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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1787) "Not enough xcievers" error should propagate to client
Date Wed, 18 May 2011 23:02:48 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13035830#comment-13035830
] 

Todd Lipcon commented on HDFS-1787:
-----------------------------------

I haven't looked at the patch in detail yet either :) Just saying that we shouldn't consider
protocol breaks incompatible since they're pretty much guaranteed between versions (eg federation
added blockPool IDs which broke every protocol in HDFS)

> "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.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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