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From Don Smith <dsm...@likewise.com>
Subject RE: General questions about Cassandra
Date Fri, 17 Feb 2012 15:35:25 GMT
Are there plans to build-in some sort of map-reduce framework into Cassandra and CQL?   It
seems that users should be able to apply a Java method to selected rows in parallel  on the
distributed Cassandra JVMs.   I believe Solandra uses such an integration.

 Don
________________________________________
From: Alessio Cecchi [alessio@skye.it]
Sent: Friday, February 17, 2012 4:42 AM
To: user@cassandra.apache.org
Subject: General questions about Cassandra

Hi,

we have developed a software that store logs from mail servers in MySQL,
but for huge enviroments we are developing a version that store this
data in HBase. Raw logs are, once a day, first normalized, so the output
is like this:

username,date of login, IP Address, protocol
username,date of login, IP Address, protocol
username,date of login, IP Address, protocol
[...]

and after inserted into the database.

As I was saying, for huge installation (from 1 to 10 million of logins
per day, keep for 12 months) we are working with HBase, but I would also
consider Cassandra.

The advantage of HBase is MapReduce which makes searching the logs very
fast by splitting the "query" concurrently on multiple hosts.

Query will be launched from a web interface (will be few requests per
day) and the search keys are user and time range.

But Cassandra seems less complex to manage and simply to run, so I want
to evaluate it instead of HBase.

My question is, can also Cassandra split a "query" over the cluster like
MapReduce? Reading on-line Cassandra seems fast in insert data but
slower than HBase to "query". Is it really so?

We want not install Hadoop over Cassandra.

Any suggestion is welcome :-)

--
Alessio Cecchi is:
@ ILS ->  http://www.linux.it/~alessice/
on LinkedIn ->  http://www.linkedin.com/in/alessice
Assistenza Sistemi GNU/Linux ->  http://www.cecchi.biz/
@ PLUG ->  ex-Presidente, adesso senatore a vita, http://www.prato.linux.it
@ LOLUG ->  Socio http://www.lolug.net


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