[jira] Updated: (NUTCH-180) Performance problem with widely used keywords

["Mike Alulin (JIRA)" <ji...@apache.org>]

     [ http://issues.apache.org/jira/browse/NUTCH-180?page=all ]

Mike Alulin updated NUTCH-180:
------------------------------

    Component: searcher

> Performance problem with widely used keywords
> ---------------------------------------------
>
>          Key: NUTCH-180
>          URL: http://issues.apache.org/jira/browse/NUTCH-180
>      Project: Nutch
>         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 objectssearch.com 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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