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https://issues.apache.org/jira/browse/HADOOP-971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12486532
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Hadoop QA commented on HADOOP-971:
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+1, because
http://issues.apache.org/jira/secure/attachment/12354797/Host2NodesMap.patch
applied and successfully tested against trunk revision
http://svn.apache.org/repos/asf/lucene/hadoop/trunk/525290. Results are at
http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch
> DFS Scalabilty: Improve name node performance by adding a hostname to
> datanodes map
> -----------------------------------------------------------------------------------
>
> Key: HADOOP-971
> URL: https://issues.apache.org/jira/browse/HADOOP-971
> Project: Hadoop
> Issue Type: Improvement
> Components: dfs
> Affects Versions: 0.12.2
> Reporter: Hairong Kuang
> Assigned To: Hairong Kuang
> Fix For: 0.13.0
>
> Attachments: Host2NodesMap.patch
>
>
> A name node currently maintains a datanode map which maps a storage id to a
> dataNodeDescriptor. When the name node needs to get a datanodeDescriptor by
> its name (hostname:port#) or by its host name, it has to iterate through the
> data node set, which is very inefficent. I'd like to add an additional map
> that maps a host name to an array list of DatanodeDescriptors that contains
> all the data nodes running on the host. Since most of time a node runs only
> one data node, the intial size of the array list is set to be 1.
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