Shulou(Shulou.com)06/01 Report--

This article mainly introduces "what is StandaloneAppClient". In daily operation, I believe many people have doubts about what StandaloneAppClient is. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful for you to answer the doubts about "what is StandaloneAppClient?" Next, please follow the editor to study!

What is StandaloneAppClient? This is easy to get confused. In fact, StandaloneAppClient is not SparkApplication, it is mainly used in ScheduleBackend.

In a stand-alone cluster environment, ScheduleBackend uses StandaloneScheduleBackend, which inherits the CoarseGrainedSchedulerBackend class.

StandaloneScheduleBackend uses a class called StandaloneAppClient, this StandaloneAppClient is very confusing, in fact, its main function is to replace the resource application method of CoarseGrainedSchedulerBackend, instead of applying for resources from Master, let's take a look at the relevant code snippets.

Let's take a look at when he starts:

Private def tryRegisterAllMasters (): array [JFutur [_]] = {for (masterAddress

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