One of the most common question in any big data interview. The three modes are:
Standalone mode – This is Hadoop’s default mode that uses the local file system for both input and output operations. The main purpose of the standalone mode is debugging. It does not support HDFS and also lacks custom configuration required for mapred-site.xml, core-site.xml, and hdfs-site.xml files.
Pseudo-distributed mode – Also known as the single-node cluster, the pseudo-distributed mode includes both NameNode and DataNode within the same machine. In this mode, all the Hadoop daemons will run on a single node, and hence, the Master and Slave nodes are the same.
Fully distributed mode – This mode is known as the multi-node cluster wherein multiple nodes function simultaneously to execute Hadoop jobs. Here, all the Hadoop daemons run on different nodes. So, the Master and Slave nodes run separately.
Posted Date:- 2021-10-21 09:12:56
What is the use of the -compress-codec parameter?
Name the three modes in which you can run Hadoop.
Write the command used to copy data from the local system onto HDFS?
What are the different core methods of a Reducer?
Mention the core methods of Reducer.
When to use MapReduce with Big Data.
How do you deploy a Big Data solution?
How do you copy data from the local system onto HDFS?
What would happen if you store too many small files in a cluster on HDFS?
What does P-value signify about the statistical data?
What are the different Output formats in Hadoop?
How can Big Data add value to businesses?
Talk about the different tombstone markers used for deletion purposes in HBase.
Explain the core methods of a Reducer.
What are some of the data management tools used with Edge Nodes in Hadoop?
Define the Port Numbers for NameNode, Task Tracker and Job Tracker.
How is HDFS different from traditional NFS?
Explain the different features of Hadoop.
Name the different commands for starting up and shutting down Hadoop Daemons.
What is the purpose of the JPS command in Hadoop?
What makes the HDFS fault-tolerant?
Which command will help you find the status of blocks and FileSystem health?
How can you restart NameNode and all the daemons in Hadoop?
What are the two types of metadata that a NameNode server holds?
What are the sources of Unstructured data in Big Data?
Why is big data analytics important?
What are the differences between regular FileSystem and HDFS?
What are the three modes in which Hadoop can run?
What are the different vendor-specific distributions of Hadoop?
What are the different approaches to deal with Big Data?
Name some of the important tools useful for Big Data analytics.
How is big data analysis helpful in increasing business revenue?
Why is Hadoop used in Big Data analytics?
Are Hadoop and Big Data co-related?
What are the different types of Big Data?
What do you mean by commodity hardware?
Define HDFS and YARN, and talk about their respective components.
What are the 5 V’s in Big Data?
What do you know about the term “Big Data�