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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1256) Dfs image loading and edits loading creates multiple instances of DatanodeDescriptor for the same datanode
Date Fri, 13 Apr 2007 18:32:15 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12488742
] 

Doug Cutting commented on HADOOP-1256:
--------------------------------------

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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