Exceptions in Data node log

[Vimal Jain <vk...@gmail.com>]

Hi,
I am using Hadoop and Hbase in pseudo distributed mode.
I am using  Hadoop version - 1.1.2 , Hbase version - 0.94.7 .

I am receiving following error messages in data node log.

hadoop-hadoop-datanode-woody.log:2013-10-24 10:55:37,579 WARN
org.apache.hadoop.hdfs.server.datanode.DataNode: DatanodeRegistration(
192.168.20.30:5001
0, storageID=DS-1816106352-192.168.20.30-50010-1369314076237,
infoPort=50075, ipcPort=50020):Got exception while serving
blk_4378636005274237256_55385
 to /192.168.20.30:
hadoop-hadoop-datanode-woody.log:java.net.SocketTimeoutException: 480000
millis timeout while waiting for channel to be ready for write. ch :
java.nio
.channels.SocketChannel[connected local=/192.168.20.30:50010 remote=/
192.168.20.30:60739]
hadoop-hadoop-datanode-woody.log:2013-10-24 10:55:37,603 ERROR
org.apache.hadoop.hdfs.server.datanode.DataNode: DatanodeRegistration(
192.168.20.30:500
10, storageID=DS-1816106352-192.168.20.30-50010-1369314076237,
infoPort=50075, ipcPort=50020):DataXceiver
hadoop-hadoop-datanode-woody.log:java.net.SocketTimeoutException: 480000
millis timeout while waiting for channel to be ready for write. ch :
java.nio
.channels.SocketChannel[connected local=/192.168.20.30:50010 remote=/
192.168.20.30:60739]


Please help in understanding the cause behind this.
-- 
Thanks and Regards,
Vimal Jain