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MapReduce >> mail # user >> What is Block Pool ID namenode?

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What is Block Pool ID namenode?
Hi Guys,

In my node namenode page I seen

Started:Wed Feb 27 12:41:28 EST 2013 Version:2.0.0-cdh4.0.1,
4d98eb718ec0cce78a00f292928c5ab6e1b84695 Compiled:Mon Sep 24 13:30:27 EDT
2012 by dracdemo from Unknown Upgrades:There are no upgrades in
progress. Cluster
ID:cluster26 *Block Pool ID:**BP-1936777173-*

what is actually mean Block pool id please guide me.

<BP-some number><IP Address><somenumber>

How to understand the sequence.


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