Today I will talking at the Cassandra Summit Tokyo on upgrading Apache Cassandra.

The talk covers a little on why and when to upgrade, but spends most of the time discussion how to upgrade from Cassandra 1.2 to 2.0.

The slides are available here and the run book discussed is here.

The run book is meant to be a general approach for upgrading. If you grab it be sure to check back for updates.