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https://issues.apache.org/jira/browse/HADOOP-14369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16023338#comment-16023338
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Xiao Chen commented on HADOOP-14369:
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Good catch [~elgoiri], thanks for the fix. Also thanks Andrew for the
review+commit.
> NetworkTopology calls expensive toString() when logging
> -------------------------------------------------------
>
> Key: HADOOP-14369
> URL: https://issues.apache.org/jira/browse/HADOOP-14369
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Inigo Goiri
> Assignee: Inigo Goiri
> Fix For: 2.9.0, 3.0.0-alpha3, 2.8.2
>
> Attachments: HADOOP-14369-000.patch, HADOOP-14369-001.patch
>
>
> When {{NetworkTopology}} calls {{add()}} or {{remove()}}, it calls
> {{toString()}} for {{LOG.debug()}} which is pretty expensive.
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