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?

266

Explain values() operation in apache spark?

498

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

391

Define sparksession in apache spark? Why is it needed?

275

Describe different transformations in dstream in apache spark streaming?

304

In hadoop_pid_dir, what does pid stands for?

524

What are the network requirements for hadoop?

474

What does hadoop-env.sh do?

448

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

478

Where is hadoop-env.sh file present?

484

Can we use windows for hadoop?

477

What are the hadoop configuration files at present?

476

Can we create a hadoop cluster from scratch?

436

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

454

In which directory hadoop is installed?

406

Un-Answered Questions { Hadoop }

Compare HBase vs RDBMS?

157

Explain the use of broadcast variables

317

What does rdd mean?

314

What are the different file permissions in the HDFS for files or directory levels?

146

what are the steps involved in decommissioning removing

1015

What is spark vs hadoop?

278

What are the relation operations in Pig? Explain any two with examples?

712

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

How is rdd fault?

284

Explain is it possible to search for files using wildcards?

478

In case of embedded Hive, can the same metastore be used by multiple users?

799

How many filters are available in HBase?

441

Define a job tracker?

704

What is meant by streaming access?

547

Describe SPM?

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