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https://issues.apache.org/jira/browse/HDFS-2832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13841935#comment-13841935
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Suresh Srinivas commented on HDFS-2832:
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bq. Hi folks, sorry for just now looping back to this JIRA.
Is this not too late to loop back now, after design published and work started
many months ago? Doing this after the merge vote is called (with 3 days to wrap
up the voting) seems like a strange choice of timing to me. As regards to
client APIs, we can certainly discuss them post phase 1 merge and when the work
starts on phase 2 in relevant jiras.
Hopefully [~arpitagarwal] can provide answers to the technical questions.
> 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,
> 20131125-HeterogeneousStorage-TestPlan.pdf,
> 20131125-HeterogeneousStorage.pdf,
> 20131202-HeterogeneousStorage-TestPlan.pdf,
> 20131203-HeterogeneousStorage-TestPlan.pdf, H2832_20131107.patch,
> editsStored, h2832_20131023.patch, h2832_20131023b.patch,
> h2832_20131025.patch, h2832_20131028.patch, h2832_20131028b.patch,
> h2832_20131029.patch, h2832_20131103.patch, h2832_20131104.patch,
> h2832_20131105.patch, h2832_20131107b.patch, h2832_20131108.patch,
> h2832_20131110.patch, h2832_20131110b.patch, h2832_20131111.patch,
> h2832_20131112.patch, h2832_20131112b.patch, h2832_20131114.patch,
> h2832_20131118.patch, h2832_20131119.patch, h2832_20131119b.patch,
> h2832_20131121.patch, h2832_20131122.patch, h2832_20131122b.patch,
> h2832_20131123.patch, h2832_20131124.patch, h2832_20131202.patch,
> h2832_20131203.patch
>
>
> 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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