Chapter 17. Distributed Execution

17.1. About Distributed Execution

JBoss Data Grid provides distributed execution through a standard JDK ExecutorService interface. Tasks submitted for execution are executed on an entire cluster of JBoss Data Grid nodes, rather than being executed in a local JVM.
JBoss Data Grid's distributed task executors can use data from JBoss Data Grid cache nodes as input for execution tasks. As a result, there is no need to configure the cache store for intermediate or final results. As input data in JBoss Data Grid is already load balanced, tasks are also automatically balanced, therefore there is no need to explicitly assign tasks to specific nodes.
In JBoss Data Grid's distributed execution framework:
  • Each DistributedExecutorService is bound to a single cache. Tasks submitted have access to key/value pairs from that particular cache if the task submitted is an instance of DistributedCallable.
  • Every Callable, Runnable, and/or DistributedCallable submitted must be either Serializable or Externalizable, in order to prevent task migration to other nodes each time one of these tasks is performed. The value returned from a Callable must also be Serializable or Externalizable.
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