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From 周俊清 <2ho...@163.com>
Subject what happen in my hadoop cluster?
Date Wed, 27 Jul 2011 07:28:49 GMT
hello everyone,
    I got an exception from my jobtracker's log file as follow:
2011-07-27 01:58:04,197 INFO org.apache.hadoop.mapred.JobTracker: Cleaning up the system directory
2011-07-27 01:58:04,230 INFO org.apache.hadoop.mapred.JobTracker: problem cleaning system
directory:hdfs://dn224.pengyun.org:56900/home/hadoop/hadoop-tmp203/mapred/system
org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.hdfs.server.namenode.SafeModeException:Cannot
delete /home/hadoop/hadoop-tmp203/mapred/system. Name node is in safe mode.
The ratio of reported blocks 0.2915 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:1851)
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.delete(FSNamesystem.java:1831)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.delete(NameNode.java:691)
    ……
and
   the log message of namenode:
2011-07-27 00:00:00,219 INFO org.apache.hadoop.ipc.Server: IPC Server handler 1 on 56900,
call delete(/home/hadoop/hadoop-tmp203/mapred/system, true) from 192.168.1.224:5131
2: error: org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot delete /home/hadoop/hadoop-tmp203/mapred/system.
Name node is in safe mode.
The ratio of reported blocks 0.2915 has not reached the threshold 0.9990. Safe mode will be
turned off automatically.
org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot delete /home/hadoop/hadoop-tmp203/mapred/system.
Name node is in safe mode.
The ratio of reported blocks 0.2915 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:1851)
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.delete(FSNamesystem.java:1831)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.delete(NameNode.java:691)
    at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:523)
    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1383)
    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1379)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:396)
    at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
    at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1377)

 It means,I think,that the namenode is always being in the safe mode,so what can i do about
these exception.Anyone who can tell me why?I don't find the file "/home/hadoop/hadoop-tmp203/mapred/system"
in my system.The exception upon which appearing in the log file are repeated,even when I restart
my hadoop.
   thanks for your concern.



----------------------------
Junqing Zhou
2houjq@163.com


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