What version of Hadoop are you seeing this on?
On 15 May 2015, at 20:03, Puneet Kapoor <[email protected]<mailto:[email protected]>> wrote: Hey, Did you find any solution for this issue, we are seeing similar logs in our Data node logs. Appreciate any help. 2015-05-15 10:51:43,615 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: NttUpgradeDN1:50010:DataXceiver error processing WRITE_BLOCK operation src: /192.168.112.190:46253<http://192.168.112.190:46253/> dst: /192.168.151.104:50010<http://192.168.151.104:50010/> java.net.SocketTimeoutException: 60000 millis timeout while waiting for channel to be ready for read. ch : java.nio.channels.SocketChannel[connected local=/192.168.151.104:50010<http://192.168.151.104:50010/> remote=/192.168.112.190:46253<http://192.168.112.190:46253/>] at org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:164) at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:161) at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:131) at java.io.BufferedInputStream.fill(Unknown Source) at java.io.BufferedInputStream.read1(Unknown Source) at java.io.BufferedInputStream.read(Unknown Source) at java.io.DataInputStream.read(Unknown Source) 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:446) at org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receiveBlock(BlockReceiver.java:702) at org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:742) at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opWriteBlock(Receiver.java:124) at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:71) at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:232) at java.lang.Thread.run(Unknown Source) That's being logged @ error level in DN. It doesn't mean the DN has crashed, only that it timed out waiting for data: something has gone wrong elsewhere. https://issues.apache.org/jira/browse/HDFS-693 there's a couple of properties you can do to extend timeouts <property> <name>dfs.socket.timeout</name> <value>20000</value> </property> <property> <name>dfs.datanode.socket.write.timeout</name> <value>20000</value> </property> You can also increase the number of data node tranceiver threads to handle data IO across the network <property> <name>dfs.datanode.max.xcievers</name> <value>4096</value> </property> Yes, that property has that explicit spellinng, it's easy to get wrong
