[jira] [Created] (HDFS-7899) Improve EOF error message

["Harsh J (JIRA)" <ji...@apache.org>]

Harsh J created HDFS-7899:
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             Summary: 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
            Priority: Minor


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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