解決Zookeeper啟動失敗，出現WARN org.apache.zookeeper.ClientCnxn: Session 0x0 for server null, unexpected error, closing socket connection and attempting
將/etc/hosts文件里面的127.0.0.1 localhost那一行刪掉重啟 ...
原文：WARN Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect (org.apache.zookeeper.ClientCnxn)
: : , INFO Waiting for keeper state SyncConnected org.I Itec.zkclient.ZkClient : : , INFO Opening socket connection to server hadoop . . . : . Will not attempt to authenticate using SASL unknown erro ...
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