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Apache Mahout Essentials by Jayani Withanawasam

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Monitoring Hadoop

Apache Hadoop daemons can be monitored using different mechanisms.

Commands/scripts

The running JVMs related to Hadoop can be displayed using the following command (use the correct Java installation location):

/usr/lib/jvm/java-7-oracle/bin/jps

The outcome of the preceding command is given in the following figure:

Commands/scripts

Data nodes

Active data nodes in the cluster can be displayed using the following command:

[Hadoop installation directory]/bin/hdfs dfsadmin –report

The outcome of the preceding command for a cluster with two data nodes is shown in the following figure:

Node managers

Active node managers can be monitored using the following ...

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