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https://issues.apache.org/jira/browse/HDFS-4894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13792294#comment-13792294
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Junping Du commented on HDFS-4894:
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One interesting feature in Google's Spanner is that application can specify
replica placement to meet its requirement on efficiency/reliability. In HDFS,
one way to achieve this is to support multiple BlockPlacementPolicy (BPPs) and
writer can specify it like replica ratio today.
> Multiple Replica Placement Policies support in one HDFS cluster
> ---------------------------------------------------------------
>
> Key: HDFS-4894
> URL: https://issues.apache.org/jira/browse/HDFS-4894
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Junping Du
> Labels: BlockPlacementPolicy
>
> We should allow multiple BPPs co-existing on the same HDFS cluster for
> different purpose of data and different types of application, i.e. we should
> allow some old, infrequently accessed data/directory to under RAID policy so
> that can save space.
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