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https://issues.apache.org/jira/browse/HDFS-10467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15403257#comment-15403257
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Inigo Goiri commented on HDFS-10467:
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Regarding the rebalancing operations, currently we are proposing to disallow
write accesses from the Routers. The problem is that then we have to disallow
direct accesses to the Namenodes to prevent writes at that level. For this
reason, we could leverage the concept of immutable folders/files from HDFS-3154
and more recently HDFS-7568. Not sure how likely are those efforts are to move
forward though.
> Router-based HDFS federation
> ----------------------------
>
> Key: HDFS-10467
> URL: https://issues.apache.org/jira/browse/HDFS-10467
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: fs
> Affects Versions: 2.7.2
> Reporter: Inigo Goiri
> Assignee: Inigo Goiri
> Attachments: HDFS Router Federation.pdf, HDFS-10467.PoC.001.patch,
> HDFS-10467.PoC.patch, HDFS-Router-Federation-Prototype.patch
>
>
> Add a Router to provide a federated view of multiple HDFS clusters.
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