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https://issues.apache.org/jira/browse/HADOOP-3448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12600704#action_12600704
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Steve Loughran commented on HADOOP-3448:
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Its probably because the .class files dont even track where constants came
from. Change a constant: do a clean build.
Perhaps we should change the assert to say this.
> 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: dfs
> 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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