Load balancing Sink Processor 维持了sink组中active状态的sink，使用round_robin 或 random 算法，来分散sink组中存活的sink之间的负载， 每隔一段时间随机选取某个sink
1. 组件选择
①. Load balancing Sink Processor
Load balancing sink processor provides the ability to load-balance flow over multiple sinks. It maintains an indexed list of active sinks on which the load must be distributed. Implementation supports distributing load using either via round_robin or random selection mechanisms. The choice of selection mechanism defaults to round_robin type, but can be overridden via configuration. Custom selection mechanisms are supported via cus
