Hadoop Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Apache Hadoop (394)
MapReduce (354)
Apache Hive (345)
Apache Pig (225)

Apache Ambari (93)
Apache HCatalog (34)
Apache HDFS Hadoop Distributed File System (214)
Apache Kafka (189)

Hadoop Interview Questions

Questions Answers Views Company eMail

How to perform the inter-cluster data copying work in HDFS?

What are the main properties of hdfs-site.xml file?

Describe HDFS Federation?

What is active and passive NameNode in HDFS?

234

Does HDFS allow a client to read a file which is already opened for writing in hadoop?

How data or file is read in Hadoop HDFS?

How HDFS helps NameNode in scaling in Hadoop?

What is Fault Tolerance in Hadoop HDFS?

How can one copy a file into HDFS with a different block size to that of existing block size configuration?

What is a Block Scanner in HDFS?

101

Differentiate HDFS & HBase?

How data or file is written into Hadoop HDFS?

In HDFS, how Name node determines which data node to write on?

What is Secondary NameNode in Hadoop HDFS?

How to restart NameNode or all the daemons in Hadoop HDFS?

Un-Answered Questions { Hadoop }

Is cache an action in spark?

312

What is difference between cache and persist in spark?

291

What do you mean by consistency in Cassandra?

190

What is mahout hadoop?

How can you launch Spark jobs inside Hadoop MapReduce?

333

Explain about postgresql storage handler?

What is the use of combiners in the hadoop framework?

652

What are the file formats supported by spark?

315

What are the primary phases of a Reducer?

884

How to exit the vi editor?

778

What must we know to work on Zookeeper well?

What is executor memory and driver memory in spark?

298

What is the history of apache mahout? When did it start?

What do you understand about yarn?

309

What is apache spark core?

311

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