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

Are there any special requirements for namenode?

431

is there a standard procedure to deploy hadoop?

431

What happen if a datanode loses network connection for a few minutes?

610

What is the procedure for namenode recovery?

463

How would an hadoop administrator deploy various components of hadoop in production?

423

What happen if one of the datanodes has much slower cpu?

437

After increasing the replication level, I still see that data is under replicated. What could be wrong?

465

Web-ui shows that half of the datanodes are in decommissioning mode. What does that mean? Is it safe to remove those nodes from the network?

452

What is the difference between a hadoop database and relational database?

457

Can we deploye job tracker other than name node?

664

What is difference between secondary namenode, checkpoint namenode & backupnode?

473

Name the most common input formats defined in hadoop?

451

Which one is default?

492

Is it possible to have hadoop job output in multiple directories?

446

What is tasktracker in hadoop?

437

Un-Answered Questions { Hadoop }

What is a bloom filter?

162

Discuss how you can use filters in apache hbase

162

Can the region server will be located on all datanodes?

316

What is Geo-Replication in Kafka?

882

Mention some basic tajo shell commands?

In how many ways RDDs can be created? Explain.

302

Different ways of debugging a job in MapReduce?

1113

What is the difference between Hive CLI and Beeline?

851

hbase support syntax structure like sql. Yes or no?

200

Can we run Apache Spark without Hadoop?

306

What is executor in spark?

310

Mention what is the use of Context Object?

727

What is Cassandra Database Software ?

166

Explain the use of .mecia class?

792

When running Spark applications, is it necessary to install Spark on all the nodes of YARN cluster?

332

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