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

Who divides the file into Block while storing inside hdfs in hadoop?

What are file permissions in HDFS? how does HDFS check permissions for files/directory?

How one can change Replication factor when Data is already stored in HDFS

Explain HDFS “Write once Read many” pattern?

Why is block size set to 128 MB in HDFS?

What should be the HDFS Block size to get maximum performance from Hadoop cluster?

What is the importance of dfs.namenode.name.dir in HDFS?

How one can format Hadoop HDFS?

Explain what happens if, during the PUT operation, HDFS block is assigned a replication factor 1 instead of the default value 3?

How to format the HDFS? How frequently it will be done?

Which one is the master node in HDFS? Can it be commodity hardware?

What happens if the block on Hadoop HDFS is corrupted?

What is a block in HDFS, why block size 64MB?

How NameNode tackle Datanode failures in HDFS?

How is indexing done in Hadoop HDFS?

Un-Answered Questions { Hadoop }

Define the term ‘Lazy Evolution’ with reference to Apache Spark

306

What is Hive Data Definition language?

981

What do you understand by data center in cassandra?

What is a parquet file?

286

How to set the number of reducers?

1369

What is oozie in hadoop?

678

Is spark streaming real time?

285

Is map like a pointer?

924

What are znodes?

What is Mapper in Hadoop MapReduce?

746

Which are the methods to create rdd in spark?

295

What are the optimization techniques in spark?

284

What is heartbeat in hadoop?

432

Clarify how ordering in hdfs is finished?

500

Name the components of spark ecosystem.

278

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