Hadoop中运行start-all命令后，通过jps查看进程，发现namenode并没有启动
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按照网上的方法，删除hadoop的临时目录tmp后重启，仍然没有用
查看日志如下
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org.apache.hadoop.hdfs.server.common.InconsistentFSStateException: Directory /usr/local/hadoop/hadoop-2.8.3/tmp/dfs/name is in an inconsistent state: storage directory does not exist or is not accessible. at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverStorageDirs(FSImage.java:369) at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:220) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:1044) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:707) at org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:635) at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:696) at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:906) at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:885) at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1626) at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1694)2018-03-05 06:46:04,300 INFO org.mortbay.log: Stopped HttpServer2$SelectChannelConnectorWithSafeStartup@0.0.0.0:500702018-03-05 06:46:04,402 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Stopping NameNode metrics system...2018-03-05 06:46:04,403 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NameNode metrics system stopped.2018-03-05 06:46:04,404 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NameNode metrics system shutdown complete.2018-03-05 06:46:04,404 ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: Failed to start namenode. org.apache.hadoop.hdfs.server.common.InconsistentFSStateException: Directory /usr/local/hadoop/hadoop-2.8.3/tmp/dfs/name is in an inconsistent state: storage directory does not exist or is not accessible. at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverStorageDirs(FSImage.java:369) at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:220) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:1044) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:707) at org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:635) at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:696) at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:906) at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:885) at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1626) at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1694)2018-03-05 06:46:04,408 INFO org.apache.hadoop.util.ExitUtil: Exiting with status 1
/usr/local/hadoop/hadoop-2.8.3/tmp/dfs/name is in an inconsistent state: storage directory does not exist or is not accessible.
从这入手，这是一个临时目录，在每次hadoop重启的时候都会删除，所以找不到
解决方法：
修改core-site.xml
<property> <name>hadoop.tmp.dir</name> <value>file:///usr/local/hadoop/tmp</value></property>
改成如下：
<property> <name>hadoop.tmp.dir</name> <value>/usr/local/hadoop/tmp</value></property>
所以，每次重启临时文件都会被清除
作者：dpengwang
链接：https://www.jianshu.com/p/dbbc5cc9a323
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