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From xeon Mailinglist <xeonmailingl...@gmail.com>
Subject java.net.SocketTimeoutException in the Datanode
Date Fri, 03 Jan 2014 23:55:55 GMT
I am running an wordcount example it MRv2, but I get this error in a
Datanode. It looks that it is a problem in the network between the Namenode
and the Datanode, but I am not sure.

What is this error? How can I fix this problem?

2014-01-03 16:46:29,319 INFO
org.apache.hadoop.hdfs.server.datanode.DataNode: opWriteBlock
BP-570096904-155.99.144.100-1388771741297:blk_-3952564661572372834_1072
received exception java.net.SocketTimeoutException: 60000 millis timeout
while waiting for channel to be ready for read. ch :
java.nio.channels.SocketChannel[connected local=/155.99.144.101:50010remote=/
155.99.144.101:44937]
2014-01-03 16:46:30,177 ERROR
org.apache.hadoop.hdfs.server.datanode.DataNode:
pcvm3-3.utahddc.geniracks.net:50010:DataXceiver error processing
WRITE_BLOCK operation  src: /155.99.144.101:44937 dest: /
155.99.144.101:50010
java.net.SocketTimeoutException: 60000 millis timeout while waiting for
channel to be ready for read. ch :
java.nio.channels.SocketChannel[connected local=/155.99.144.101:50010remote=/
155.99.144.101:44937]
        at
org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:164)
        at
org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:159)
        at
org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:129)
        at java.io.FilterInputStream.read(FilterInputStream.java:133)
        at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
        at java.io.BufferedInputStream.read1(BufferedInputStream.java:275)
        at java.io.BufferedInputStream.read(BufferedInputStream.java:334)
        at java.io.DataInputStream.read(DataInputStream.java:149)
        at org.apache.hadoop.io.IOUtils.readFully(IOUtils.java:192)
        at
org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.doReadFully(PacketReceiver.java:213)
        at
org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.doRead(PacketReceiver.java:134)
        at
org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.receiveNextPacket(PacketReceiver.java:109)
        at
org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receivePacket(BlockReceiver.java:414)
        at
org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receiveBlock(BlockReceiver.java:644)
        at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:506)
        at
org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opWriteBlock(Receiver.java:98)
        at
org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:65)
        at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:219)
        at java.lang.Thread.run(Thread.java:701)

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