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https://issues.apache.org/jira/browse/HDFS-7899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14902465#comment-14902465
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Vinayakumar B commented on HDFS-7899:
-------------------------------------
I think it will be very difficult to make out diagnostic message from just an
EOF to show to client.
Message can be slightly altered to give a different look, ex: "Unexpected EOF
while trying read response" ?
Agree ?
> Improve EOF error message
> -------------------------
>
> Key: HDFS-7899
> URL: https://issues.apache.org/jira/browse/HDFS-7899
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Affects Versions: 2.6.0
> Reporter: Harsh J
> Assignee: Jagadesh Kiran N
> Priority: Minor
> Attachments: HDFS-7899-00.patch
>
>
> Currently, a DN disconnection for reasons other than connection timeout or
> refused messages, such as an EOF message as a result of rejection or other
> network fault, reports in this manner:
> {code}
> WARN org.apache.hadoop.hdfs.DFSClient: Failed to connect to /x.x.x.x:nnnn for
> block, add to deadNodes and continue. java.io.EOFException: Premature EOF: no
> length prefix available
> java.io.EOFException: Premature EOF: no length prefix available
> at
> org.apache.hadoop.hdfs.protocol.HdfsProtoUtil.vintPrefixed(HdfsProtoUtil.java:171)
>
> at
> org.apache.hadoop.hdfs.RemoteBlockReader2.newBlockReader(RemoteBlockReader2.java:392)
>
> at
> org.apache.hadoop.hdfs.BlockReaderFactory.newBlockReader(BlockReaderFactory.java:137)
>
> at
> org.apache.hadoop.hdfs.DFSInputStream.getBlockReader(DFSInputStream.java:1103)
>
> at org.apache.hadoop.hdfs.DFSInputStream.blockSeekTo(DFSInputStream.java:538)
> at
> org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:750)
>
> at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:794)
> at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:602)
> {code}
> This is not very clear to a user (warn's at the hdfs-client). It could likely
> be improved with a more diagnosable message, or at least the direct reason
> than an EOF.
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