Apache Hadoop Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Apache Hadoop Interview Questions

Questions Answers Views Company eMail

How Mapper is instantiated in a running job?

945

Where do you specify the Mapper Implementation?

942

What is the meaning of speculative execution in Hadoop? Why is it important?

1015

What is the InputFormat ?

959

Command to format the NameNode?

886

Who is a 'user' in HDFS?

846

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

1236

did you maintain the hadoop cluster in-house or used hadoop in the cloud?

967

What is DistributedCache and its purpose?

860

What is HDFS ? How it is different from traditional file systems?

883

What is HDFS Block size? How is it different from traditional file system block size?

1 1376

How you can contact your client everyday ?

924

What is Input Split in hadoop?

919

What is 'Key value pair' in HDFS?

903

How to keep HDFS cluster balanced?

1051

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Un-Answered Questions { Apache Hadoop }

What are channel selectors?

951

What is the difference between HDFS and NAS ?

1316

Who is a 'user' in HDFS?

846

What are the benefits of block transfer?

954

What is keyvaluetextinputformat?

690

What is IdentityMapper?

935

how would you modify that solution to only count the number of unique words in all the documents?

928

what factors the block size takes before creation?

961

Is client the end user in HDFS?

942

What hadoop does in safe mode?

610

Why are the number of splits equal to the number of maps?

908

If a data Node is full how it's identified?

881

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

665

What does the command mapred.job.tracker do?

719

Is it necessary to write jobs for hadoop in the java language?

620

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