why the new java sdk take every consumer and producer as a dependant 'client'，and create some thread groups for every 'client'.

[Yelijah]

I create 10 conusmers for different topics, and my client's threads just boom up.

[leizhiyuan]

The current asyncWorker is one for each consumer/producer, perhaps in the first version it was designed for better isolation. Looking at the code, it can indeed be considered as a global thread pool.