namenode没有启动

在进行远程debug时，误将datanode 的 debug也在namenode上面启动了

结果反复重启hadoop，和重启centos后没用

于是把tmp下，hdfs文件存储路径下东西关于datanode东西全删了，也没有用

于是hadoop namenode -format，没有格式化解决不了的问题

重启后发现datanode出现了

这是错误日志

2017-11-20 07:54:29,772 WARN org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Encountered exception loading fsimage
java.io.IOException: There appears to be a gap in the edit log.  We expected txid 1, but got txid 2906.
at org.apache.hadoop.hdfs.server.namenode.MetaRecoveryContext.editLogLoaderPrompt(MetaRecoveryContext.java:94)
at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadEditRecords(FSEditLogLoader.java:215)
at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadFSEdits(FSEditLogLoader.java:143)
at org.apache.hadoop.hdfs.server.namenode.FSImage.loadEdits(FSImage.java:885)
at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:738)
at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:316)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:1028)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:703)
at org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:634)
at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:695)
at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:905)
at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:884)
at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1610)
at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1678)
2017-11-20 07:54:29,783 INFO org.mortbay.log: Stopped HttpServer2$SelectChannelConnectorWithSafeStartup@0.0.0.0:50070
2017-11-20 07:54:29,787 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Stopping NameNode metrics system...
2017-11-20 07:54:29,787 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NameNode metrics system stopped.
2017-11-20 07:54:29,787 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NameNode metrics system shutdown complete.
2017-11-20 07:54:29,788 ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: Failed to start namenode.
java.io.IOException: There appears to be a gap in the edit log.  We expected txid 1, but got txid 2906.
at org.apache.hadoop.hdfs.server.namenode.MetaRecoveryContext.editLogLoaderPrompt(MetaRecoveryContext.java:94)
at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadEditRecords(FSEditLogLoader.java:215)
at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadFSEdits(FSEditLogLoader.java:143)
at org.apache.hadoop.hdfs.server.namenode.FSImage.loadEdits(FSImage.java:885)
at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:738)
at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:316)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:1028)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:703)
at org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:634)
at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:695)
at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:905)
at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:884)
at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1610)
at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1678)
2017-11-20 07:54:29,788 INFO org.apache.hadoop.util.ExitUtil: Exiting with status 1
2017-11-20 07:54:29,790 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: SHUTDOWN_MSG: 
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at master/192.168.200.128
************************************************************/