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From "Markus Jelsma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NUTCH-1113) Merging segments causes URLs to vanish from crawldb/index?
Date Wed, 08 Jan 2014 16:52:52 GMT

    [ https://issues.apache.org/jira/browse/NUTCH-1113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13865631#comment-13865631
] 

Markus Jelsma commented on NUTCH-1113:
--------------------------------------

No. We don't really seem to be losing records, but the wrong crawl_fetch survives the merge,
e.g.

1. fetched
2. not_modified
3. gone

And finally we end up with the thing as fetched after merging, indexing a gone record. 

> 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: NUTCH-1113-trunk.patch, 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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