hadoop-slaves datanode log

[Martinus Martinus <ma...@gmail.com>]

Hi,

I run my hadoop job and when I opened my datanode logs I found many of
these messages :

2012-01-17 23:59:32,756 WARN
org.apache.hadoop.hdfs.server.datanode.DataNode:
java.net.SocketTimeoutException: Call to uvm12dk/172.16.4.147:9000 failed
on socket timeout exception: java.net.SocketTimeoutException: 20000 millis
timeout while waiting for channel to be ready for connect. ch :
java.nio.channels.SocketChannel[connection-pending remote=uvm12dk/
172.16.4.147:9000]
    at org.apache.hadoop.ipc.Client.wrapException(Client.java:771)
    at org.apache.hadoop.ipc.Client.call(Client.java:743)
    at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:220)
    at $Proxy4.sendHeartbeat(Unknown Source)
    at
org.apache.hadoop.hdfs.server.datanode.DataNode.offerService(DataNode.java:702)
    at
org.apache.hadoop.hdfs.server.datanode.DataNode.run(DataNode.java:1186)
    at java.lang.Thread.run(Thread.java:662)
Caused by: java.net.SocketTimeoutException: 20000 millis timeout while
waiting for channel to be ready for connect. ch :
java.nio.channels.SocketChannel[connection-pending remote=uvm12dk/
172.16.4.147:9000]
    at
org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:213)
    at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:404)
    at
org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:304)
    at org.apache.hadoop.ipc.Client$Connection.access$1700(Client.java:176)
    at org.apache.hadoop.ipc.Client.getConnection(Client.java:860)
    at org.apache.hadoop.ipc.Client.call(Client.java:720)
    ... 5 more

2012-01-17 23:59:53,774 INFO org.apache.hadoop.ipc.Client: Retrying connect
to server: uvm12dk/172.16.4.147:9000. Already tried 0 time(s).

Is this message means that my slave nodes didn't do any work?

Thanks.