No Response from the Client When Submitting the MapReduce Application

Question

After the MapReduce task is submitted to the YARN server, the client is prompted without response for a long time.

Answer

For the above problem, ResourceManager provides the key diagnosis information of MapReduce operating status on the WebUI. For the MapReduce application that is submitted to the YARN, users can obtain the current application status and the reason to be in the status with the diagnosis information.

Procedures:

Log in to FusionInsight Manager, and select Cluster > Name of the desired cluster > Services > Yarn > ResourceManager(Active). Enter the WebUI, click the submitted MapReduce application on the WebUI of ResourceManager (Active), check the diagnosis information on the WebUI, and take measures according to the diagnosis information.

MapReduce logs offers immediate visibility into application running conditions. You can adjust application programs based on the logs.