simply about difficult
Suppose that we have an SBY application, which includes AppMaster and Container. When the container falls due to an exception, we need to send exception text to the AppMaster. When the container falls, the AppMaster’s onContainerFailed() method is automatically called: The method is in the StaticEventingAppmaster class. Your AppMaster must be inherited from it. We […]
READ MORELet’s say you need to get the name of hdfs cluster in an application. To do this, you need to get the org.apache.hadoop.conf.Configuration object: In the place we need, we get the fs.defaultFS property value:
READ MORELet’s say we need to terminate Spring Boot Yarn application due to checked exception. To do this, in the AppMaster class (it must be specified in the appmaster-class property in application.yml) we need to call the method in the place we need: If you need to stop the application from outside the AppMaster class, you can […]
READ MORESuppose, that we need to read the file from the Spring Boot Yarn application. We seem to have done everything right: placed the file next to the Yarn-client, Yarn-container and Yarn-appmaster jars; have used the File class, Files class, FileInputStream class and others. But for some reason we see exceptions like below: The problem is […]
READ MORESuppose you are using Spring Boot and you have a REST controller: At some point you need to connect the gRPC to the project without disabling REST controller. The gRPC code looks something like this: Then you find out that you can’t start REST server together with gRPC. gRPC will start, but REST will not. […]
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