Hadoop Interview Questions And Answers For Freshers

Question: What is Hadoop?
It is opensource software based on java.




Question: Why we use Hadoop?
It support for application on large clusters. It scale from single server to 1000 server.




Question: What type of data it Support?
It support data-intensive distributed application.



Question: Is it framework?
Yes, Hadoop is framework.




Question: How it work?
Applications are divided in small pieces (fragment) of work, which is execute separately in cluster.





Question: What is hadoop used for?
It is used for data-mining from large set of data. It gives you result oriented data from unstructed data.





Question: Where did Hadoop come from?
Hadoop was invented by google so that they can stored and index their imporation information. In the development of Hadoop Yahoo play very vital role.





Question: What is HDFS?
Hadoop Distributed File System (HDFS) is a sub-project of the Apache Hadoop.

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Soap Interview Questions and Answers for Experienced

What is SOAP ?
It is communication protocol based on XML.


What is Full Form of SOAP?
Simple Object Access Protocol.


Why we use it?
It is used to communicate between two applications that is on different operating system and on different language.
SOAP is platform independent.
SOAP is Language Independent.
SOAP is simple and Extensive.


How to use SOAP?
SOAP is communication protocol, that use xml to communicate.
To use SOAP write your xml in some specific format and xml must contain some specific elements.


What are the elements use is SOAP message.?
It has 4 imp elements that are following..

•  Envelope element: It contain information about this document and message.
•  Header element: It contain information about  header.
•  Body element: It contain Message
•  Fault element: containing errors and status information

What are syntax for SOAP?

Following are the syntax for SOAP..

•  Encoded using XML
•  Use the SOAP Envelope namespace
•  SOAP Encoding namespace
• A SOAP message must NOT contain a DTD reference
• A SOAP message must NOT contain XML Processing instructions

What is structure for SOAP?

    <soap:envelope soap:encodingstyle="http://www.w3.org/2001/12/soap-encoding" xmlns:soap="http://www.w3.org/2001/12/soap-envelope">
      <soap:header></soap:header>
      <soap:body>
        <soap:fault></soap:fault>
      </soap:body>
  </soap:envelope>

What is SOAP Envelope Element?
It is root element of a soap and it define about xml document. It have following attributes
encodingStyle : It may appear on any soap element.

<soap-env:envelope soap-env:encodingstyle="http://www.www.org/soap/encoding/" xmlns:soap-env="http://www.www.org/soap/envelope/">
<!-- SOAP body goes here -->
</soap-env:envelope>

What is SOAP Header Element?
SOAP Header: It contain application information (for example payment, authentication).It is optional. It have following attributes:
encodingStyle : It may appear on any soap element.

<soap:encodingStyle="http://php-tutorial-php.blogspot.in/2012/11/soap.html">

mustUnderstand: The SOAP mustUnderstand attribute can be used to indicate whether a header entry is mandatory or optional for the recipient to process. If you add mustUnderstand='1' to a child element of the Header element it indicates that the receiver processing the Header must recognize the element. If the receiver does not recognize the element it will fail when processing the Header.

<soap:mustUnderstand="0|1">

actor: It is used to address the header element to a specific endpoint.

<soap:actor="http://php-tutorial-php.blogspot.in/2012/11/soap.html"> 

What is SOAP Body Element?
SOAP Body: It contain the actual SOAP message intended for the ultimate endpoint of the message

<soap:body>
  <m:getblogresponse http:="http:" php-tutorial-php.blogspot.in="php-tutorial-php.blogspot.in" soap.html="soap.html" xmlns:m="">
    <m:blogname>php-tutorial-php.blogspot.com</m:blogname>
  </m:getblogresponse>
</soap:body>

What is SOAP Fault Element?
If a Fault element is present, it must appear as a child element of the Body element. A Fault element can only appear once in a SOAP message.  

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