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From Chris Nauroth <cnaur...@hortonworks.com>
Subject Re: Datanode: DataXceiver error processing unknown operation
Date Mon, 13 Jun 2016 22:23:31 GMT
Hello Ram,

This indicates that a client connected to the DataNode's data transfer port but then immediately
disconnected before requesting an operation.  Sometimes monitoring tools will do this as a
liveness check to make sure the DataNode process is running and the port is reachable.  The
log message is harmless.  Apache Hadoop 2.8.0 will ship fix HDFS-9572 to prevent this message
from going into the logs.

<https://issues.apache.org/jira/browse/HDFS-9572><https://issues.apache.org/jira/browse/HDFS-9572>https://issues.apache.org/jira/browse/HDFS-9572

--Chris Nauroth

From: rammohan ganapavarapu <rammohanganap@gmail.com<mailto:rammohanganap@gmail.com>>
Date: Monday, June 13, 2016 at 2:02 PM
To: "user@hadoop.apache.org<mailto:user@hadoop.apache.org>" <user@hadoop.apache.org<mailto:user@hadoop.apache.org>>
Subject: Datanode: DataXceiver error processing unknown operation

Hi,

I am getting this error in datanode, not sure what it means and how to fix it, any one have
any suggestions?


2016-06-13 20:59:40,148 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: localhost:50010:DataXceiver
error processing unknown operation  src: /1.2.3.4:57308<http://1.2.3.4:57308> dst: /1.2.3.4:50010<http://1.2.3.4:50010>
java.io.EOFException

Thanks,
Ram

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