Spark - Daemon

Spark Cluster

About

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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Spark Cluster Tasks Slot
Spark - Core (Slot)

Cores (or slots) are the number of available threads for each executor (Spark daemon also ?) slotscoresDatabricks...
Spark Cluster
Spark - Driver

The driver is a (daemon|service) wrapper created when you get a spark context (connection) that look after the lifecycle of the Spark job. cluster managerapplication manager The driver: start as its...



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