Hadoop0.20.203.0在关机重启后，namenode启动报错（/dfs/name is in an inconsistent state）

Hadoop0.20.203.0在关机重启后，namenode启动报错：

1. 2011-10-21 05:22:20,504 INFO org.apache.hadoop.hdfs.server.common.Storage: Storage directory /tmp/hadoop-fzuir/dfs/name does not exist.
2. 2011-10-21 05:22:20,506 ERROR org.apache.hadoop.hdfs.server.namenode.FSNamesystem: FSNamesystem initialization failed.
3. org.apache.hadoop.hdfs.server.common.InconsistentFSStateException: Directory /tmp/hadoop-fzuir/dfs/name is in an inconsistent state: storage directory does not exist or is not accessible.
4. at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:291)
5. at org.apache.hadoop.hdfs.server.namenode.FSDirectory.loadFSImage(FSDirectory.java:97)
6. at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.initialize(FSNamesystem.java:379)
7. at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.<init>(FSNamesystem.java:353)
8. at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:254)
9. at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:434)
10. at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1153)
11. at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1162)

2011-10-21 05:22:20,504 INFO org.apache.hadoop.hdfs.server.common.Storage: Storage directory /tmp/hadoop-fzuir/dfs/name does not exist.
2011-10-21 05:22:20,506 ERROR org.apache.hadoop.hdfs.server.namenode.FSNamesystem: FSNamesystem initialization failed.
org.apache.hadoop.hdfs.server.common.InconsistentFSStateException: Directory /tmp/hadoop-fzuir/dfs/name is in an inconsistent state: storage directory does not exist or is not accessible.
at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:291)
at org.apache.hadoop.hdfs.server.namenode.FSDirectory.loadFSImage(FSDirectory.java:97)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.initialize(FSNamesystem.java:379)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.<init>(FSNamesystem.java:353)
at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:254)
at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:434)
at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1153)
at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1162)

这个以开始的解决方法是将namenode重新再format下，但是后面想想不对，这样每次都format，那不是玩完了~~

然后就搜了下，发现是因为临时文件/tmp会被删除掉，解决方法就是修改core-site.xml，添加hadoop.tmp.dir属性：

1. <property>
2. <name>hadoop.tmp.dir</name>
3. <value>/home/fzuir/Hadoop0.20.203.0/tmp/hadoop-${user.name}</value>
4. </property>

<property>
    <name>hadoop.tmp.dir</name>
    <value>/home/fzuir/Hadoop0.20.203.0/tmp/hadoop-${user.name}</value>
</property>

问题解决了，重启电脑后，再去启动hadoop就不会出现/dfs/name
is in an inconsistent state的错误了~~