PHP program can be run under server XAMPP. It is a free open source cross-platfrom web server package. XAMPP stands for ( X
Month: January 2016
Resolve XAMPP, Apache – Error: Apache shutdown unexpectedly
If you are facing below error while starting Apache in XAMPP 09:11:23 [Apache] Status change detected: running 09:11:23 [Apache] Status change
What is HADOOP?
Hadoop is an open-source software framework. Hadoop was created by Doug Cutting and Mike Cafarella in 2005. Cutting, who was
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