hadoop namenode起不來

週一發現hadoop集羣down掉了

發現由於磁盤已滿100%

刪除無用文件後重啓集羣，發現還是起不來，錯誤如下：

/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG:   host = SFserver141.localdomain/192.168.15.141
STARTUP_MSG:   args = []
STARTUP_MSG:   version = 0.20.3-SNAPSHOT
STARTUP_MSG:   build =  -r ; compiled by 'root' on Wed Jun  8 12:43:33 CST 2011
************************************************************/
2012-10-22 08:50:42,096 INFO org.apache.hadoop.ipc.metrics.RpcMetrics: Initializing RPC Metrics with hostName=NameNode, port=9000
2012-10-22 08:50:42,104 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: Namenode up at: SFserver141.localdomain/192.168.15.141:9000
2012-10-22 08:50:42,112 INFO org.apache.hadoop.metrics.jvm.JvmMetrics: Initializing JVM Metrics with processName=NameNode, sessionId=null
2012-10-22 08:50:42,113 INFO org.apache.hadoop.hdfs.server.namenode.metrics.NameNodeMetrics: Initializing NameNodeMeterics using context object:org.apache.hadoop.metrics.spi.NullContext
2012-10-22 08:50:42,169 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: fsOwner=root,root,bin,daemon,sys,adm,disk,wheel
2012-10-22 08:50:42,169 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: supergroupsupergroup=supergroup
2012-10-22 08:50:42,169 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: isPermissionEnabled=false
2012-10-22 08:50:42,187 INFO org.apache.hadoop.hdfs.server.namenode.metrics.FSNamesystemMetrics: Initializing FSNamesystemMetrics using context object:org.apache.hadoop.metrics.spi.NullContext
2012-10-22 08:50:42,188 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Registered FSNamesystemStatusMBean
2012-10-22 08:50:42,248 INFO org.apache.hadoop.hdfs.server.common.Storage: Number of files = 799968
2012-10-22 08:50:47,535 INFO org.apache.hadoop.hdfs.server.common.Storage: Number of files under construction = 13
2012-10-22 08:50:47,540 INFO org.apache.hadoop.hdfs.server.common.Storage: Image file of size 102734547 loaded in 5 seconds.
2012-10-22 08:50:48,131 INFO org.apache.hadoop.hdfs.server.common.Storage: Edits file /data/java/hadoop020/data/dfs.name.dir/current/edits of size 2749136 edits # 17772 loaded in 0 seconds.
2012-10-22 08:50:48,801 ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: java.lang.NumberFormatException: For input string: ""
        at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
        at java.lang.Integer.parseInt(Integer.java:470)
        at java.lang.Short.parseShort(Short.java:120)
        at java.lang.Short.parseShort(Short.java:78)
        at org.apache.hadoop.hdfs.server.namenode.FSEditLog.readShort(FSEditLog.java:1311)
        at org.apache.hadoop.hdfs.server.namenode.FSEditLog.loadFSEdits(FSEditLog.java:541)
        at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSEdits(FSImage.java:1011)
        at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:826)
        at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:364)
        at org.apache.hadoop.hdfs.server.namenode.FSDirectory.loadFSImage(FSDirectory.java:87)
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.initialize(FSNamesystem.java:315)
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.<init>(FSNamesystem.java:296)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:205)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:283)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:986)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:995)

2012-10-22 08:50:48,802 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at SFserver141.localdomain/192.168.15.141
************************************************************/

大致是因爲edits這個文件出現問題；

上網查了不少文檔，但由於沒有設置secondarynamenode；所以沒有edits的鏡像文件

之後發現一篇文章寫：

printf "\xff\xff\xff\xee\xff" > edits

把上面一段字符串寫到edits文件中

重啓正常

注：dfs.name.dir/current文件夾下還出現了edits.new的文件，我是刪除的 不知道有沒有影響