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

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

    [ https://issues.apache.org/jira/browse/HDFS-7899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14350180#comment-14350180 ] 

Harsh J commented on HDFS-7899:
-------------------------------

Maybe one simpler message could be "Received an empty response", catching that EOFException before bubbling it up.

> 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.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)