wangxu wrote:
> Have anybody thought of replacing CrawlDb with any kind of Rational
> DB,mysql,for example?
> 
> Crawldb is so difficult to manipulate.
> I often have the requirements to edit several entries in crawdb;
> But that would cost too much waiting for the mapReduce.

Please make the following test using your favorite relational DB:

* create a table with 300 mln rows and 10 columns of mixed type

* select 1 mln rows, sorted by some value

* update 1 mln rows to different values

If you find that these operations take less time than with the current 
crawldb then we will have to revisit this issue. :)


-- 
Best regards,
Andrzej Bialecki     <><
  ___. ___ ___ ___ _ _   __________________________________
[__ || __|__/|__||\/|  Information Retrieval, Semantic Web
___|||__||  \|  ||  |  Embedded Unix, System Integration
http://www.sigram.com  Contact: info at sigram dot com


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