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https://issues.apache.org/jira/browse/HADOOP-1155?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hairong Kuang updated HADOOP-1155:
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Attachment: rackMap.patch
This patch is intended for review. It depends on HADOOP-1073 and collides with
HADOOP-988. I will resubmit one after both are resolved.
Besides the changes I suggested in the jira description, I modified the method
in ReplicationTargetChooser "private DatanodeDescriptor[] chooseRandom(int
numOfReplicas, String nodes, List<DatanodeDescriptor> excludedNodes)" to
return a list.
> Additional performance improvement to chooseTarget
> --------------------------------------------------
>
> Key: HADOOP-1155
> URL: https://issues.apache.org/jira/browse/HADOOP-1155
> 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: rackMap.patch
>
>
> A few additional thoughts to improve the performance of chooseTarget:
> 1. Reduce the # of calls to getDistance in sortedByDistance
> 2. Improve the performance of getNode by adding a rack name to rack node map
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