Structured Streaming编程 Programming Guide Overview Quick Example Programming Model Basic Concepts Handling Event-time and Late Data Fault Tolerance Semantics API using Datasets and DataFrames Creating streaming DataFrames and streaming Datasets Input
BC Business view columns. Columns that are included in the attached business view. These columns are populated with values from the database when a fetch is performed, and those values are the values that are saved to the database during an add or up
3.1 SparkContext概述 SparkConf负责配置参数,主要通过ConcurrentHaspMap来维护各种Spark的配置属性. class SparkConf(loadDefaults: Boolean) extends Cloneable with Logging with Serializable { import SparkConf._ /** Create a SparkConf that loads defaults from system properties an