Similar to web interfaces available in the Hadoop 1.x version, the Hadoop 2.x version has web user interfaces for Hadoop services. Instead of the
JobTracker service web UI, the web UI for ResourceManager is used to monitor applications and resources. A detailed explanation regarding the configurations related to the web UI's is given in the next chapter.
The following screenshot refers to the web-interface of Hadoop HDFS. Through the HDFS interface, you can:
Explore the HDFS metrics
View the list of DataNodes connected to the NameNode
Browse the file system, and so on
A summarized view of the cluster resource capabilities
A list of applications related to the cluster
A list of NodeManager nodes connected
The scheduler details, and so on
You can refer to the
.pid files for the Hadoop daemons that are created in the
/tmp folder of your node. These files contain the current process...