/tmp/hadoop-hadoop-datanode.pid: Permission denied
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今天终于要把分布式的集群搭建完毕啦，就在我与成功差之毫厘的时候，执行sbin/stop-all.sh 命令并不能把datanode关闭掉，无奈只能强制Kill掉 ，错误显示/tmp/hadoop-hadoop-datanode.pid: Permission denied 在网上搜索了好多办法有的说给tmp目录777权限，我没有成功，终于找到一个办法就是修改hadoop-env.sh文件，添加export HADOOP_PID_DIR=/usr/local/hadoop/tmp/pid 同时记得在slave节点里也修改这一项，我开始的就是没有改slave节点里的HADOOP_PID_DIR 导致 检查了好久都不对。
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