6-Flink重启策略

1.策略固定间隔 (Fixed delay)

2.失败率 (Failure rate)

3.无重启 (No restart)

	restart-strategy: fixed-delay 
	restart-strategy.fixed-delay.attempts: 3 
	restart-strategy.fixed-delay.delay: 10 s

```

env.setRestartStrategy(RestartStrategies.fixedDelayRestart( 3,// 尝试重启的次数 

    Time.of(10, TimeUnit.SECONDS) // 间隔 ));

```

    restart-strategy: failure-rate  
	restart-strategy.failure-rate.max-failures-per-interval: 3  
	restart-strategy.failure-rate.failure-rate-interval: 5 min  
	restart-strategy.failure-rate.delay: 10 s

   env.setRestartStrategy(RestartStrategies.failureRateRestart(  3,//一个时间段内的最大失败次数  
Time.of(5, TimeUnit.MINUTES), // 衡量失败次数的是时间段  Time.of(10, TimeUnit.SECONDS) // 间隔  ));

	restart-strategy: none

ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment(); 	env.setRestartStrategy(RestartStrategies.noRestart());

public class RestartTest {

    public static void main(String[] args) {
        //获取flink的运行环境
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        // 每隔1000 ms进行启动一个检查点【设置checkpoint的周期】
        env.enableCheckpointing(1000);

        // 间隔10秒 重启3次
        env.setRestartStrategy(RestartStrategies.fixedDelayRestart(3,Time.seconds(10)));

        //5分钟内若失败了3次则认为该job失败，重试间隔为10s
        env.setRestartStrategy(RestartStrategies.failureRateRestart(3,Time.of(5,TimeUnit.MINUTES),Time.of(10,TimeUnit.SECONDS)));

        //不重试
        env.setRestartStrategy(RestartStrategies.noRestart());
    }//

}