#20 java outofmemory exception when creating Glance image.
this issue is jersey lib problem. reference below url
I changed http client to ApacheConnector in ClientFactory.java and add
dependency of jersey-apache-connector in pom 
 
https://java.net/jira/browse/JERSEY-2024
http://jersey.576304.n2.nabble.com/Jersey2-Client-OutOfMemoryError-when-uploading-large-file-td7581068.html