protobuf安装

1.下载protobufgit https://github.com/google/protobuf/releases/download/v2.6.1/protobuf-2.6.1.tar.gzgithub 编译hadoop-2.7.3 要求 protobuf-2.5.0，只须要将连接改成ubuntu https://github.com/google/protobuf/releases/down

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