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 is Sqoop Import? Explain its purpose?

What are the main features of impala?

Who is a 'user' in HDFS?

890

What is difference between flume and kafka?

What are all stats classes in the org.apache.pig.tools.pigstats package?

567

Is it possible to run Spark and Mesos along with Hadoop?

275

Explain what is a task tracker in hadoop?

452

What are the data components used by Hadoop?

738

What will happen in case you have not issued the command: ‘set hive.enforce.bucketing=true;’ before bucketing a table in hive in apache hive 0.x or 1.x?

773

How is HDFS fault tolerant?

1037

Mention what is rack awareness?

381

What are the use cases of Apache Pig?

798

What is a rack awareness algorithm and why is it used in hadoop?

How data or file is written into HDFS?

What are spark jobs?

300

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