Hadoop is an open-source software framework. Hadoop was created by Doug Cutting and Mike Cafarella in 2005. Cutting, who was
Category: Interview Question
What is DataNode in hadoop?
A DataNode in hadoop stores data in the [Hadoop File System]. A functional file system has more than one DataNode,
What is NameNode in hadoop?
The NameNode in hadoop is the centerpiece of an HDFS file system. It keeps the directory tree of all files
What is JobTracker and TaskTracker in hadoop?
The main work of JobTracker and TaskTracker in hadoop is given below. JobTracker is a master which creates and runs
What is InputSplit in hadoop?
InputSplit represents the data to be processed by an individual Mapper. it presents a byte-oriented view on the input and is
What is RecordReader in hadoop?
RecordReader reads <key, value> pairs from an InputSplit. Where key and value is- key – the key to read data
What are the most common input formats in Hadoop? Which input format is default one?
These are the most common input formats in Hadoop. Text Input Format Key Value Input Format Sequence File Input Format
What are the input formats in hadoop?
These are input formats in hadoop. CombineFileInputFormat, CombineSequenceFileInputFormat, CombineTextInputFormat, CompositeInputFormat, DBInputFormat, FileInputFormat, FixedLengthInputFormat, KeyValueTextInputFormat, MultiFileInputFormat, NLineInputFormat, Parser.Node, SequenceFileAsBinaryInputFormat, SequenceFileAsTextInputFormat, SequenceFileInputFilter,
What is TextInputFormat and KeyValueInputFormat class?
In Hadoop TextInputFormat reads lines of text files and provides the offset of the line as key to the Mapper and
What is a Combiner in hadoop?
The Combiner in hadoop is a ‘mini-reduce’ process which operates only on data generated by a mapper. The Combiner will
What is acceptable cell and suitable cell in LTE?
The difference between acceptable cell and suitable cell in LTE is given below. acceptable cell In a area where UE
What are the states of a process?
States of a process In multitasking computer system each process goes through a number of states from entry into the
What is mutex?
Mutex Mutex is stand for mutual exclusion object. In computer programming, a mutex is a program object that allows multiple program threads (light weight process) to
What is process migration?
Process migration In simple word Process migration means move a process between machines during its lifetime. It is the act