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https://issues.apache.org/jira/browse/HADOOP-12185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14614434#comment-14614434
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Inigo Goiri commented on HADOOP-12185:
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Correcting myself here: we cannot do a Map based on indeces because we would
have to update them when removing nodes and this gets expensive.
> NetworkTopology is not efficient adding/getting/removing nodes
> --------------------------------------------------------------
>
> Key: HADOOP-12185
> URL: https://issues.apache.org/jira/browse/HADOOP-12185
> Project: Hadoop Common
> Issue Type: Improvement
> Affects Versions: 2.7.0
> Reporter: Inigo Goiri
> Assignee: Inigo Goiri
> Attachments: HADOOP-12185-1.patch
>
>
> NetworkToplogy uses nodes with a list of children. The access to these
> children is slow as it's a linear search.
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