Spark 广播变量(broadcast)更新方法
更新方法
spark 广播变量可以通过unpersist方法删除,然后重新广播
val map = sc.textFile("/test.txt").map(line => { val arr = line.split(",") (arr(0), arr(2).toInt) }).distinct var mapBC = sc.broadcast(map.take(10).toMap) mapBC.unpersist mapBC = sc.broadcast(map.take(2).toMap)
执行结果
map count: 192374
first broadcast: 10
second broadcast: 2