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

What is impala?

130

Why we need impala hadoop?

What is the maximum number of rows in a table?

Describe impala shell (impala-shell command)?

Can any impala query also be executed in hive?

State some advantages of impala?

Does impala use caching?

How are joins performed in impala?

103

What are distinct operators in impala?

What is troubleshooting for impala?

Can impala be used for complex event processing?

169

How do I configure hadoop high availability (ha) for impala?

How do I know how many impala nodes are in my cluster?

160

What are the differences between relational databases and impala?

On which hosts does impala run?

Un-Answered Questions { Hadoop }

What happen when namenode enters in safemode in hadoop?

395

Is it possible to use same metastore by multiple users, in case of embedded hive?

624

What is zookeeper in hadoop?

611

What is LazyOutputFormat in MapReduce?

639

What are the different tools used for Ambari monitoring purpose?

What are file permissions in HDFS and how HDFS check permissions for files or directory?

What is spark ml?

330

Define cell in HBase?

162

In how many ways RDDs can be created? Explain.

287

What is the difference between DAG and Lineage?

1606

How to Administering Hadoop?

870

Wherever (Different Directory) I run the hive query, it creates new metastore_db, please explain the reason for it?

721

What is flume and kafka?

Can a table be renamed in Hive?

680

What is active and passive NameNode in HDFS?

226

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