Synthetic Transactions

Two types of Synthetic Transaction Metrics are collected on the Redis cluster – SLA metrics and local metrics.

SLA metrics are used by Instaclustr to provide a direct measure of the correct functioning of the system as seen by a client application. These metrics highlight if a client is unable to perform read/write operations on the Redis cluster. Rather than measuring if a specific node is unavailable, its purpose is to measure if read/writes are unavailable given the redundancy measures that Redis provides. Additionally, recording the latency of both read and write synthetic transactions will determine the quality-of-service of a Redis node.

On the other hand, for the purpose of troubleshooting, Local Metrics provide insights of individual master node performance. The synthetic read/write transactions are performed aiming each master node. These metrics help narrow down if a particular node is performing poorly.

Local Read Failed Operations: This metric shows number of failed read operations performed on the local node. Expected value: 0
Local Read Latency: This metric displays the average and maximum time taken in milliseconds by a client to read from its local node.
Local Read Successful Operations: This metric shows number of successful read operations performed on the local node. Every 20 seconds, 30 synthetic read transactions are performed on each node. Expected value: 30
Local Write Failed Operations: This metric shows number of failed write operations performed on the local node. Expected value: 0
Local Write Latency: This metric displays the average and maximum time taken in milliseconds by a client to write to its local node.
Local Write Successful Operations: This metric shows number of successful write operations performed on the local node. Every 20 seconds, 30 synthetic write transactions are performed on each node. Expected value: 30
SLA Read Failed Operations: This metric shows number of failed read operations performed on the cluster. Expected value: 0
SLA Read Latency: This metric displays the average and maximum time taken in milliseconds by a client to read from a random node in the cluster.
SLA Read Successful Operations: This metric shows number of successful read operations performed on the cluster. Every 20 seconds, 30 synthetic read transactions are performed on each node. Expected value: 30
SLA Write Failed Operations: This metric shows number of failed write operations performed on the cluster. Expected value: 0
SLA Write Latency: This metric displays the average and maximum time taken in milliseconds by a client to write to a random master node in the cluster.
SLA Write Successful Operations: This metric shows number of successful write operations performed on the cluster. Every 20 seconds, 30 synthetic write transactions are performed on each node. Expected value: 30