To verify all nodes managed by YARN, issue the yarn node --list --all command.
The output of the command should list all worker nodes, and indicate 0 for all nodes when the Aster instance or any other YARN application is not up and running. For example:
# yarn node --list --all
16/06/01 17:19:02 INFO impl.TimelineClientImpl: Timeline service address: http://hrh015m1.labs.teradata.com:8188/ws/v1/timeline/
16/06/01 17:19:02 INFO client.RMProxy: Connecting to ResourceManager at hrh015m1.labs.teradata.com/10.25.214.24:8050
Total Nodes:3
Node-Id Node-State Node-Http-Address Number-of-Running-Containers
hrh015d3.labs.teradata.com:45454 RUNNING hrh015d3.labs.teradata.com:8042 0
hrh015d1.labs.teradata.com:45454 RUNNING hrh015d1.labs.teradata.com:8042 0
hrh015d2.labs.teradata.com:45454 RUNNING hrh015d2.labs.teradata.com:8042 0