Apache Hadoop Interview Questions
Questions Answers Views Company eMail

On which port does ssh work?

568

Do we need to give a password, even if the key is added in ssh?

535

What are the port numbers of namenode, job tracker and task tracker?

550

Is fs.mapr.working.dir a single directory?

520

How can we look for the namenode in the browser?

551

What do slaves consist of?

518

How can we check whether namenode is working or not?

501

What happens to job tracker when namenode is down?

528

How can I restart namenode?

546

What do masters consist of?

532

What if a namenode has no data?

524

Which are the three main hdfs-site.xml properties?

499

What is formatting of the dfs?

602

In cloudera there is already a cluster, but if I want to form a cluster on ubuntu can we do it?

536

Does this lead to security issues?

545


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Un-Answered Questions { Apache Hadoop }

What is speculative execution in Hadoop?

906


Do we need to give a password, even if the key is added in ssh?

535


Define streaming access?

514


What are the main components of a Hadoop Application?

872


What is difference between secondary namenode, checkpoint namenode & backupnod secondary namenode, a poorly named component of hadoop?

566


What is the meaning of the term "non-DFS used" in Hadoop web-console?

1089


What does /var/hadoop/pids do?

1099


What is the difference between hadoop and other data processing tools?

525


what is difference between int and intwritable?

1232


Explain InputFormat?

854


What is a task instance in hadoop? Where does it run?

475


What is Hadoop streaming?

860


What will you do when NameNode is down?

775


What does /etc /init.d do?

540


How can we change the split size if our commodity hardware has less storage space?

510