We'll need "real developer" expertise on this, but my understanding of the
Client talks to Name node to get Node/Block assignments, client then talks
to node 1: write, fwd, node 2: write, fwd, node 3: write, ack node 2, node
2: ack node1, node 1: ack Client and Name Node.
write includes data write and checksum, ack = report success. The fwd
requests happen AFTER successful write and checksum.
Hope this helps.
On Tue, Dec 18, 2012 at 3:56 PM, Jay Vyas <[EMAIL PROTECTED]> wrote:
> Hi :
> Do data nodes, when they receive write requests, forward the request to
> the next datanode in the chain after appending to a file? Or rather, do the
> write and forward asynchronously and at the same time?
> Jay Vyas