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From Todd Snyder <tsny...@blackberry.com>
Subject Re: Adding datanodes to Hadoop cluster - Will data redistribute?
Date Fri, 06 Feb 2015 23:11:36 GMT
Look at the hadoop balancer - it will live data around and balance it across the nodes.

Sent from the wilds on my BlackBerry smartphone.
From: Manoj Venkatesh
Sent: Friday, February 6, 2015 5:54 PM
To: user@hadoop.apache.org
Reply To: user@hadoop.apache.org
Subject: Adding datanodes to Hadoop cluster - Will data redistribute?

Dear Hadoop experts,

I have a Hadoop cluster of 8 nodes, 6 were added during cluster creation and 2 additional
nodes were added later to increase disk and CPU capacity. What i see is that processing is
shared amongst all the nodes whereas the storage is reaching capacity on the original 6 nodes
whereas the newly added machines have relatively large amount of storage still unoccupied.

I was wondering if there is an automated or any way of redistributing data so that all the
nodes are equally utilized. I have checked for the configuration parameter - dfs.datanode.fsdataset.volume.choosing.policy
have options 'Round Robin' or 'Available Space', are there any other configurations which
need to be reviewed.


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