Help regarding no sql databases like hadoop, hbase etc

Posted by user560370 on Stack Overflow See other posts from Stack Overflow or by user560370
Published on 2011-01-02T16:34:31Z Indexed on 2011/01/03 16:54 UTC
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Filed under:

database

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memcached

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nosql

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hadoop

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hbase

I am new to the distributed NoSQL databases like Hadoop, Cassandra, etc. I have few questions for which I seek an expert advice:

Can you list problems/challenges one will generally face when making a shift from the present conventional database like MySQL to these large cluster-based databases?
What are the difficulties, if any, when one needs to adapt to a newer version of these open source projects?
Can you list out the things which are generally stored/kept in memcached for fast rendering of the page?
How can I understand the source code of open-source projects so that I can build on it and maybe give back to the community?

Above questions may sound to be idiotic and basic but please it's a request for the experts to answer the above questions in detailed and to best of their abilities.

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