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https://issues.apache.org/jira/browse/HDFS-16219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17416534#comment-17416534
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Akira Ajisaka commented on HDFS-16219:
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I suppose the default value seems 10 and 10 in federation balance.
https://github.com/apache/hadoop/blob/77299ae992b16066dd61e4fec9ff63b863ae2e21/hadoop-tools/hadoop-federation-balance/src/site/markdown/HDFSFederationBalance.md

> RBF: Set default map tasks and bandwidth in RouterFederationRename
> ------------------------------------------------------------------
>
>                 Key: HDFS-16219
>                 URL: https://issues.apache.org/jira/browse/HDFS-16219
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: rbf
>         Environment: Hadoop 3.3.0 with patches
>            Reporter: Akira Ajisaka
>            Assignee: Viraj Jasani
>            Priority: Major
>
> If dfs.federation.router.federation.rename.map or 
> dfs.federation.router.federation.rename.bandwidth is not set, DFSRouter fails 
> to launch.
> This issue is similar to HDFS-16217.



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