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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1787) "Not enough xcievers" error should propagate to client
Date Sat, 11 Jun 2011 18:51:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13047971#comment-13047971
] 

Tsz Wo (Nicholas), SZE commented on HDFS-1787:
----------------------------------------------

> I believe this is already an error path, but I'll look into this more.

Yes, please see if you can test it and how actual exceptions look like.


> My plan is to add \n's to the log message.

If it is separated into two calls, these two log messages may be separated by other log messages.
 How about add a "\n" in this message and use one call?

> Can you suggest an alternate mechanism for (automated) testing of the changes other than
visual inspection of the logs? 

I think you might be able to use mockito to test it.  Not very sure.

> "Not enough xcievers" error should propagate to client
> ------------------------------------------------------
>
>                 Key: HDFS-1787
>                 URL: https://issues.apache.org/jira/browse/HDFS-1787
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Jonathan Hsieh
>              Labels: newbie
>             Fix For: 0.23.0
>
>         Attachments: hdfs-1787.2.patch, hdfs-1787.3.patch, hdfs-1787.3.patch, hdfs-1787.5.patch,
hdfs-1787.patch
>
>
> We find that users often run into the default transceiver limits in the DN. Putting aside
the inherent issues with xceiver threads, it would be nice if the "xceiver limit exceeded"
error propagated to the client. Currently, clients simply see an EOFException which is hard
to interpret, and have to go slogging through DN logs to find the underlying issue.
> The data transfer protocol should be extended to either have a special error code for
"not enough xceivers" or should have some error code for generic errors with which a string
can be attached and propagated.

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