Monday, November 28, 2011

Introducing run-modes to Virgil: support for embedded or remote cassandra instances

Since Virgil was originally developed as an embedded REST layer for the Cassandra Server, it ran as a daemon inside the server and performed operations directly against the CassandraServer classes. Running in a single JVM had some performance gains over a separate server that communicated over Thrift (either directly or via Hector) since operations didn't have to take a second hop across the network (with the associated marshalling/unmarshalling)

We had a request come in to add the ability to run Virgil against a remote Cassandra:

That seemed reasonable since there are a lot of existing cassandra clusters and users may just want to add a REST layer to support webapp/gui access or SOLR integration.

To support those cases, we added run-modes to the configuration:

Let us know what you think.

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