服务器异常关机，启动yarn nodemanager 报错 Corruption: checksum mismatch 处理方法_error starting nodemanager org.apache.hadoop.servi-优快云博客

本文记录了一次服务器宕机后，NodeManager启动失败的问题排查与解决过程。详细解析了日志中的错误信息，确定为文件校验不通过导致的问题，并通过删除特定日志目录后成功重启NodeManager。

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偶遇服务器宕机，服务器中很多文件损坏，启动nodemanager时，一直报错，日志如下，感觉是某个文件损坏造成的

2019-05-16 16:11:35,195 FATAL nodemanager.NodeManager (NodeManager.java:initAndStartNodeManager(549)) - Error starting NodeManager
org.apache.hadoop.service.ServiceStateException: org.fusesource.leveldbjni.internal.NativeDB$DBException: Corruption: checksum mismatch
	at org.apache.hadoop.service.ServiceStateException.convert(ServiceStateException.java:59)
	at org.apache.hadoop.service.AbstractService.start(AbstractService.java:204)
	at org.apache.hadoop.yarn.server.nodemanager.containermanager.AuxServices.serviceStart(AuxServices.java:178)
	at org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
	at org.apache.hadoop.service.CompositeService.serviceStart(CompositeService.java:120)
	at org.apache.hadoop.yarn.server.nodemanager.containermanager.ContainerManagerImpl.serviceStart(ContainerManagerImpl.java:457)
	at org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
	at org.apache.hadoop.service.CompositeService.serviceStart(CompositeService.java:120)
	at org.apache.hadoop.yarn.server.nodemanager.NodeManager.serviceStart(NodeManager.java:302)
	at org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
	at org.apache.hadoop.yarn.server.nodemanager.NodeManager.initAndStartNodeManager(NodeManager.java:547)
	at org.apache.hadoop.yarn.server.nodemanager.NodeManager.main(NodeManager.java:594)
Caused by: org.fusesource.leveldbjni.internal.NativeDB$DBException: Corruption: checksum mismatch
	at org.fusesource.leveldbjni.internal.NativeDB.checkStatus(NativeDB.java:200)
	at org.fusesource.leveldbjni.internal.NativeDB.open(NativeDB.java:218)
	at org.fusesource.leveldbjni.JniDBFactory.open(JniDBFactory.java:168)
	at org.apache.hadoop.mapred.ShuffleHandler.startStore(ShuffleHandler.java:596)
	at org.apache.hadoop.mapred.ShuffleHandler.recoverState(ShuffleHandler.java:564)
	at org.apache.hadoop.mapred.ShuffleHandler.serviceStart(ShuffleHandler.java:499)
	at org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
	... 10 more

从日志中得知是某个文件校验不通过，造成nodemanager无法启动，尝试删除/var/log/hadoop-yarn/ 重启nodemanager，问题得以解决