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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4894) Multiple Replica Placement Policies support in one HDFS cluster
Date Fri, 11 Oct 2013 03:14:43 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13792294#comment-13792294
] 

Junping Du commented on HDFS-4894:
----------------------------------

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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