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

Explain write ahead log(journaling) in spark?

284

Explain values() operation in apache spark?

529

Define the level of parallelism and its need in spark streaming?

404

Define sparksession in apache spark? Why is it needed?

289

Describe different transformations in dstream in apache spark streaming?

323

In hadoop_pid_dir, what does pid stands for?

571

What are the network requirements for hadoop?

521

What does hadoop-env.sh do?

483

Which are the three modes in which hadoop can be run?

529

Where is hadoop-env.sh file present?

529

Can we use windows for hadoop?

518

What are the hadoop configuration files at present?

523

Can we create a hadoop cluster from scratch?

474

What happens if you get a ‘connection refused java exception’ when you type hadoop fsck /?

495

In which directory hadoop is installed?

449

Un-Answered Questions { Hadoop }

State some key Points about Apache Avro?

Why do we need Hadoop?

564

What is the difference between an inputsplit and a block?

674

Explain what do you understand by cassandra- cql collections?

Give the sqoop command to see the content of the job named myjob?

Explain a scenario where you will be using spark streaming.

1465

How are joins performed in impala?

103

What is Distributed Cache?

940

What are the port numbers of namenode, job tracker and task tracker?

753

What is the default replication factor?

1024

What is Data Locality in Hadoop?

714

Define hadoop archives?

Which among the two is preferable for the project- Hadoop MapReduce or Apache Spark?

641

Explain what is the function of mapreduce partitioner?

677

What happens to job tracker when namenode is down?

718

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