YARN集群配置错误导致的问题及解决-优快云博客

本文链接：https://blog.youkuaiyun.com/pany8125/article/details/47850165

在半夜调整集群配置后，遇到YARN服务挂起，nodemanager无法启动，错误日志显示null pointer异常。通过查阅资料，发现该问题是由于YARN-2816引起的。解决方案包括参考特定链接的解决步骤，删除namenode下的特定目录以恢复服务正常运行。

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半夜手贱，调整了下集群配置，发现yarn挂了，nodemanager一直起不来，查了下log是个null pointer，没看出来撒，结果google到这玩意。

https://issues.apache.org/jira/browse/YARN-2816

然后又看到这个

https://sskaje.me/2014/11/yarn-nodemanager-failed-start/

原来。。。

And, in the start-up message part,

2014-10-30 21:23:07,141 INFO org.apache.hadoop.yarn.server.nodemanager.NodeManager: registered UNIX signal handlers for [TERM, HUP, INT]
2014-10-30 21:23:08,259 INFO org.apache.hadoop.yarn.server.nodemanager.recovery.NMLeveldbStateStoreService: Using state database at /tmp/hadoop-yarn/yarn-nm-recovery/yarn-nm-state for recover
2014-10-30 21:23:08,291 INFO org.apache.hadoop.yarn.server.nodemanager.recovery.NMLeveldbStateStoreService$LeveldbLogger: Recovering log #432
2014-10-30 21:23:08,309 INFO org.apache.hadoop.yarn.server.nodemanager.recovery.NMLeveldbStateStoreService$LeveldbLogger: Delete type=0 #432
 
2014-10-30 21:23:08,309 INFO org.apache.hadoop.yarn.server.nodemanager.recovery.NMLeveldbStateStoreService$LeveldbLogger: Delete type=3 #431
 
2014-10-30 21:23:08,321 INFO org.apache.hadoop.yarn.server.nodemanager.recovery.NMLeveldbStateStoreService: Loaded NM state version info 1.0

The solution is, stop the instance, delete ‘/tmp/hadoop-yarn/’ from local filesystem, start the instance.

将每个namenode下的这个目录都删除后，终于恢复了，可以睡觉了。。。