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https://issues.apache.org/jira/browse/HDFS-8738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16723678#comment-16723678
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Xiang Li commented on HDFS-8738:
--------------------------------
Agree with Arpit. Add the link as a dup of HDFS-9572.
> Limit Exceptions thrown by DataNode when a client makes socket connection and
> sends an empty message
> ----------------------------------------------------------------------------------------------------
>
> Key: HDFS-8738
> URL: https://issues.apache.org/jira/browse/HDFS-8738
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 2.7.1
> Reporter: Rajesh Kartha
> Assignee: Rajesh Kartha
> Priority: Minor
> Attachments: HDFS-8738.001.patch
>
>
> When a client creates a socket connection to the Datanode and sends an empty
> message, the datanode logs have exceptions like these:
> 2015-07-08 20:00:55,427 ERROR datanode.DataNode (DataXceiver.java:run(278)) -
> bidev17.rtp.ibm.com:50010:DataXceiver error processing unknown operation
> src: /127.0.0.1:41508 dst: /127.0.0.1:50010
> java.io.EOFException
> at java.io.DataInputStream.readShort(DataInputStream.java:315)
> at
> org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.readOp(Receiver.java:58)
> at
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:227)
> at java.lang.Thread.run(Thread.java:745)
> 2015-07-08 20:00:56,671 ERROR datanode.DataNode (DataXceiver.java:run(278)) -
> bidev17.rtp.ibm.com:50010:DataXceiver error processing unknown operation
> src: /127.0.0.1:41509 dst: /127.0.0.1:50010
> java.io.EOFException
> at java.io.DataInputStream.readShort(DataInputStream.java:315)
> at
> org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.readOp(Receiver.java:58)
> at
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:227)
> at java.lang.Thread.run(Thread.java:745)
> These can fill up the logs and was recently noticed with an Ambari 2.1 based
> install which tries to check if the datanode is up.
> Can be easily reproduced with a simple Java client creating a Socket
> connection:
> public static void main(String[] args) {
> Socket DNClient;
> try {
> DNClient = new Socket("127.0.0.1", 50010);
> DataOutputStream os= new
> DataOutputStream(DNClient.getOutputStream());
> os.writeBytes("");
> os.close();
> } catch (UnknownHostException e) {
> // TODO Auto-generated catch block
> e.printStackTrace();
> } catch (IOException e) {
> // TODO Auto-generated catch block
> e.printStackTrace();
> }
> }
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