Hadoop 异常 总结

   
Directory /tmp/hadoop-lee/dfs/name is in an inconsistent state: storage directory DOES NOT exist or is NOT accesible
原因：
http://lucene.472066.n3.nabble.com/Directory-tmp-hadoop-root-dfs-name-is-in-an-inconsistent-state-storage-directory-DOES-NOT-exist-or-ie-td812243.html

引用

Normally this is due to the machine having been rebooted and /tmp being cleared out. You do not want to leave the Hadoop name node or data node storage in /tmp for this reason. Make sure you properly configure dfs.name.dir and dfs.data.dir to point to directories outside of /tmp and other directories that may be cleared on boot.

再参看下面的文档：
http://hadoop.apache.org/docs/r1.1.1/hdfs-default.html可以知道
dfs.name.dir 的默认值为 ${hadoop.tmp.dir}/dfs/name
dfs.data.dir 的默认值为 ${hadoop.tmp.dir}/dfs/data
所以，在 $HADOOP/conf/core-site.xml 中更改 hadoop.tmp.dir 即可（hadoop.tmp.dir 默认为 /tmp/hadoop-${user.name}），如下面的例子：

指定哪个目录合适那？待议。。。

完事之后记得 format 原 namenode 使异常不再出现（数据亦被格式化掉）：

$ hadoop namenode -format

java.io.IOException: File /tmp/hadoop-lee/mapred/system/jobtracker.info could only be replicated to 0 nodes, instead of 1

$ hadoop dfsadmin -safemode leave