See: Description
| Class | Description | 
|---|---|
| ByteArray | Serializable byte array. | 
| CachedSideInputReader | SideInputReaderthat caches materialized views. | 
| GlobalWatermarkHolder | A store to hold the global watermarks for a micro-batch. | 
| GlobalWatermarkHolder.SparkWatermarks | A  GlobalWatermarkHolder.SparkWatermarksholds the watermarks and batch time relevant to a micro-batch input
 from a specific source. | 
| GlobalWatermarkHolder.WatermarkAdvancingStreamingListener | Advance the WMs onBatchCompleted event. | 
| SideInputBroadcast<T> | Broadcast helper for side inputs. | 
| SparkSideInputReader | A  SideInputReaderfor the SparkRunner. | 
| TimerUtils |