我已经设置了工作正常的 3 节点集群。现在我想在这个集群中再添加一个节点。我试过了，但是新节点没有添加到集群中。我的问题是在哪里可以找到此类问题的异常消息。如果我启动数据节点守护程序，它将在新节点中再启动一个，但如果我连接到集群，则名称节点正在停止数据节点守护程序。因为我猜是一些配置或目录权限问题，所以我怎样才能找出这些错误？这些错误可用哪个日志文件？
例外： - - - - - - -
013-06-14 18:20:33,987 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: NameNode up at: master/192.168.0.135:8020
2013-06-14 18:20:33,988 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Starting services required for active state
2013-06-14 18:20:34,371 ERROR org.apache.hadoop.security.UserGroupInformation: PriviledgedActionException as:hdfs (auth:SIMPLE) cause:org.apache.hadoop.hdfs.server.namenode.SafeModeException: Log not rolled. Name node is in safe mode.
The reported blocks 0 needs additional 374 blocks to reach the threshold 0.9990 of total blocks 374. Safe mode will be turned off automatically.
2013-06-14 18:20:34,371 INFO org.apache.hadoop.ipc.Server: IPC Server handler 1 on 8020, call org.apache.hadoop.hdfs.server.protocol.NamenodeProtocol.rollEditLog from 192.168.0.115:33532: error: org.apache.hadoop.hdfs.server.namenode.SafeModeException: Log not rolled. Name node is in safe mode.
The reported blocks 0 needs additional 374 blocks to reach the threshold 0.9990 of total blocks 374. Safe mode will be turned off automatically.
org.apache.hadoop.hdfs.server.namenode.SafeModeException: Log not rolled. Name node is in safe mode.
The reported blocks 0 needs additional 374 blocks to reach the threshold 0.9990 of total blocks 374. Safe mode will be turned off automatically.
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.rollEditLog(FSNamesystem.java:4433)
at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.rollEditLog(NameNodeRpcServer.java:734)
at org.apache.hadoop.hdfs.protocolPB.NamenodeProtocolServerSideTranslatorPB.rollEditLog(NamenodeProtocolServerSideTranslatorPB.java:129)
at org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos$NamenodeProtocolService$2.callBlockingMethod(NamenodeProtocolProtos.java:8762)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:453)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:898)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1693)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1689)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1332)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1687)
2013-06-14 18:21:34,395 ERROR org.apache.hadoop.security.UserGroupInformation: PriviledgedActionException as:hdfs (auth:SIMPLE) cause:org.apache.hadoop.hdfs.server.namenode.SafeModeException: Log not rolled. Name node is in safe mode.
The reported blocks 0 needs additional 374 blocks to reach the threshold 0.9990 of total blocks 374. Safe mode will be turned off automatically.
2013-06-14 18:21:34,395 INFO org.apache.hadoop.ipc.Server: IPC Server handler 4 on 8020, call org.apache.hadoop.hdfs.server.protocol.NamenodeProtocol.rollEditLog from 192.168.0.115:33534: error: org.apache.hadoop.hdfs.server.namenode.SafeModeException: Log not rolled. Name node is in safe mode.
The reported blocks 0 needs additional 374 blocks to reach the threshold 0.9990 of total blocks 374. Safe mode will be turned off automatically.
org.apache.hadoop.hdfs.server.namenode.SafeModeException: Log not rolled. Name node is in safe mode.
The reported blocks 0 needs additional 374 blocks to reach the threshold 0.9990 of total blocks 374. Safe mode will be turned off automatically.
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.rollEditLog(FSNamesystem.java:4433)
at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.rollEditLog(NameNodeRpcServer.java:734)
at org.apache.hadoop.hdfs.protocolPB.NamenodeProtocolServerSideTranslatorPB.rollEditLog(NamenodeProtocolServerSideTranslatorPB.java:129)
at org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos$NamenodeProtocolService$2.callBlockingMethod(NamenodeProtocolProtos.java:8762)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:453)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:898)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1693)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1689)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1332)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1687)