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Hadoop 2.x Administration Cookbook by Gurmukh Singh

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Diagnose communication issues

In this recipe, we will look at how to troubleshoot communication issues between nodes and how we can quickly find common errors.

Getting ready

To step through the recipe, the user must have completed the Setting up multi-node HBase cluster recipe in Chapter 9, HBase Administration and have gone through the previous recipes in this chapter. It is good to have a basic knowledge of the DNS and TCP communication.

How to do it...

  1. Connect to the master1.cyrus.com master node in the cluster and switch to user hadoop.
  2. The first thing is to check which connections are already established to the nodes. This can be seen with the following command, as shown here:
  3. Check the reachability of nodes in the cluster using the following commands ...

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