Error message when try to deploy after memory adding to the node already added to the stack

[Alexander Kurenyshev]

Steps to reproduce:

1) Go to the Fuel
2) Create a new cluster.
3) Add new nodes to the cluster.
4) Softly shutdown VM with compute role.
5) Add memory to the VM, for ex. resize to 8 GB. Run VM.
6) Wait for a loading. At Fuel UI memory size label of the node has changed.
7) Try to deploy.

Observed behaviour:
There is an error message says "Node ... has insufficient disk space".

Expected behaviour:
There is a message says need to reconfigure node because its parameters were changed.

[Dima Shulyak (dshulyak)]

1. But error says about insufficien disk space, and not memory
2. If there is any bug with memory rediscovery - it should be fixed by nailgun (agent) devs

[Alexander Kurenyshev (akurenyshev)]

1. Yes. And this is not correct, I think. When node is configuring, SWAP disk size depends on memory size. I mean there should be something useful, like "Node characteristics were changed. Delete and add again Node".
2. There is no problems with memory rediscovery.

[Julia Aranovich (jkirnosova)]

Task result messages are passed on UI from nailgun, so python guys should fix it.

[Aleksey Kasatkin (alekseyk-ru)]

Seems it depends on particular cluster configuration.
I could not reproduce it on ubuntu, non-HA, neutron-vlan, 1 ctrl/cind + 1 comp.
I has changed RAM size on Compute from 1 to 4 GB.

Volume manager have some algorithms for calculation of swap size etc. depending on RAM size. That could cause this issue.
Diag. snapshot would be helpful.