我正在尝试使用 Cloudera Manager 设置单节点集群,这是我遇到的最新问题。
当我尝试启动所有服务时,HDFS 无法启动,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,它会给出以下警告:
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.
从谷歌搜索来看,问题似乎与使用的 IP 地址有关,问题的根源可能在我的 /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