hdfs启动报错“ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: Failed to start namenode.”

启动hdfs失败：

查看日志文件：

/var/log/hadoop-hdfs
tail -f hadoop-cmf-hdfs-NAMENODE-XXXX.log.out

错误内容如下：

2018-06-15 17:20:50,996 INFO org.mortbay.log: Stopped HttpServer2$SelectChannelConnectorWithSafeStartup@bj-esbp-master.w-oasis.com:50070
2018-06-15 17:20:51,096 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Stopping NameNode metrics system...
2018-06-15 17:20:51,096 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NameNode metrics system stopped.
2018-06-15 17:20:51,097 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NameNode metrics system shutdown complete.
2018-06-15 17:20:51,097 ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: Failed to start namenode.
org.apache.hadoop.hdfs.server.common.InconsistentFSStateException: Directory /data/dfs/nn 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:325)
	at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:213)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:1081)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:778)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:614)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:676)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.(NameNode.java:844)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.(NameNode.java:823)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1548)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1616)
2018-06-15 17:20:51,098 INFO org.apache.hadoop.util.ExitUtil: Exiting with status 1
2018-06-15 17:20:51,099 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: SHUTDOWN_MSG: