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Fallout is an open-source distributed systems testing service that we use heavily at DataStax to run functional and performance tests for Apache Cassandra, Apache Pulsar, and other projects. Fallout automatically provisions and configures distributed systems and clients, runs a variety of workloads and benchmarks, and gathers test results for later analysis.
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Cassandra has a number of tools to understand what’s happening internally as it serves data to clients. A lot of this is tracked as metrics in monitoring tools such as Prometheus or Grafana which integrate with Fallout. Checking those metrics showed that request throughput (requests per second) dropped off to near zero whenever we triggered the bug. To understand what was happening on the server side, I waited for the bug to occur and then took a look at the output of nodetool tpstats.
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Grafana
The open and composable observability and data visualization platform. Visualize metrics, logs, and traces from multiple sources like Prometheus, Loki, Elasticsearch, InfluxDB, Postgres and many more.
Cassandra has a number of tools to understand what’s happening internally as it serves data to clients. A lot of this is tracked as metrics in monitoring tools such as Prometheus or Grafana which integrate with Fallout. Checking those metrics showed that request throughput (requests per second) dropped off to near zero whenever we triggered the bug. To understand what was happening on the server side, I waited for the bug to occur and then took a look at the output of nodetool tpstats.
