Hello,   I have an 7 node cluster (6 datanodes) and I am executing HDFSClient Put from an application outside the cloudera cluster. Internally the cluster is configured to use an internal IP (172.x.x.x range)   I get the error below when I issue a hdfs put to the name node ... note the IP returned is172.123.123.123:50010 which is the internal ip address and not accessible from the application host.   HDFS 2015-09-22 19:26:48.292+01:00 INFO [Thread-11] org.apache.hadoop.hdfs.DFSClient - Exception in createBlockOutputStream org.apache.hadoop.net.ConnectTimeoutException: 60000 millis timeout while waiting for channel to be ready for connect. ch : java.nio.channels.SocketChannel[connection-pending remote=/172.123.123.123:50010] at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:534) ~[hadoop-common-2.7.0.jar!/:na] at org.apache.hadoop.hdfs.DFSOutputStream.createSocketForPipeline(DFSOutputStream.java:1610) ~[hadoop-hdfs-2.6.0.jar!/:na] at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.createBlockOutputStream(DFSOutputStream.java:1408) [hadoop-hdfs-2.6.0.jar!/:na] at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1361) [hadoop-hdfs-2.6.0.jar!/:na] at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:588) [hadoop-hdfs-2.6.0.jar!/:na] 2015-09-22 19:26:48.292+01:00 INFO [Thread-11] org.apache.hadoop.hdfs.DFSClient - Abandoning BP-383231650-172.16.1.45-1435792324508:blk_1074408707_667883 2015-09-22 19:26:48.316+01:00 INFO [Thread-11] org.apache.hadoop.hdfs.DFSClient - Excluding datanode 172.123.123.123:50010   Wildcard addresses is being used on datanode/namenode Also, I've tried enabling the following parameter to no avail:   dfs.datanode.use.datanode.hostname dfs.client.use.datanode.hostname      Is there any way to make the hostname be returned here instead of that IP?   Any pointers appreciated..  Brian ... View more