[jira] Commented: (HADOOP-3448) Add some more hints of the problem when datanode and namenode don't match

["Steve Loughran (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-3448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12600182#action_12600182 ] 

Steve Loughran commented on HADOOP-3448:
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The patch I've submitted adds the version information, so the the stack trace can be more useful than :

java.lang.AssertionError: Data-node and name-node layout versions must be the same.,

However, one thing to consider is whether this should be checked every time the datanode starts up, rather than skipping it if -ea is disabled. Otherwise there is a risk that the problem will not be picked up in production. 


> Add some more hints of the problem when datanode and namenode don't match
> -------------------------------------------------------------------------
>
>                 Key: HADOOP-3448
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3448
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: documentation
>    Affects Versions: 0.18.0
>            Reporter: Steve Loughran
>            Priority: Minor
>         Attachments: hadoop-3448.patch
>
>   Original Estimate: 0.08h
>  Remaining Estimate: 0.08h
>
> When there is a mismatch between name and data mode, and you are running with -ea set, then Datanode.handshake() bails out with an assertion  "Data-node and name-node layout versions must be the same.";
> However, this message doesnt actually say which version numbers are at fault. A better error message would include the version information, so pointing the finger of blame would be easier.

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