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https://issues.apache.org/jira/browse/HDFS-2832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13739734#comment-13739734
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John George commented on HDFS-2832:
-----------------------------------
< To support Storage Types, each DataNode must be treated as a collection of
storages. (excerpt from pdf)
Consider a cluster with a set of DataNodes with high end hardware (eg: SSD),
and another set of DataNodes with low end hardware (eg: HDD). Each datanode is
homogenous by itself, but the cluster itself is heterogeneous. Can the user
still specify storage preference using StorageType and get expected results?
> 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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