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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Created: (CASSANDRA-874) System tests against multiple nodes
Date Wed, 10 Mar 2010 19:11:27 GMT
System tests against multiple nodes
-----------------------------------

                 Key: CASSANDRA-874
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-874
             Project: Cassandra
          Issue Type: Test
          Components: Tools
            Reporter: Jonathan Ellis


We have a system test suite (see http://wiki.apache.org/cassandra/HowToContribute ) but it
only runs against the local machine, which is suboptimal even if we didn't have a bunch of
optimizations to make writes to a local node skip most of the messaging layer.

We'd like to automate testing against a whole cluster.  Paul has some code using libcloud
to do stress tests against an ephemeral rackspace cloud servers cluster at http://github.com/pquerna/ccb,
which is probably useful as a starting point, but rather than running stress.py you'd want
to put together a more comprehensive suite, based on the existing system tests but also explicitly
covering things like range queries that span multiple nodes and failure conditions like Hinted
Handoff (see http://wiki.apache.org/cassandra/HintedHandoff ) and repair (http://wiki.apache.org/cassandra/ArchitectureAntiEntropy
) resulting from deliberately disabling a node temporarily.

Adding tests for ops tasks like http://wiki.apache.org/cassandra/Operations would be awesome
too.

Finally, CASSANDRA-561 might make something like this possible using a simulator instead of
hardware-level virtualization, which would be both more convenient and less expensive.  But
someone just dumped a huge zip in our laps w/o really trying to collaborate with us there,
so if you want to try to resurrect that code or otherwise go that route, be more open about
what you're doing. :)

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