4.8.2. Invoke HAM application

Use the following command to invoke the HAM application:

/usr/lib/hadoop/monitor/ham.sh -conf hadoop-site.xml

This displays a GUI that lists the current values and state of the NameNode and Job Tracker.

You can use this GUI to trigger blocking and non-blocking HDFS operations.

Blocking operations will block until the NameNode has failed over. The blocking operations use the dfs.retry properties. Non-blocking operations will fail if the NameNode is down, but these operations start succeeding once the failover NameNode is live.


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