Spark - Daemon


daemon in Spark

The daemon in Spark are the driver that starts the executors. See Spark - Cluster

The daemon in Spark are JVM running threads (known as core (or slot)

  • one driver = 1 JVM many core
  • one executor = 1 JVM many core

As the JVM has to startup and initialize certain data structures before it can begin running tasks, running more core is preferable as running more executors.

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