Elasticsearch Node Performance | Metrics to Watch

by Nate Coppinger on March 24, 2020

The machine that runs your instance of Elasticsearch will indicate vital signs of performance. Eyes on the CPU, memory usage, and disk I/O will ensure optimal Elasticsearch node performance in production.

Elasticsearch node | CPU Performance

You may notice that your Elasticsearch instance can easily eat up CPU. CPU peaks are expected but underlying issues could be lurking. Whether it is clear performance issues or not, there will certainly be an opportunity for performance optimization. The Java Virtual Machine (JVM) indicators will likely coincide with the spikes in CPU you see in your Elasticsearch node performance. Match the spikes in JVM metrics with Elasticsearch node performance CPU to uncover the underlying cause.

JVM metrics, elasticserarch metics, cpu utilization, dashboard, Elasticsearch node performance Metrics to watch

Elasticsearch node | memory usage

It is particularly normal to expect no free memory on the machine running your Elasticsearch instance. This is not an indicator to panic because you want your machine to be utilizing all of the available memory. However, the cached memory availability is something to keep your eye on. If you see the cached memory is running low, then you can expect available RAM to be running low.

Elasticsearch memory used, dashboard, Elasticsearch node performance Metrics to watch

Elasticsearch node | disk I/O rate

When Elasticsearch is deployed as a search engine it is expected that disk I/O will be put to the test. When a reduction in disk I/O is materializing in the machine, underlying problems are present. Let this be a catalyst to troubleshoot what the culprit issue may be.

data i/0, dashboard, Elasticsearch node performance Metrics to watch

The ratio between read and write operations will vary based on the particular usage of Elasticsearch you have deployed. Depending on the ratio within the node, indexing and query performance could be sources of optimization.

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