Status parameters of Decision Data Store nodes
The Decision Data Store (DDS) service manages the Cassandra cluster and stores decision management data in a Cassandra database. Use the following reference information to better understand the status parameters of DDS nodes.
The status parameters of DDS nodes are refreshed every 60 seconds.
For information on how to access the status parameters of a selected node, see Monitoring decision management services.
- Node ID
- The identification number of the node in the cluster.
Disk
- Disk usage
- The disk space used by Cassandra records on this node.
- Free disk space (/dev/xvda2)
- The free disk space that is allocated to this node.
Read
- Read latency (75th percentile)
- In 75 percent of read queries since the node was started, the read latency time has been equal to or less than the value of this parameter.
- Read throughput (moving average)
- The moving average of all the read queries from the last five minutes.
Write
- Write latency (75th percentile)
- In 75 percent of write queries since the node was started, the write latency time has been equal to or less than the value of this parameter.
- Write throughput (moving average)
- The moving average of all the write queries from the last five minutes.
Metrics
- Owns
- The percentage of Cassandra records that are stored on this node.