datanode不会启动

6ju8rftf 于 2021-06-03 发布在 Hadoop

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我正在尝试使用cloudera管理器建立一个单节点集群，下面是我遇到的最新问题。
当我尝试启动所有服务时，hdfs不会启动，这似乎是datanode的问题—它给出的致命错误消息是

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时，它会发出以下警告：

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google上看，问题似乎与使用的ip地址有关，问题的根源可能在my/etc/hosts文件中，如下所示。

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

hadoop cloudera cloudera-manager

来源：https://stackoverflow.com/questions/19466340/setting-up-hadoop-with-cloudera-manager-in-pseudo-distributed-mode-datanode-wo

1条答案

按热度按时间

pes8fvy91#

对它进行了排序，我没有在/etc/hosts文件中使用127.0.1.1，而是使用ifconfig的点到点部分中的机器的ip地址。
ifconfig的输出将有一个类似

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)

从这里获取inet addr:ip。
或者跑

ifconfig | grep P-t-P

准确的路线。

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datanode不会启动

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