使用Cloudera Manager以伪分布模式设置Hadoop - Datanode不会启动

Question

我试图使用Cloudera Manager设置单个节点群集，这里是我遇到的最新问题。

当我尝试启动所有服务，HDFS将无法启动，这似乎是与Datanode的一个问题 - 它给人的致命错误消息是

Initialization failed for block pool Block pool BP-1896453393-127.0.1.1-1382183730690 (storage id DS-185043233-127.0.1.1-50010-1382183775494) service to Hadoop1/127.0.1.1:8022 
org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException): Datanode denied communication with namenode: DatanodeRegistration(127.0.0.1, storageID=DS-185043233-127.0.1.1-50010-1382183775494, infoPort=50075, ipcPort=50020, storageInfo=lv=-40;cid=cluster25;nsid=1577346304;c=0) 
at org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager.registerDatanode(DatanodeManager.java:656) 
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.registerDatanode(FSNamesystem.java:3495) 
at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.registerDatanode(NameNodeRpcServer.java:899) 
at 
... 

当我运行主机检查器中，它提供了以下警告：

The following errors were found while checking /etc/hosts... 

The hostname Hadoop1 maps to 127.0.1.1 in /etc/hosts. 
This setting, typically found in Debian and Ubuntu environments, typically causes issues. 
We recommend either using the standard loopback address (127.0.0.1) or specifying the appropriate IP address for your host. 

从谷歌上搜索，似乎这个问题是关系到使用的IP地址，而问题的根源可能是我的/ etc/hosts文件，它看起来像这样。

127.0.0.1 localhost 
127.0.1.1 Hadoop1 

# The following lines are desirable for IPv6 capable hosts 
::1  ip6-localhost ip6-loopback 
fe00::0 ip6-localnet 
ff00::0 ip6-mcastprefix 
ff02::1 ip6-allnodes 
ff02::2 ip6-allrouters 

Answer 1

得到这个排序，而不是在/ etc使用127.0.1.1，/ hosts文件我用这是在ifconfig的执行点至点段的机器的IP地址。

使用ifconfig的输出将有像

ppp0  Link encap:Point-to-Point Protocol 
      inet addr:xxx.xxx.xxx.xxx P-t-P:xx.xx.xx.xx Mask:255.255.255.255 
      UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1440 Metric:1 
      RX packets:800950 errors:1 dropped:0 overruns:0 frame:0 
      TX packets:454479 errors:0 dropped:0 overruns:0 carrier:0 
      collisions:0 txqueuelen:3 
      RX bytes:1115444967 (1.1 GB) TX bytes:32007110 (32.0 MB) 

节就拿INET地址：该IP。

或者运行

ifconfig | grep P-t-P 

的确切行。