Explain to me the difference between Name Node and Secondary Name Node

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I am a newbie to Big Data thing. I have a doubt related to the Hadoop Architecture. Is it like the Secondary Name Node stand up as a backup to the Name Node?

If Yes,

Then, Why does Hadoop go to "Hadoop not available" state when the Name Node fails?

Please help me learn this.
Jun 21 in Big Data Hadoop by nitinrawat895
• 10,110 points
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1 answer to this question.

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First of all, 

Let us begin with the architecture.

Now the above image represents the architecture of Hadoop.

Let me explain u in detail.

Here you have the following

  • Name Node 
  • Data Node
  • Secondary Name Node

Secondary Name Node acts as a buffer to the Name Node, Not as its Back up. It stores the intermediate updates of the FS in a file called edit-log and updates them to the Final FS Image when Name Node is inactive. 

We are currently updated to Hadoop Version 2.x and it is no more related to the Secondary Name Node. It is replaced by the Standby Name node Which acts as a stand by to the actual name node and handles the Name Node Failures.

answered Jun 21 by ravikiran
• 3,560 points

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