Spring Cloud Series: Start slow initializing executorservice ' TaskScheduler '

At the start of a single service, a problem was found, which started super slow when the console was output to the following information, and it took about three minutes to wait.

INFO  | restartedmain | org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler | Initializing Executorservice  ' TaskScheduler '

Guess the following reasons, this is a threadpolltaskscheduler, it should be a thread pool initialization task, the entire project used only two places, Spring bus and Zipkin, when the Zipkin of the dependencies of the comment off, found that the start of all normal.

    Service tracking function
    //compile ("Org.springframework.cloud:spring-cloud-sleuth-zipkin-stream")

I use the stream communication method, HTTP communication should be no problem, the problem is not completely solved, then will delve into.