springboot每隔一段时间后第一次请求耗时特别长（内含详情）

    @RequestMapping(value = "/status")

    @ResponseBody

    public

    Map status(HttpServletRequest request){

        Map m = new HashMap<>;



        m.put("name", "*****");

        m.put("remote_addr", request.getHeader("X-Real-Addr"));



        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

        Calendar calendar = Calendar.getInstance();

        m.put("time", sdf.format(calendar.getTime()));





        return m;

    }

#logging(TRACE DEBUG INFO WARN)

logging.level.org.apache=debug

logging.level.org.springframework=INFO

logging.level.org.springframework.jdbc.core.StatementCreatorUtils=TRACE

logging.level.org.springframework.jdbc.core=DEBUG

2017-08-22 16:28:54,430 [http-nio-8000-Acceptor-0] DEBUG o.a.tomcat.util.threads.LimitLatch - Counting up[http-nio-8000-Acceptor-0] latch=1

2017-08-22 16:28:54,430 [http-nio-8000-exec-2] DEBUG o.a.coyote.http11.Http11NioProtocol - Processing socket [org.apache.tomcat.util.net.NioChannel@16655a47:java.nio.channels.SocketChannel[connected local=/192.168.0.30:8000 remote=/192.168.0.30:55507]] with status [OPEN_READ]

2017-08-22 16:28:54,431 [http-nio-8000-exec-2] DEBUG o.a.coyote.http11.Http11InputBuffer - Received [GET /rest/db/status HTTP/1.0

X-Real-Addr: 192.168.1.106

X-Real-Port: 54620

HostAddr: http://192.168.1.30

HostPort: 9999

project: /rest

ServerAddr: http://192.168.1.30:9999

Host: 192.168.0.30:8000

Connection: close

Pragma: no-cache

Cache-Control: no-cache

Upgrade-Insecure-Requests: 1

User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.101 Safari/537.36

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8

Accept-Encoding: gzip, deflate

Accept-Language: zh-CN,zh;q=0.8



]

2017-08-22 16:28:55,843 [http-nio-8000-exec-2] DEBUG o.a.c.a.AuthenticatorBase - Security checking request GET /rest/db/status

2017-08-22 16:28:55,843 [http-nio-8000-exec-2] DEBUG org.apache.catalina.realm.RealmBase -   No applicable constraints defined

2017-08-22 16:28:55,843 [http-nio-8000-exec-2] DEBUG o.a.c.a.AuthenticatorBase -  Not subject to any constraint

2017-08-22 16:28:55,843 [http-nio-8000-exec-2] DEBUG o.apache.tomcat.util.http.Parameters - Set encoding to UTF-8

2017-08-22 16:28:55,844 [http-nio-8000-exec-2] INFO  org.kys.log.spring.LogInterceptor - start [/rest/db/status]

2017-08-22 16:28:55,847 [http-nio-8000-exec-2] INFO  org.kys.log.spring.LogInterceptor - complete [/rest/db/status] :: Time Taken=3

2017-08-22 16:28:55,847 [http-nio-8000-exec-2] DEBUG o.a.coyote.http11.Http11Processor - Socket: [org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper@75160339:org.apache.tomcat.util.net.NioChannel@16655a47:java.nio.channels.SocketChannel[connected local=/192.168.0.30:8000 remote=/192.168.0.30:55507]], Status in: [OPEN_READ], State out: [CLOSED]

2017-08-22 16:28:55,848 [http-nio-8000-exec-2] DEBUG o.a.tomcat.util.threads.LimitLatch - Counting down[http-nio-8000-exec-2] latch=1

2017-08-22 16:29:03,493 [http-nio-8000-Acceptor-0] DEBUG o.a.tomcat.util.threads.LimitLatch - Counting up[http-nio-8000-Acceptor-0] latch=1

2017-08-22 16:29:03,503 [http-nio-8000-exec-3] DEBUG o.a.coyote.http11.Http11NioProtocol - Processing socket [org.apache.tomcat.util.net.NioChannel@16655a47:java.nio.channels.SocketChannel[connected local=/192.168.0.30:8000 remote=/192.168.0.30:55520]] with status [OPEN_READ]

2017-08-22 16:29:03,504 [http-nio-8000-exec-3] DEBUG o.a.coyote.http11.Http11InputBuffer - Received [GET /rest/db/status HTTP/1.0

X-Real-Addr: 192.168.1.106

X-Real-Port: 54620

HostAddr: http://192.168.1.30

HostPort: 9999

project: /rest

ServerAddr: http://192.168.1.30:9999

Host: 192.168.0.30:8000

Connection: close

Pragma: no-cache

Cache-Control: no-cache

Upgrade-Insecure-Requests: 1

User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.101 Safari/537.36

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8

Accept-Encoding: gzip, deflate

Accept-Language: zh-CN,zh;q=0.8



]

2017-08-22 16:29:03,507 [http-nio-8000-exec-3] DEBUG o.a.c.a.AuthenticatorBase - Security checking request GET /rest/db/status

2017-08-22 16:29:03,508 [http-nio-8000-exec-3] DEBUG org.apache.catalina.realm.RealmBase -   No applicable constraints defined

2017-08-22 16:29:03,508 [http-nio-8000-exec-3] DEBUG o.a.c.a.AuthenticatorBase -  Not subject to any constraint

2017-08-22 16:29:03,508 [http-nio-8000-exec-3] DEBUG o.apache.tomcat.util.http.Parameters - Set encoding to UTF-8