hadoop-장애(Name node is in safe mode.)
회사에 정전이 일어났다. hadoop 개발 장비가 모두 꺼졌다.. 재부팅을 하고 hadoop namenode 를 구동하니 아래와 같은 에러 발생…
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2013-01-03 08:30:29,803 INFO org.apache.hadoop.mapred.JobTracker: problem cleaning system directory: hdfs://namenode:9000/data1/hadoop/filesystem/mapreduce/system org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot delete /data1/hadoop/filesystem/mapreduce/system. Name node is in safe mode. The ratio of reported blocks 0.0000 has not reached the threshold 0.9990. Safe mode will be turned off automatically. at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.deleteInternal(FSNamesystem.java:1992) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.delete(FSNamesystem.java:1972) at org.apache.hadoop.hdfs.server.namenode.NameNode.delete(NameNode.java:792) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 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$1.run(Server.java:1384) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:396) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1083) at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1382) at org.apache.hadoop.ipc.Client.call(Client.java:1066) at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:225) at $Proxy5.delete(Unknown Source) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82) at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59) at $Proxy5.delete(Unknown Source) at org.apache.hadoop.hdfs.DFSClient.delete(DFSClient.java:828) at org.apache.hadoop.hdfs.DistributedFileSystem.delete(DistributedFileSystem.java:234) at org.apache.hadoop.mapred.JobTracker.<init>(JobTracker.java:2410) at org.apache.hadoop.mapred.JobTracker.</init><init>(JobTracker.java:2192) at org.apache.hadoop.mapred.JobTracker.</init><init>(JobTracker.java:2186) at org.apache.hadoop.mapred.JobTracker.startTracker(JobTracker.java:300) at org.apache.hadoop.mapred.JobTracker.startTracker(JobTracker.java:291) at org.apache.hadoop.mapred.JobTracker.main(JobTracker.java:4978) |
Hadoop이 정상적인 종료를 하지 않았을 때, 에러가 나는 것으로 보인다. 비정상적인 종료시 hadoop 은 safe 모드로 이동하는데. 종료시 아래와 같은 … Continue reading