flink状态设置过期时间

   //设置2分钟过期
    val ttlConfig = StateTtlConfig
      .newBuilder(Time.minutes(2))
      .setUpdateType(StateTtlConfig.UpdateType.OnCreateAndWrite)
      .setStateVisibility(StateTtlConfig.StateVisibility.NeverReturnExpired)
      .build

    val stateDesc = new MapStateDescriptor[String, String]("keyFilter", TypeInformation.of(new TypeHint[String] {}),
      TypeInformation.of(new TypeHint[String] {}))