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Containers and disk affinity
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on Jun 12, 2012
on Jun 12, 2012 by peterconrad
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Do containers assigned to a particular data node have disk affinity i.e given that container C resides on machine A does it further imply that its data resides on a particular disk?
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Jun 12, 2012 9:53 AM
Disks are striped together in *storage pools* (usually 3 disks each)--there isn't really a concept of a particular piece of data residing on one specific disk. You can use the [hadoop mfs] command to see which chunks of a file reside on which hosts. Each chunk is replicated according to the policy of the volume it is in, so in most cases you will see three hosts listed for each chunk.
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