我想使用Distcp将数据从HA群集复制到Non HA群集。 我正在使用以下命令：
hadoop distcp hdfs：// nameserviceofHAcluster / apps / hive / warehouse / tabletobecopied hdfs：// namenode2 / apps / hive / warehouse /
但是它给出了以下错误：
17/08/11 06:53:56 ERROR tools.DistCp: Invalid arguments:
java.lang.IllegalArgumentException: java.net.UnknownHostException: namenode2
at org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:411)
at org.apache.hadoop.hdfs.NameNodeProxies.createNonHAProxy(NameNodeProxies.java:311)
at org.apache.hadoop.hdfs.NameNodeProxies.createProxy(NameNodeProxies.java:176)
at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:678)
at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:619)
at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:150)
at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2653)
at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:92)
at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2687)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2669)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:371)
at org.apache.hadoop.fs.Path.getFileSystem(Path.java:295)
at org.apache.hadoop.tools.DistCp.setTargetPathExists(DistCp.java:224)
at org.apache.hadoop.tools.DistCp.run(DistCp.java:116)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
at org.apache.hadoop.tools.DistCp.main(DistCp.java:454)
引起：java.net.UnknownHostException：namenode2 ......还有16个