Wednesday, 03 February 2016

The return of the Cassandra CacheStore

Ever since we spruced up our Cache Store SPI in Infinispan 6.0, some of our "extra" cache stores have lied in a state of semi-abandonment, waiting for a kind soul with time and determination to bring them back to life. I’m glad to announce that such a kind soul, in the form of Jakub Markos, had the necessary qualities to accomplish the resurrection of the Cassandra Cache Store.

Apache Cassandra is a database with a distributed architecture which can be used to provide a virtually unlimited, horizontally scalable persistent store for Infinispan’s caches. The new Cassandra Cache Store leverages the Datastax Cassandra client driver instead of the old Thrift client approach, which makes it much more robust and reliable.

Configuration

In order to use this cache store you need to add the following dependency to your project:

You will also need to create an appropriate keyspace on your Cassandra database, or configure the auto-create-keyspace to create it automatically. The following CQL commands show how to configure the keyspace manually (using cqlsh for example):

You then need to add an appropriate cache declaration to your infinispan.xml (or whichever file you use to configure Infinispan):

It is important the the shared property on the cassandra-store element is set to true because all the Infinispan nodes will share the same Cassandra cluster.

Limitations

The cache store uses Cassandra’s own expiration mechanisms (time to live = TTL) to handle expiration of entries. Since TTL is specified in seconds, expiration lifespan and maxIdle values are handled only with seconds-precision.

In addition to this, when both lifespan and maxIdle are used, entries in the cache store effectively behave as if their lifespan = maxIdle, due to an existing bug https://issues.jboss.org/browse/ISPN-3202.

So, try it out and let us know about your experience !

Posted by Tristan Tarrant on 2016-02-03
Tags: persistence cassandra cache store

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