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https://issues.apache.org/jira/browse/HDFS-11546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17217713#comment-17217713
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Íñigo Goiri commented on HDFS-11546:
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[~hexiaoqiao], there are multi destination policies that can be sequential for
retrying a read for example.
We don't know if the consistent hashing approach is enforced or not, so we
first try in the subcluster that it should be and if it is not, we try in the
following ones in order.
> Federation Router RPC server
> ----------------------------
>
> Key: HDFS-11546
> URL: https://issues.apache.org/jira/browse/HDFS-11546
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs
> Affects Versions: HDFS-10467
> Reporter: Íñigo Goiri
> Assignee: Íñigo Goiri
> Priority: Major
> Fix For: 2.9.0, 3.0.0
>
> Attachments: HDFS-11546-HDFS-10467-000.patch,
> HDFS-11546-HDFS-10467-001.patch, HDFS-11546-HDFS-10467-002.patch,
> HDFS-11546-HDFS-10467-003.patch, HDFS-11546-HDFS-10467-004.patch,
> HDFS-11546-HDFS-10467-005.patch, HDFS-11546-HDFS-10467-007.patch,
> HDFS-11546-HDFS-10467-008.patch, HDFS-11546-HDFS-10467-009.patch,
> HDFS-11546-HDFS-10467-010.patch, HDFS-11546-HDFS-10467-011.patch
>
>
> RPC server side of the Federation Router implements ClientProtocol.
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