Classic Dispatchers - I/O-bound

[Susmit07]

For I/O-bound tasks for our usecase such as pulling data from HDFS / s3 and uploading to s3 file system how to set dipatcher. Doc says the number below

my-dispatcher {
  # Dispatcher is the name of the event-based dispatcher
  type = Dispatcher
  # What kind of ExecutionService to use
  executor = "fork-join-executor"
  # Configuration for the fork join pool
  fork-join-executor {
    # Min number of threads to cap factor-based parallelism number to
    parallelism-min = 2
    # Parallelism (threads) ... ceil(available processors * factor)
    parallelism-factor = 2.0
    # Max number of threads to cap factor-based parallelism number to
    parallelism-max = 10
  }
  # Throughput defines the maximum number of messages to be
  # processed per actor before the thread jumps to the next actor.
  # Set to 1 for as fair as possible.
  throughput = 100
}

How we decide on the numbers (May be on some load tests) can we go ahead with default:

implicit val ec: ExecutionContext = system.dispatcher

[raboof]

I think leaving this out of your configuration and using the defaults is a great start.

[Susmit07]

Roger that !