运行bin/hdfs namenode -format报 WARN net.DNS: Unable to determine address of the host-falling back to "localhost" address
初始化HDFS系统
在hadop2.7.1目录下使用如下命令：
bin/hdfs namenode -format
多谢大家帮我分析一下，谢谢了!
出现以下报错：
17/03/12 20:01:39 INFO util.GSet: Computing capacity for map NameNodeRetryCache 17/03/12 20:01:39 INFO util.GSet: VM type = 64-bit 17/03/12 20:01:39 INFO util.GSet: 0.029999999329447746% max memory 889 MB = 273.1 KB 17/03/12 20:01:39 INFO util.GSet: capacity = 2^15 = 32768 entries Re-format filesystem in Storage Directory /chroot/hadoop/tmp/dfs/name ? (Y or N) Y 17/03/12 20:01:41 WARN net.DNS: Unable to determine local hostname -falling back to "localhost" java.net.UnknownHostException: iZwz97cbcapiyem3o09u09Z: iZwz97cbcapiyem3o09u09Z: Name or service not known at java.net.InetAddress.getLocalHost(InetAddress.java:1505) at org.apache.hadoop.net.DNS.resolveLocalHostname(DNS.java:264) at org.apache.hadoop.net.DNS.<clinit>(DNS.java:57) at org.apache.hadoop.hdfs.server.namenode.NNStorage.newBlockPoolID(NNStorage.java:966) at org.apache.hadoop.hdfs.server.namenode.NNStorage.newNamespaceInfo(NNStorage.java:575) at org.apache.hadoop.hdfs.server.namenode.FSImage.format(FSImage.java:157) at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:991) at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1429) at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1554) Caused by: java.net.UnknownHostException: iZwz97cbcapiyem3o09u09Z: Name or service not known at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method) at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928) at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323) at java.net.InetAddress.getLocalHost(InetAddress.java:1500) ... 8 more 17/03/12 20:01:41 WARN net.DNS: Unable to determine address of the host-falling back to "localhost" address java.net.UnknownHostException: iZwz97cbcapiyem3o09u09Z: iZwz97cbcapiyem3o09u09Z: Name or service not known at java.net.InetAddress.getLocalHost(InetAddress.java:1505) at org.apache.hadoop.net.DNS.resolveLocalHostIPAddress(DNS.java:287) at org.apache.hadoop.net.DNS.<clinit>(DNS.java:58) at org.apache.hadoop.hdfs.server.namenode.NNStorage.newBlockPoolID(NNStorage.java:966) at org.apache.hadoop.hdfs.server.namenode.NNStorage.newNamespaceInfo(NNStorage.java:575) at org.apache.hadoop.hdfs.server.namenode.FSImage.format(FSImage.java:157) at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:991) at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1429) at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1554) Caused by: java.net.UnknownHostException: iZwz97cbcapiyem3o09u09Z: Name or service not known at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method) at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928) at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323) at java.net.InetAddress.getLocalHost(InetAddress.java:1500) ... 8 more 17/03/12 20:01:41 INFO namenode.FSImage: Allocated new BlockPoolId: BP-612298536-127.0.0.1-1489320101369 17/03/12 20:01:41 INFO common.Storage: Storage directory /chroot/hadoop/tmp/dfs/name has been successfully formatted. 17/03/12 20:01:41 INFO namenode.NNStorageRetentionManager: Going to retain 1 images with txid >= 0 17/03/12 20:01:41 INFO util.ExitUtil: Exiting with status 0 17/03/12 20:01:41 INFO namenode.NameNode: SHUTDOWN_MSG: /************************************************************ SHUTDOWN_MSG: Shutting down NameNode at java.net.UnknownHostException: iZwz97cbcapiyem3o09u09Z: iZwz97cbcapiyem3o09u09Z: Name or service not known ************************************************************/
输出的最顶部有一句：
STARTUP_MSG: Starting NameNode STARTUP_MSG: host = java.net.UnknownHostException: iZwz97cbcapiyem3o09u09Z: iZwz97cbcapiyem3o09u09Z: Name or service not known
