本文介绍了解决Hadoop中SecondaryNameNode出现异常的方法。首先需要停止Hadoop服务，接着删除临时目录中的SecondaryNameNode数据文件（路径可通过hadoop.tmp.dir获取），最后重新启动Hadoop服务即可解决问题。
http://stackoverflow.com/questions/21732988/error-org-apache-hadoop-hdfs-server-namenode-secondarynamenode-exception-in-doc
We need to stop the hadoop services first , and then delete the tmp secondary namenode directory (hadoop.tmp.dir will
tell the path for secondary namenode data directory). After this, start the services again and the issue will be fixed.
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