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From "Markus Jelsma (JIRA)" <>
Subject [jira] [Closed] (NUTCH-180) Performance problem with widely used keywords
Date Fri, 01 Apr 2011 14:31:06 GMT


Markus Jelsma closed NUTCH-180.

    Resolution: Won't Fix

Bulk close of legacy issues:

> Performance problem with widely used keywords
> ---------------------------------------------
>                 Key: NUTCH-180
>                 URL:
>             Project: Nutch
>          Issue Type: Wish
>          Components: searcher
>            Reporter: Mike Alulin
> It looks like Nutch is very slow when the search phrase includes a few widely used keywords.
For example "I 1 2 3 4 5 6 7 8 9 0" typed without the quotes to Yahoo, Google, or MSN is processed
in less than a second. Nutch on the other hand requires much more time for this even on smaller
databases. For example this phrase made think more than 1 minute although
their DB is much smaller than DBs of the big 3 guys. On my test Nutch DB with only 3M pages
this phrase took a few seconds to process.
> Unfortunately I do not know much about search algorithms, but it looks like Nutch do
have some space to improve the search performance. The current implementation can be easily
"killed" by a few search requests like this. Just a couple of dozen of such requests makes
my server with 2 Opterons think for a minute or two with 100% CPU utilization.

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