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https://issues.apache.org/jira/browse/HDFS-9810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15149232#comment-15149232
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Zhe Zhang commented on HDFS-9810:
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[~chris.douglas] / [~virajith] I had a similar confusion when seeing this JIRA
come up. Then I realized it's part of the HDFS-9806 work.
Given the scope of HDFS-9806 it will most likely need a feature branch. To
couple with that, maybe we should make HDFS-9806 an umbrella JIRA and convert
this series of JIRAs as subtasks?
> Allow support for more than one block replica per datanode
> ----------------------------------------------------------
>
> Key: HDFS-9810
> URL: https://issues.apache.org/jira/browse/HDFS-9810
> Project: Hadoop HDFS
> Issue Type: Task
> Components: datanode
> Reporter: Virajith Jalaparti
>
> Datanodes report and store only one replica of each block. It should be
> possible to store multiple replicas among its different configured storage
> types, particularly to support non-durable media and remote storage.
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