Hadoop Interview Questions

What are the default configuration files that are used in Hadoop

As of 0.20 release, Hadoop supported the following read-only default configurations - src/core/core-default.xml - src/hdfs/hdfs-default.xml - src/mapred/mapred-default.xml

How will you make changes to the default configuration files

Hadoop does not recommends changing the default configuration files, instead it recommends making all site specific changes in the following files - conf/core-site.xml - conf/hdfs-site.xml - conf/mapred-site.xml Unless explicitly turned off, Hadoop by default specifies two resources, loaded in-order from the classpath: - core-default.xml : Read-only defaults for hadoop. - core-site.xml: Site-specific configuration for a given hadoop installation. Hence if same configuration is defined in file core-default.xml and src/core/core-default.xml then the values in file core-default.xml (same is true for other 2 file pairs) is used.

Hadoop Interview Question

 Here are Some Hadoop Administration question you May expect.  answers you need to find.... :) i can give but i wont : if you find good answer share with me also :) hope you will right ? If you are not able to find let me know through comments i will post the answers too.

• What is Hadoop? Brief about the components of  Hadoop.

• What are the Hadoop daemon processes tell the components of Hadoop and functionality?

• Tell steps for configuring Hadoop?
• What is architecture of HDFS and flow?

• Can we have more than one configuration setting for Hadoop cluster how can you switch between these configurations?

• What will be your troubleshooting approach in Hadoop?
• What are the exceptions you have come through while working on Hadoop, what was your approach for getting rid of those exceptions or errors?