Resourcemanager troubleshooting

In this recipe, we will look at common Resourcemanager issues and how these can be addressed.

Getting ready

To step through the recipe in this section, make sure the users have completed the Setting up multi-node HBase cluster recipe in Chapter 9, HBase Administration.

How to do it…

Scenario 1: Resourcemanager daemon not starting.

1. The Resourcemanager, by default, will bind to port 80030 to 80033 and 8088. These ports can be configured in the yarn-site.xml file and you should make sure these are unique and not used by any other service. In our labs, we used the ports as shown in the following screenshot:
   
2. The listening ports can be seen by using the following command:

   $ netsta -tlpn
   

3. Look into the logs for any Bind Errors and make sure the hostname is resolvable. Check for both forward and reverse lookup:

   $ nslookup <resource_manager_host>
   

4. On Node Manager, the import ports are 8040, 8041, and 8042. These are used for scheduling, localization, and so on...