Apache Storm配置

Question

I am facing an issue with setting isolation scheduler for a topology. Basically I am trying to set number of machines to one topology as below.

Map<String, Number> topologyToMachines = new HashMap<String, Number>();
topologyToMachines.put(TOPOLOGY_NAME, 1);
config.put(Config.STORM_SCHEDULER, "backtype.storm.scheduler.IsolationScheduler");
config.put(Config.ISOLATION_SCHEDULER_MACHINES, topologyToMachines);

If I set like above, nimbus is not dedicating a node for this topology. I have set two workers for this topology. These two workers are assigned to two nodes instead of only one node.

But If I change configuration through storm.yaml in nimbus node and submit the same topology, only one node is assigned for this topology.

Is this a bug in Storm? I am using 0.9.1 version.

Answer 1

This behaviour seems to be normal. Extract Storm 0.8.2 release notes when Isolation Settings were added.

Any topologies submitted to the cluster not listed there will not be isolated. Note that there is no way for a user of Storm to affect their isolation settings – this is only allowed by the administrator of the cluster (this is very much intentional).