Hadoop0.20.203.0在關機重啓後，namenode啓動報錯（/dfs/name is in an inconsistent state）

Hadoop0.20.203.0在關機重啓後，namenode啓動報錯：

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)

這個以開始的解決方法是將namenode重新再format下，但是後面想想不對，這樣每次都format，那不是玩完了~~

然後就搜了下，發現是因爲臨時文件/tmp會被刪除掉，解決方法就是修改core-site.xml，添加hadoop.tmp.dir屬性：

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

問題解決了，重啓電腦後，再去啓動hadoop就不會出現/dfs/name is in an inconsistent state的錯誤了~~