Database Reference
In-Depth Information
view and manage services running in the system through a console known as the Services console. Hadoop daemons
are translated to Windows services in HDInsight distribution. To view the Hadoop services running on your cluster
head node, click on Start Run and type in Services.msc . This will launch the Services console, and you will see the
different Apache Hadoop-related services, as shown in Figure 6-17 .
Figure 6-17. Apache Hadoop Windows services
These services are unique to Hadoop on Windows, and Table 6-2 summarizes the function of each service.
Table 6-2. The Hadoop Windows services
Service
Function
Apache Hadoop Derbyserver
Runs the service for Hive's native embedded database technology called Derby
Apache Hadoop hiveserver
Simulates Hive's native thrift service for remote client connectivity
Apache Hadoop hiveserver2
Same as hiveserver with support for concurrency for ODBC and JDBC
Apache Hadoop isotopejs
Runs the required handlers for the interactive consoles that are available on the
HDInsight management portal
Apache Hadoop jobtracker
Runs the Hadoop job tracker service
Apache Hadoop metastore
Runs the Hive/Oozie metastore services
Apache Hadoop namenode
Runs the Hadoop NameNode service
Apache Hadoop oozieservice
Runs the Oozie service
Apache Hadoop templeton
Runs the Templeton service
Access to the services in Table 6-2 gives you control of the different programs you need to run on your Hadoop
cluster. If it is a really busy cluster doing only core MapReduce processing, you might want to stop the services for a
few supporting projects like Hive and Oozie, which are not used at that point.
Your Azure Management portal gives you an option to turn all Hadoop services on or off as a whole, as shown in
Figure 6-18 . However, through the name node's Services console, you can selectively turn off or on any of the services
you want.
 
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