所以我删除了我的主机，然后试图再次添加它。datanode工作正常，但是nodemanager无法工作。在删除hadoop包之后，我用yum删除了hadoop包，然后用ambari再次安装了它。现在，当我尝试使用ambari启动nodemanager时，出现以下错误：

2014-05-23 19:40:41,507 - Execute['export HADOOP_LIBEXEC_DIR=/usr/lib/hadoop/libexec && /usr/lib/hadoop-yarn/sbin/yarn-daemon.sh --config /etc/hadoop/conf start nodemanager'] {'not_if': 'ls /var/run/hadoop-yarn/yarn/yarn-yarn-nodemanager.pid >/dev/null 2>&1 && ps `cat /var/run/hadoop-yarn/yarn/yarn-yarn-nodemanager.pid` >/dev/null 2>&1', 'user': 'yarn'}
2014-05-23 19:40:42,570 - Execute['ls /var/run/hadoop-yarn/yarn/yarn-yarn-nodemanager.pid >/dev/null 2>&1 && ps `cat /var/run/hadoop-yarn/yarn/yarn-yarn-nodemanager.pid` >/dev/null 2>&1'] {'initial_wait': 5, 'not_if': 'ls /var/run/hadoop-yarn/yarn/yarn-yarn-nodemanager.pid >/dev/null 2>&1 && ps `cat /var/run/hadoop-yarn/yarn/yarn-yarn-nodemanager.pid` >/dev/null 2>&1', 'user': 'yarn'}
2014-05-23 19:40:47,621 - Error while executing command 'start':
Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py", line 112, in execute
    method(env)
  File "/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/services/YARN/package/scripts/nodemanager.py", line 42, in start
    action='start'
  File "/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/services/YARN/package/scripts/service.py", line 51, in service
    initial_wait=5
  File "/usr/lib/python2.6/site-packages/resource_management/core/base.py", line 148, in __init__
    self.env.run()
  File "/usr/lib/python2.6/site-packages/resource_management/core/environment.py", line 149, in run
    self.run_action(resource, action)
  File "/usr/lib/python2.6/site-packages/resource_management/core/environment.py", line 115, in run_action
    provider_action()
  File "/usr/lib/python2.6/site-packages/resource_management/core/providers/system.py", line 239, in action_run
    raise ex
Fail: Execution of 'ls /var/run/hadoop-yarn/yarn/yarn-yarn-nodemanager.pid >/dev/null 2>&1 && ps `cat /var/run/hadoop-yarn/yarn/yarn-yarn-nodemanager.pid` >/dev/null 2>&1' returned 1.

所以我不太明白问题所在。如果我尝试用yarn nodemanager start手动启动它，会出现以下错误：

14/07/10 13:44:48 FATAL nodemanager.NodeManager: Error starting NodeManager
org.apache.hadoop.yarn.exceptions.YarnRuntimeException: org.apache.hadoop.yarn.exceptions.YarnRuntimeException: Recieved SHUTDOWN signal from Resourcemanager ,Registration of NodeManager failed, Message from ResourceManager: Disallowed NodeManager from  r3888, Sending SHUTDOWN signal to the NodeManager.
        at org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl.serviceStart(NodeStatusUpdaterImpl.java:196)
        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:197)
        at org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
        at org.apache.hadoop.yarn.server.nodemanager.NodeManager.initAndStartNodeManager(NodeManager.java:358)
        at org.apache.hadoop.yarn.server.nodemanager.NodeManager.main(NodeManager.java:404)
Caused by: org.apache.hadoop.yarn.exceptions.YarnRuntimeException: Recieved SHUTDOWN signal from Resourcemanager ,Registration of NodeManager failed, Message from ResourceManager: Disallowed NodeManager from  r3888, Sending SHUTDOWN signal to the NodeManager.
        at org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl.registerWithRM(NodeStatusUpdaterImpl.java:265)
        at org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl.serviceStart(NodeStatusUpdaterImpl.java:190)
        ... 6 more
14/07/10 13:44:48 INFO nodemanager.NodeManager: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NodeManager at r3888

是否有人在使用ambari的主机上删除/添加namenode时遇到类似问题？我想避免完全从地面设置主机。