Database Reference
In-Depth Information
Figure9-5.The StorageService unreachable nodes attribute
In the following sections, we see what features are available for monitoring and management in
this way via JMX, by package.
org.apache.cassandra.concurrent
This package houses Cassandra's threading and streaming functionality. As such, it is the home
of the Staged Event-Driven Architecture (SEDA) classes, the gossiper, the balancers, and the
classes that flush data in memtables.
Most of these MBeans allow you to view only attributes. If you are suspicious of data writing
problems or unbalanced node problems in your Cassandra ring, start here.
Because of the SEDA architecture, each stage in Cassandra is exposed as its own MBean. This
means you're able to quickly determine exactly how many objects are in a given stage at a given
time. The stages include:
▪ Anti-Entropy Stage
