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https://issues.apache.org/jira/browse/HDFS-6685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14081762#comment-14081762
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Arpit Agarwal commented on HDFS-6685:
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+1 for the latest patch.
> Balancer should preserve storage type of replicas
> -------------------------------------------------
>
> Key: HDFS-6685
> URL: https://issues.apache.org/jira/browse/HDFS-6685
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: balancer
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Tsz Wo Nicholas Sze
> Attachments: h6685_20140728.patch, h6685_20140729.patch,
> h6685_20140730.patch, h6685_20140730b.patch, h6685_20140731.patch
>
>
> When Balancer moves replicas to balance the cluster, it should always move
> replicas from a storage with any type to another storage with the same type,
> i.e. it preserves storage type of replicas. It does not make sense to move
> replicas to a different storage type.
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