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https://issues.apache.org/jira/browse/HADOOP-1256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12488742
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Doug Cutting commented on HADOOP-1256:
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The benefits of new features should be evaluated differently than those of
performance optimizations. Both should be weighed against their added
complexity, but the improvements offered by optimizations can and should be
quantitatively measured before they're committed. Optimizing things by eye is
known to be error-prone. Evaluating features is more subjective.
So, +1 for requiring benchmark results for optimizations.
> Dfs image loading and edits loading creates multiple instances of
> DatanodeDescriptor for the same datanode
> ----------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-1256
> URL: https://issues.apache.org/jira/browse/HADOOP-1256
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.3
> Reporter: Hairong Kuang
> Assigned To: Hairong Kuang
> Fix For: 0.13.0
>
> Attachments: nodeMap.patch
>
>
> This leads to multiple instances of DatanodeDescriptors for the same datanode
> stored in Host2DatanodeMap.
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