you can find the code directly in FSNameSystem#allocateBlock
It is just a random long number and will ensure that blockid is not created 
already by NN.
Regards,
Uma
________________________________________
From: kartheek muthyala [kartheek0...@gmail.com]
Sent: Tuesday, November 29, 2011 6:07 PM
To: hdfs-...@hadoop.apache.org; hdfs-user
Subject: blockID generation

Hi all,
I am interested in exploring how the blockID is generated in hadoop world
by the namenode. Any pointers to the class/method which takes care of this
generation?
Thanks in advance,
~Kartheek.

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