Have a read of the replication feature design:
http://hadoop.apache.org/common/docs/r0.20.0/hdfs_design.html#Data+Replication
:)

On Thu, Mar 17, 2011 at 9:59 PM, Andrew Rothstein
<andrew.rothst...@gmail.com> wrote:
> If I'm using a replication factor of 3 and I write a block of data
> will my write operation block until the data is present on 3 nodes?

No.

> will it block until the data is present on 1 node and asynchronously
> replicate from there to 2 other nodes?

Yes!

-- 
Harsh J
http://harshj.com

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