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我想使用 Distcp 将数据从 HA 集群复制到非 HA 集群。我为此目的使用以下命令：

hadoop distcp hdfs://nameserviceofHAcluster/apps/hive/warehouse/tabletobecopied hdfs://namenode2/apps/hive/warehouse/

但它给出了以下错误：

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 ... 16 更多

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