FAQ
Is the server down for any reason ? may be system panic and didn't reboot itself ? What OS is the datanode?

The datanode is unreachable on the network...





________________________________
From: "y_823910@tsmc.com" <y_823910@tsmc.com>
To: common-user@hadoop.apache.org
Sent: Fri, March 26, 2010 2:11:50 AM
Subject: Datanode abort

Hi,
My datanode disappeared for unknown reason.
Following is the log, any suggestions would be appreciated!


java.net.SocketTimeoutException: 480000 millis timeout while waiting for
channel to be ready for write. ch :
java.nio.channels.SocketChannel[connected local=/10.81.47.50:50010
remote=/10.81.47.35:34325]
at
org.apache.hadoop.net.SocketIOWithTimeout.waitForIO(SocketIOWithTimeout.java:246)
at
org.apache.hadoop.net.SocketOutputStream.waitForWritable(SocketOutputStream.java:159)
at
org.apache.hadoop.net.SocketOutputStream.transferToFully(SocketOutputStream.java:198)
at
org.apache.hadoop.hdfs.server.datanode.BlockSender.sendChunks(BlockSender.java:313)
at
org.apache.hadoop.hdfs.server.datanode.BlockSender.sendBlock(BlockSender.java:400)
at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:180)
at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:95)
at java.lang.Thread.run(Thread.java:619)

2010-03-26 15:53:30,910 ERROR
org.apache.hadoop.hdfs.server.datanode.DataNode:
DatanodeRegistration(10.81.47.50:50010,
storageID=DS-758373957-10.81.47.50-50010-1264018078483, infoPort=50075,
ipcPort=50020):DataXceiver
java.net.SocketTimeoutException: 480000 millis timeout while waiting for
channel to be ready for write. ch :
java.nio.channels.SocketChannel[connected local=/10.81.47.50:50010
remote=/10.81.47.35:34325]
at
org.apache.hadoop.net.SocketIOWithTimeout.waitForIO(SocketIOWithTimeout.java:246)
at
org.apache.hadoop.net.SocketOutputStream.waitForWritable(SocketOutputStream.java:159)
at
org.apache.hadoop.net.SocketOutputStream.transferToFully(SocketOutputStream.java:198)
at
org.apache.hadoop.hdfs.server.datanode.BlockSender.sendChunks(BlockSender.java:313)
at
org.apache.hadoop.hdfs.server.datanode.BlockSender.sendBlock(BlockSender.java:400)
at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:180)
at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:95)
at java.lang.Thread.run(Thread.java:619)




Fleming Chiu(邱宏明)
707-6128
y_823910@tsmc.com
週一無肉日吃素救地球(Meat Free Monday Taiwan)


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