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From Stephen Boesch <java...@gmail.com>
Subject Hint on EOFException's on datanodes
Date Fri, 24 May 2013 05:38:51 GMT
On a smallish (10 node) cluster with only 2 mappers per node after a few
minutes EOFExceptions are cropping up on the datanodes: an example is shown
below.

Any hint on what to tweak/change in hadoop / cluster settings to make this
more happy?


2013-05-24 05:03:57,460 INFO
org.apache.hadoop.hdfs.server.datanode.DataNode
(org.apache.hadoop.hdfs.server.datanode.DataXceiver@1b1accfc): writeBlock
blk_7760450154173670997_48372 received exception java.io.EOFException:
while trying to read 65557 bytes
2013-05-24 05:03:57,262 INFO
org.apache.hadoop.hdfs.server.datanode.DataNode (PacketResponder 0 for
Block blk_-3990749197748165818_48331): PacketResponder 0 for block
blk_-3990749197748165818_48331 terminating
2013-05-24 05:03:57,460 ERROR
org.apache.hadoop.hdfs.server.datanode.DataNode
(org.apache.hadoop.hdfs.server.datanode.DataXceiver@1b1accfc):
DatanodeRegistration(10.254.40.79:9200,
storageID=DS-1106090267-10.254.40.79-9200-1369343833886, infoPort=9102,
ipcPort=9201):DataXceiver
java.io.EOFException: while trying to read 65557 bytes
        at
org.apache.hadoop.hdfs.server.datanode.BlockReceiver.readToBuf(BlockReceiver.java:268)
        at
org.apache.hadoop.hdfs.server.datanode.BlockReceiver.readNextPacket(BlockReceiver.java:312)
        at
org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receivePacket(BlockReceiver.java:376)
        at
org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receiveBlock(BlockReceiver.java:532)
        at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:406)
        at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:112)
        at java.lang.Thread.run(Thread.java:662)
2013-05-24 05:03:57,261 INFO org.apache.hadoop.hdfs.server.datanode.Dat

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