How to Check Hadoop Server Name?

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To check the Hadoop server name, you can open the Hadoop configuration files located in the conf directory of your Hadoop installation. Look for core-site.xml or hdfs-site.xml files where the server name will be specified. Additionally, you can also use the command "hdfs getconf -nnRpcAddresses" in the Hadoop terminal to retrieve the server name. This command will display the hostname and port number of the Hadoop NameNode.

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How to check Hadoop server name in Ubuntu?

To check the Hadoop server name in Ubuntu, you can follow these steps:

  1. Open a terminal window.
  2. Navigate to the Hadoop configuration directory by running the following command: cd /etc/hadoop
  3. List the contents of the directory to find the configuration files by running: ls
  4. Look for the core-site.xml file by running: cat core-site.xml
  5. In the output, look for the property fs.defaultFS. The value of this property will be the server name of your Hadoop cluster.


Alternatively, you can also check the /etc/hosts file to find the server name by running the following command:

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cat /etc/hosts


By following these steps, you should be able to find the server name of your Hadoop cluster in Ubuntu.


What is the tool to identify Hadoop server name?

One tool that can be used to identify the Hadoop server name is the Hadoop command line interface (CLI). By running the command hadoop dfsadmin -report, you can get information about the Hadoop cluster, including the server names. Alternatively, you can also check the Hadoop configuration files, such as core-site.xml and hdfs-site.xml, to find the server name.


What is the implication of changing Hadoop server name?

Changing the Hadoop server name can have several implications, including:

  1. Network configuration: Changing the server name may require updating network configuration settings to ensure that the server can still communicate with other nodes in the Hadoop cluster.
  2. Cluster coordination: Changing the server name could potentially disrupt the coordination and communication between nodes in the Hadoop cluster, impacting the overall performance and reliability of the system.
  3. Data consistency: If the server name change is not managed properly, it could lead to issues with data consistency and integrity within the Hadoop cluster.
  4. Security considerations: Changing the server name could affect security settings and access controls within the Hadoop cluster, potentially leaving it vulnerable to unauthorized access or data breaches.


Overall, changing the Hadoop server name should be carefully planned and executed to minimize potential disruptions and ensure the continued functionality and security of the cluster.


What is the configuration for setting up Hadoop server name?

The configuration for setting up a Hadoop server name involves updating the following properties in the Hadoop configuration files:

  1. In the core-site.xml file:
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<property>
  <name>fs.defaultFS</name>
  <value>hdfs://<server-name>:8020</value>
</property>
<property>
  <name>hadoop.tmp.dir</name>
  <value>/path/to/hadoop/tmp</value>
</property>


  1. In the hdfs-site.xml file:
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<property>
  <name>dfs.replication</name>
  <value>3</value>
</property>


  1. In the mapred-site.xml file:
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<property>
  <name>mapreduce.framework.name</name>
  <value>yarn</value>
</property>


  1. In the yarn-site.xml file:
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<property>
  <name>yarn.resourcemanager.hostname</name>
  <value><server-name></value>
</property>
<property>
  <name>yarn.nodemanager.aux-services</name>
  <value>mapreduce_shuffle</value>
</property>


Replace <server-name> with the actual hostname or IP address of your Hadoop server. Make sure to restart the Hadoop services after making these changes for the new server name to take effect.

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