Flink 1.12.2 源码分析 : 官方 Flink Plan Visualizer 使用.

一. 前言

官方提供了获取执行计划的WEB页面. 入口 : https://flink.apache.org/visualizer/

二. 使用

2.1. 获取执行计划json字符串.

获取执行计划的json字符串很简单. 就是在代码里面加一个输出就行了.

System.out.println(env.getExecutionPlan());

在这里插入图片描述

• 获取的json字符串如下 :

{
  "nodes" : [ {
    "id" : 1,
    "type" : "Source: Socket Stream",
    "pact" : "Data Source",
    "contents" : "Source: Socket Stream",
    "parallelism" : 1
  }, {
    "id" : 2,
    "type" : "Flat Map",
    "pact" : "Operator",
    "contents" : "Flat Map",
    "parallelism" : 4,
    "predecessors" : [ {
      "id" : 1,
      "ship_strategy" : "REBALANCE",
      "side" : "second"
    } ]
  }, {
    "id" : 4,
    "type" : "Window(TumblingProcessingTimeWindows(5000), ProcessingTimeTrigger, ReduceFunction$1, PassthroughWindowFunction)",
    "pact" : "Operator",
    "contents" : "Window(TumblingProcessingTimeWindows(5000), ProcessingTimeTrigger, ReduceFunction$1, PassthroughWindowFunction)",
    "parallelism" : 4,
    "predecessors" : [ {
      "id" : 2,
      "ship_strategy" : "HASH",
      "side" : "second"
    } ]
  }, {
    "id" : 5,
    "type" : "Sink: Print to Std. Out",
    "pact" : "Data Sink",
    "contents" : "Sink: Print to Std. Out",
    "parallelism" : 1,
    "predecessors" : [ {
      "id" : 4,
      "ship_strategy" : "REBALANCE",
      "side" : "second"
    } ]
  } ]
}

2.2. 解析执行计划

• 打开官方提供的解析执行计划的地址 : https://flink.apache.org/visualizer/

• 这样就获取到了StreamGraph . 右上角的按钮对应的 放大,缩小,重置 . 根据需要进行操作…