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When properly deployed, Spark Streaming 1.2 provides zero data loss guarantee.

免密码ssh在搭建hadoop集群时，需要机器相互可以免密码ssh，操作如下（所有机器都要操作）：# ssh-keygen -t rsa将产生的公钥复制到第一台机器 # scp ~/.ssh/id_rsa.pub root@host:~/id_rsa.pub.1将所有密钥追加到authorized_keys中： # cat ~/.ssh/id_rsa.pub >> ~/.ssh/autho