Spark - Daemon

Spark Cluster


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.

Discover More
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...

Share this page:
Follow us:
Task Runner