-Re: question about when do resource matching in YARN
Steve Loughran 2013-09-24, 08:54
On 21 September 2013 09:19, Sandy Ryza <[EMAIL PROTECTED]> wrote:
> I don't believe there is any reason scheduling decisions need to be coupled
> with NodeManager heartbeats. It doesn't sidestep any race conditions
> because a NodeManager could die immediately after heartbeating.
historically its been done for scale: you don't need the JT reaching out to
4K TT's just to give them work to do, instead let them connect in anyway
and get work that way. And once they start reporting in completion then
they can get given more work. It's very biased towards "worker nodes talk
to the master" over "master approaches workers"
NOTICE: This message is intended for the use of the individual or entity to
which it is addressed and may contain information that is confidential,
privileged and exempt from disclosure under applicable law. If the reader
of this message is not the intended recipient, you are hereby notified that
any printing, copying, dissemination, distribution, disclosure or
forwarding of this communication is strictly prohibited. If you have
received this communication in error, please contact the sender immediately
and delete it from your system. Thank You.