How to realize the concurrency of Storm Topology

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1 Storm distinguishes the topologies that run for a century in a Storm cluster according to the following three main parts:

1: worker

2:Executor (Thread)

3:tasks

The following figure simply illustrates their relationship. Okay, this is a repeatedly published structure diagram:

For the above, a Task, that is:

An Executor is a thread generated by a worker process that may be running one of the same components Spout and bolt or

Multiple task

A task performs actual data processing, and each spout or bolt you implement in code is equivalent to many task distributed throughout the cluster.

In the life cycle of 1 topology, the number of task of 1 component is always the same, but the number of executor (threads) of 1 component can be changed over time.

Change from time to time. This means that the following conditions are always true: the number of thread