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对opstack在安装过程中经常遇见的问题进行汇总，并详细解答。

Thisisatutorialstylebeginner'sguideforOpenStackonUbuntu11.10,OneiricOcelot.TheaimistohelpthereaderinsettingupaminimalinstallationofOpenStack.

在已经搭建好的openstack平台上，实现java连接和调用openstack的工具包。

In this work, we take an experimental approach to study the characteristics of well-known sampling techniques on a full social graph of Twitter crawle