Calling Cassie

Twitter continues open source pledge with Cassandra client Cassie

Chris Mayer
Twitter.1

Another Scala based tool is offered to the community by the social networking behemoth

Following on from offering their Scala version of Cascading in
Scalding
last month, social networking giant Twitter have continued with the
open source pledge by releasing Cassandra client Cassie onto
Github.

The announcement was made on Twitter’s developer blog last week
by Ryan King, exclaiming that the team were excited to be letting
the client into the wild for people to use. 

Cassie is a Finagle and Scala-based client that was forked from
Yammer architect Coda
Hale’s Github library
 created two years ago. Finagle, for those
unaware, is a rather useful JVM network stack for the
JVM that you can use to
build 
asynchronous Remote Procedure Call
(RPC) clients and servers in Java, Scala, or any JVM-hosted
language, nicely packaged into a rich set of protocol-independent
tools.

Twitter’s objective here is similar to Scalding, realising the
limitations they now face within their own testing environment and
seeking to change this by giving it to a large audience to play
about with. As King
states in the blog:

While it is certainly stable— we use it in
production to talk to a dozen clusters and over a thousand
Cassandra machines— it is currently limited to the features we use
in production and has a few rough edges.

NoSQL database Cassandra has quicky become one of the stalwarts
of the Apache Foundation, becoming increasingly important within
the Hadoop ecosystem as the charge towards Big Data occurs. After
rigourous testing from Twitter, it should be interesting to see
what variations the wider community offers for Cassie.

To use Cassie, you must have Java SE 6, Scala
2.8, Cassandra 0.8 or later and sbt 0.7. The documentation on Github
provides a handy step-by-step guide to getting the best out of
Cassie. The team say that using Cassie with straight up Java is
possible, but not easy at this stage (an issue they’re trying to
amend).

The way Twitter are going, this open source deal could be a
monthly giveaway.

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