/browse/NUTCH-1113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13865400#comment-13865400 ]
Markus Jelsma commented on NUTCH-1113:
--------------------------------------
NUTCH-1616 is actually a duplicate of this issue and Edward's fix is better than the one i had attached. Will put up a patch for this issue.
> Merging segments causes URLs to vanish from crawldb/index?
> ----------------------------------------------------------
>
> Key: NUTCH-1113
> URL: https://issues.apache.org/jira/browse/NUTCH-1113
> Project: Nutch
> Issue Type: Bug
> Affects Versions: 1.3
> Reporter: Edward Drapkin
> Fix For: 1.9
>
> Attachments: merged_segment_output.txt, unmerged_segment_output.txt
>
>
> When I run Nutch, I use the following steps:
> nutch inject crawldb/ url.txt
> repeated 3 times:
> nutch generate crawldb/ segments/ -normalize
> nutch fetch `ls -d segments/* | tail -1`
> nutch parse `ls -d segments/* | tail -1`
> nutch update crawldb `ls -d segments/* | tail -1`
> nutch mergesegs merged/ -dir segments/
> nutch invertlinks linkdb/ -dir merged/
> nutch index index/ crawldb/ linkdb/ -dir merged/ (I forward ported the lucene indexing code from Nutch 1.1).
> When I crawl with merging segments, I lose about 20% of the URLs that wind up in the index vs. when I crawl without merging the segments. Somehow the segment merger causes me to lose ~20% of my crawl database!
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