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https://issues.apache.org/jira/browse/HADOOP-7030?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Angeles updated HADOOP-7030:
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Attachment: HADOOP-7030-2.patch
Updated patch that introduces the RefreshableDNSToSwitchMapping interface which
adds a 'refresh' method to DNSToSwitchMapping. This can be used later as a hook
for 'hadoop (dfs|mr)admin -refreshNodes' to update the topology without
restarting the cluster.
> new topology mapping implementations
> ------------------------------------
>
> Key: HADOOP-7030
> URL: https://issues.apache.org/jira/browse/HADOOP-7030
> Project: Hadoop Common
> Issue Type: New Feature
> Affects Versions: 0.20.1, 0.20.2, 0.21.0
> Reporter: Patrick Angeles
> Attachments: HADOOP-7030-2.patch, HADOOP-7030.patch, topology.patch
>
>
> The default ScriptBasedMapping implementation of DNSToSwitchMapping for
> determining cluster topology has some drawbacks. Principally, it forks to an
> OS-specific script.
> This issue proposes two new Java implementations of DNSToSwitchMapping.
> TableMapping reads a two column text file that maps an IP or hostname to a
> rack ID. Ip4RangeMapping reads a three column text file where each line
> represents a start and end IP range plus a rack ID.
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