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