bloomberg
Feat[MQB]: Thread safe Cluster Quorum Manager and ITs
Describe your changes Initial intention was to add a new switch to ITs which restarts cluster (having multiple nodes) in FSM mode running only single node, then set quorum to 1 to get cluster into heathy state having only one node up.
After code inspection it was found out that there are 4 quorums in the code which are not in sync. Thus this PR proposes a new class Cluster Quorum Manager which stores and provides thread safe Quorum variable for other components.
There is a small change in behavior how quorum from config file is treated. Previously even if in config a big value is set for quorum, it is reset to number of nodes. However quorum can be set to any value via admin commands. I refactored the behavior to be universal in both cases -- there is no more restriction on max quorum values.
Testing performed
- UTs passed
- ITs passed
