In this question, first explain NAS and HDFS, and then compare their features as follows:
1) Network-attached storage (NAS) is a file-level computer data storage server connected to a computer network providing data access to a heterogeneous group of clients. NAS can either be a hardware or software which provides services for storing and accessing files. Whereas Hadoop Distributed File System (HDFS) is a distributed filesystem to store data using commodity hardware.
2) In HDFS Data Blocks are distributed across all the machines in a cluster. Whereas in NAS data is stored on a dedicated hardware.
3) HDFS is designed to work with MapReduce paradigm, where computation is moved to the data. NAS is not suitable for MapReduce since data is stored separately from the computations.
4) HDFS uses commodity hardware which is cost-effective, whereas a NAS is a high-end storage devices which includes high cost.
Posted Date:- 2021-08-31 05:13:28
Write the command used to copy data from the local system onto HDFS?
Explain the usage of Context Object.
Whenever a client submits a hadoop job, who receives it?
What is a rack awareness and on what basis is data stored in a rack?
How can you skip the bad records in Hadoop?
What is the process to change the files at arbitrary locations in HDFS?
Where does Hive store the table data by default?
Explain about the process of inter cluster data copying.
What is the default replication factor?
Mention features of Apache sqoop.
What do you mean by SerDe in Hive? Explain.
Mention a business use case where you worked with the Hadoop Ecosystem
What is meant by over/under- replicated blocks in Hadoop?
Explain the difference between HBase and Hive.
Explain the three core methods of a reducer.
What are the Benefits of using zookeeper?
How can you restart the NameNode in Hadoop?
What makes Hadoop Fault tolerant?
How will you choose various file formats for storing and processing data using Apache Hadoop ?
What are the steps involved in deploying a big data solution?
What are the most commonly defined input formats in Hadoop?
What is the best hardware configuration to run Hadoop?
What are the main components of a Hadoop Application?
On what concept the Hadoop framework works?
What is the port number for NameNode?
Explain how data is stored in a rack.
Compare HDFS with Network Attached Storage (NAS).
What is meant by a block and block scanner?
What is indexing? How is indexing done in HDFS?
Explain the difference between HDFS and regular FileSystem.
What is shuffling in MapReduce?
What are the Limitations of Hadoop 1.0 ?
Name some companies that use Hadoop.
What are some limitations of Hadoop?
What are the three modes in which Hadoop runs?
How big data analysis helps businesses increase their revenue? Give example.
What do the four V’s of Big Data denote?
Explain the Storage Unit In Hadoop (HDFS).
What are the challenges faced with Big Data, and why do we use Hadoop for Big Data?