python


Why there are more python processes than the number of cores in Spark?


I am running a pyspark job in ipython console. I set spark master as local[4]. So I expect one core for the driver, which should be a Java process, and the other three cores each runs a Python process. However, this the the screen shot of my top,
Why there are 16 python processes? Why isn't there only 3 python processes? If I remember right, 16 is the total number of cores on this server.
Take a look at here if you haven't done so.
You have decided to use four workers, each with one executor by default. However, one executor is running a few tasks, each of which is a python process.
An excellent explanation on the topic is given here.

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