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https://issues.apache.org/jira/browse/HDFS-2832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13760509#comment-13760509
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Arpit Agarwal commented on HDFS-2832:
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Thanks for the feedback Eric. Both of these would be good to have and came up
during design discussions but we have not addressed either.
For #2, in addition to your points there are other locations where storage
directories are assumed to be File-addressable. I am not sure of the amount of
work involved here.
Multiple replicas per Datanode looks easier and can be done on top of the
Heterogeneous Storage work. We would need phase 1 of the feature to support
multiple storages.
> Enable support for heterogeneous storages in HDFS
> -------------------------------------------------
>
> Key: HDFS-2832
> URL: https://issues.apache.org/jira/browse/HDFS-2832
> Project: Hadoop HDFS
> Issue Type: New Feature
> Affects Versions: 0.24.0
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
> Attachments: 20130813-HeterogeneousStorage.pdf
>
>
> HDFS currently supports configuration where storages are a list of
> directories. Typically each of these directories correspond to a volume with
> its own file system. All these directories are homogeneous and therefore
> identified as a single storage at the namenode. I propose, change to the
> current model where Datanode * is a * storage, to Datanode * is a collection
> * of strorages.
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