What is the relationship between workers, worker instances, and executors?

Question

In Spark Standalone mode, there are master and worker nodes.

Here are few questions:

1. Does 2 worker instance mean one worker node with 2

Answer 1

I suggest reading the Spark cluster docs first, but even more so this Cloudera blog post explaining these modes.

Your first question depends on what you mean by 'instances'. A node is a machine, and there's not a good reason to run more than one worker per machine. So two worker nodes typically means two machines, each a Spark worker.

Workers hold many executors, for many applications. One application has executors on many workers.

Your third question is not clear.