dear Haosdent,
my bad; actually i use http://10.132.46.81:5050/reserve for reservation, and http://10.132.46.81:5050/unreserve
for releasing resources  :)

if i do not add this, mesos will report error:

```
HTTP/1.1 400 Bad Request
Date: Sun, 01 May 2016 01:11:50 GMT
Content-Length: 75

Invalid RESERVE operation: Resource cpus(dev):1 is not dynamically reserved
```
i’m using `dev` role in marathon.

Best Regards.

GaoJin CAO
ChinaMobile(Suzhou) R&D
Phone:18896723732
Mail:caogaojin at cmss.chinamobile.com <http://cmss.chinamobile.com/>