Hi, As per this guide: http://storm.apache.org/releases/current/Understanding-the-parallelism-of-a-Storm-topology.html ,
An executor is a thread containing many tasks. And each task is an instance of a spout or a bolt. I cannot imagine when would someone want to have multiple tasks in an executor. AFAIK, Only use-case possible is when the tasks in an executor have to be synchronous i.e. first task must wait for the second task (in the same executor) to complete and that must wait for the third task (in the same executor) to complete and so on. But that requires the tasks in an executor to be different from each other. Where as the current API does not permit tasks of different type within an executor. So I am "guessing" that multiple tasks in an executor is just a historical artifact with no real use-case. And that is also a reason why Flux has no option to specify num-tasks. $ grep -ri task storm/flux/flux-core/src ===> nothing ! Please confirm if that is a correct understanding. Also, if that is correct, we might be able to squeeze some performance by allowing only a single task per executor. Thanks SG
