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datastax-enterprise

What snitch am I running?

I recently ran;

sudo nodetool describecluster

and got the following output;

Snitch: org.apache.cassandra.locator.DynamicEndpointSnitch

Which confused me because in cassandra.yaml on each of my nodes, I have the following;

endpoint_snitch: GossipingPropertyFileSnitch

In fact - I can't even see

DynamicEndpointSnitch

as a valid option in the cassandra.yaml file.

Are the two the same thing? Am I just misinterpreting the output of nodetool?

As always - Thanks! -Gavin.

Solution

  • Cassandra's dynamic snitching feature wraps the snitch specified in the cassandra.yaml file with the DynamicEndpointSnitch. This snitch sorts endpoints by latency with an adapted phi failure detector thus providing a way to select the highest performing nodes for reads.