Hi. There is some mismatch here.. what is the expected ip address of this > machine (or does it have multiple interfaces and properly routed)? Looking > at the "Receiving Block" message DN thinks its address is 192.168.253.20 but > NN thinks it is 253.32 (and client is able to connect using 253.32). > > If you want to find the destination ip that this DN is unable to connect > to, you can check client's log for this block number. >
Hmm, .253.32 is the client workstation (has only our test application with core-hadoop.jar + configs). The expected address of the DataNode should be 192.168.253.20. According to what I seen, the problem is in DataNode itself - it just throws the Datanoderegistration every so often: 2009-04-23 00:05:05,961 INFO org.apache.hadoop.dfs.DataNode: Receiving block blk_7209884038924026671_8033 src: /192.168.253.32:42932 dest: /192.168.253.32:50010 2009-04-23 00:05:05,962 INFO org.apache.hadoop.dfs.DataNode: writeBlock blk_7209884038924026671_8033 received exception java.net.NoR outeToHostException: No route to host 2009-04-23 00:05:05,962 ERROR org.apache.hadoop.dfs.DataNode: DatanodeRegistration(192.168.253.20:50010, storageID=DS-1790181121-127 .0.0.1-50010-1239123237447, infoPort=50075, ipcPort=50020):DataXceiver: java.net.NoRouteToHostException: No route to host at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:574) at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206) at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:402) at org.apache.hadoop.dfs.DataNode$DataXceiver.writeBlock(DataNode.java:1255) at org.apache.hadoop.dfs.DataNode$DataXceiver.run(DataNode.java:1092) at java.lang.Thread.run(Thread.java:619) Regards.