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https://issues.apache.org/jira/browse/HDFS-6685?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo Nicholas Sze updated HDFS-6685:
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Description: 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. (was: In order to maintain
storage policy requirement, Balancer always moves replicas from a storage with
any type to another storage with the same type, i.e. it preserves storage type
of replicas. In this way, Balancer does not require to know storage policy
information.)
Summary: Balancer should preserve storage type of replicas (was:
Archival Storage: Update Balancer to preserve storage type of replicas)
Revised the summary and description.
> 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
>
>
> 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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