What is a Record Reader in hadoop?

957

Where is the Mapper Output stored?

1374

How to resolve small file problem in hdfs?

980

What is a Secondary Namenode? Is it a substitute to the Namenode?

1032

How blocks are distributed among all data nodes for a particular chunk of data?

1090

How many instances of tasktracker run on a hadoop cluster?

679

Have you ever used Counters in Hadoop. Give us an example scenario?

1063

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

722

Explain the benefits of block transfer?

823

Explain how input and output data format of the hadoop framework?

714

what is difference between int and intwritable?

1475

Can hive run without hadoop?

672

What is the use of combiners in the hadoop framework?

618

What is Input Split in hadoop?

981

What is the difference between Gen1 and Gen2 Hadoop with regards to the Namenode?

1172