[openstack-dev] [Savanna-all] Cluster scaling discussion

Matthew Farrellee matt at redhat.com
Fri Jul 12 18:28:40 UTC 2013

A comment on how you go about this. I believe you've already run into 
issues w/ using the start/stop-*.sh scripts as a foundation for this 

Long term I believe that an active cluster need not mean every instance 
is up and running. The core infrastructure must be (ambari + jt + nn), 
and some % of worker instances (jt + dn). For example, if I want to make 
a 500 instance cluster, I won't need to wait for all 500 instances 
before I can reasonably start using the cluster. In fact, I may never 
have 500 instances at any given time, 98% may be acceptable operating 
procedure. The start/stop-*.sh scripts are not good for that use case 

However you go about this, keep the 98% cluster use case in mind.



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