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https://issues.apache.org/jira/browse/HDFS-870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12838583#action_12838583
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Koji Noguchi commented on HDFS-870:
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If we're going to add this, please make it optional.
Without HADOOP:5059, Namenode would hang 2-3 seconds for each expired/new
datanode when it calls topology script in our environment.
(or you can use java topology code)
It's ok at start up time since heap is relatively small and namenode is usually
not out of the safemode.
> Topology is permanently cached
> ------------------------------
>
> Key: HDFS-870
> URL: https://issues.apache.org/jira/browse/HDFS-870
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Allen Wittenauer
>
> Replacing the topology script requires a namenode bounce because the NN
> caches the information permanently. It should really either expire it
> periodically or expire on -refreshNodes.
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