What is the default number of executors in Spark? - Big Data In Real World

What is the default number of executors in Spark?

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This is going to be a short post. 

Number of executors in YARN deployments

Spark.executor.instances controls the number of executors in YARN. By default, the number of executors is 2.

Number of executors in Standalone deployments

Spark standalone mode requires each application to run an executor on every node in the cluster, whereas with YARN, you choose the number of executors to use.

You can however control the number of cores available by each executor but spark.executor.cores and spark.cores.max.

Number of cores allocated will be spark.executor.cores or spark.cores.max if spark.executor.cores is greater than spark.cores.max.

Check out this post if you are interested in learning the default number of cores and amount of memory allocated to an application in Spark?

Big Data In Real World
Big Data In Real World
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What is the default number of executors in Spark?
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