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 add the partition in existing table without the partition table?

754

How do you list all databases whose name starts with p?

744

Is there a date data type in Hive?

783

What do you mean by schema on reading?

765

Can a table be renamed in Hive?

779

What is throughput? How does HDFS provide good throughput?

File permissions in HDFS?

What is Hadoop HDFS – Hadoop Distributed File System?

How to change the replication factor of data which is already stored in HDFS?

What is Block in HDFS?

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

Can multiple clients write into an HDFS file concurrently?

Why is block size set to 128 MB in Hadoop HDFS?

168

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

How HDFS client divide the file into the block while storing inside HDFS?

Un-Answered Questions { Hadoop }

Where is kafka used?

572

Different running modes for running Pig?

927

What is difference between dataset and dataframe?

408

How can you stop a partition form being queried?

810

When should you use a reducer?

683

Explain why to use hbase?

166

Define a metadata?

703

What is sparkContext?

303

How do you parse data in xml? Which kind of class do you use with java to pass data?

321

Does 'ILLUSTRATE' run a MapReduce job?

568

How does inputsplit in mapreduce determines the record boundaries correctly?

690

Use of list-databases command in hadoop sqoop?

What are the most common InputFormats in Hadoop?

646

What is the use of “resultset execute” method?

How do I download spark?

288

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