Counldn't start hadoop datanode normally?

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I'd started datanode successfully before,but when I tried today it shows the following info,it sounds like I have not mkdir the /home/hadoop/appdata/hadoopdata directory,but I confrimed that the directory is already existed in my computer,so what's the problem?Why I couldn't start the datanode normally?THx.

Ex:I've tried delete the /home/hadoop/appdata/ and mkdir a new one,but it still doesn't work.

2014-03-04 09:30:30,106 WARN org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Source name ugi already exists!

2014-03-04 09:30:30,349 INFO org.apache.hadoop.hdfs.server.common.Storage: Cannot access storage directory /home/hadoop/appdata/hadoopdata

2014-03-04 09:30:30,350 INFO org.apache.hadoop.hdfs.server.common.Storage: Storage directory /home/hadoop/appdata/hadoopdata does not exist

2014-03-04 09:30:30,453 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: 

java.io.IOException: All specified directories are not accessible or do not exist.

    at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:139)
    at org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:414)
    at org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:321)
    at org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1712)
    at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1651)
    at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1669)
    at org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:1795)

asked 41 secs ago

user3377174

1