服务器检查的时候，发现存在HDFS上的文件无法同步，再发现Hadoop停掉了。进行重启，重启不成功。
查看Hadoop日志：
2014-07-30 14:15:42,025 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Roll Edit Log from 192.168.206.133
<span>2014-07-30 14:15:42,026 WARN org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Cannot roll edit log, edits.new files already exists in all healthy directories:
/home/hadoop/hdfs/name/current/edits.new</span>
<span>2014-07-30 14:17:17,853 ERROR org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Unable to sync edit log.
java.io.IOException: No space left on device</span>
at sun.nio.ch.FileChannelImpl.force0(Native Method)
at sun.nio.ch.FileChannelImpl.force(FileChannelImpl.java:348)
at org.apache.hadoop.hdfs.server.namenode.FSEditLog$EditLogFileOutputStream.flushAndSync(FSEditLog.java:215)
at org.apache.hadoop.hdfs.server.namenode.EditLogOutputStream.flush(EditLogOutputStream.java:89)
at org.apache.hadoop.hdfs.server.namenode.FSEditLog.logSync(FSEditLog.java:1017)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFile(FSNamesystem.java:1190)
at org.apache.hadoop.hdfs.server.namenode.NameNode.create(NameNode.java:628)
at sun.reflect.GeneratedMethodAccessor300.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:563)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1388)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1384)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1382)
2014-07-30 14:17:17,853 FATAL org.apache.hadoop.hdfs.server.namenode.FSNamesystem: No edit streams are accessible
java.lang.Exception: No edit streams are accessible
at org.apache.hadoop.hdfs.server.namenode.FSEditLog.fatalExit(FSEditLog.java:388)
at org.apache.hadoop.hdfs.server.namenode.FSEditLog.exitIfNoStreams(FSEditLog.java:407)
at org.apache.hadoop.hdfs.server.namenode.FSEditLog.removeEditsAndStorageDir(FSEditLog.java:432)
at org.apache.hadoop.hdfs.server.namenode.FSEditLog.removeEditsStreamsAndStorageDirs(FSEditLog.java:470)
at org.apache.hadoop.hdfs.server.namenode.FSEditLog.logSync(FSEditLog.java:1030)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFile(FSNamesystem.java:1190)
at org.apache.hadoop.hdfs.server.namenode.NameNode.create(NameNode.java:628)
at sun.reflect.GeneratedMethodAccessor300.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:563)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1388)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1384)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1382)
--------------------------------------分割线 --------------------------------------
Ubuntu 13.04上搭建Hadoop环境
Ubuntu 12.10 +Hadoop 1.2.1版本集群配置
--------------------------------------分割线 --------------------------------------
空间满了。
使用命令df -h查看其中一个datanode，果然
但使用du -s查看，但显示只使用几百G，并没有满
这个实候确实让人费解，只好重启datanode所在的服务器，并重新挂载，回复原样，容量显示正常。