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I'm a fan of the NoSql movement and have been exploring Cassandra as an option for data storage.

I had a conversation with an engineer who works at a pretty well-known company here in SV and their sys admins are dropping Cassandra and pushing all the engineers back to MySql. I don't know the whole story but it seemed to be implied that open-sourced Cassandra had issues and supposedly Facebook had a much different version they were using.

Of course this is all second hand, so I tried to search on the experiences of other people using Cassandra (with decent volume). Unfortunately most of the threads I found had people just like me, at the exploratory stage. Or they hadn't been live with it for long.

If there were any pitfalls or hairy parts with maintain Cassandra, that would be good to know. Also, examples of clients who have decent load and have been using it for a while.



> their sys admins are dropping Cassandra and pushing all the engineers back to MySql

I'm curious what you are thinking of, because I have better picture of companies using Cassandra than most. :)

I do know of one company that fits your description, where some of the mysql DBAs were very anti-cassandra because, frankly, it's not mysql and that's what they were used to. But that has been resolved (the most vocal DBA left) and the Cassandra migration is continuing.

> If there were any pitfalls or hairy parts with maintain Cassandra, that would be good to know

Other than the obvious (it's not a relational database), we've documented the main limitations here: http://wiki.apache.org/cassandra/CassandraLimitations




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