Hi Sahara,
Recently, I learned Sahara support nodes scale up & scale down, which means
"scale" has been limited to node number.
Is it possible to do a "instance scale"?
For example, I build a small cluster at first, several slave nodes (running
datanode & nodemanager) and a single master node (running all other processes)
I keep increasing the number of slave nodes, and in a moment, my master node
has become the performance bottleneck of the whole cluster.
In this case, I would like to do several things, such as:
1. resize the master node. Using command like "nova resize", to add more
cpu & memory and other resources for this single instance.
2. Split processes on the master node to several nodes.
I think it make sense to users.
Or the whole "performance bottleneck" staff would never happen in real world
???
Another example, I already have a big cluster, and now I want to enable a new
service on it.
1. I would like to start a new node for the new service and add the new
node into my cluster.
2. Or, just start the new service on a node which already in the cluster.
Currently, Sahara start cluster and manage all nodes based on "templates", so
everything on "living" has to be pre-defined.
Things on above breaks the whole "pre-defined" thing.
So, my question here is:
Is it possible for Sahara to do things like that ?
Would Sahara want to support things like this ?
If yes, any plans in the past, in the future?
If not, any special reasons ??
Looking forward to your reply.
Thanks.
-chen
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