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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2832) Enable support for heterogeneous storages in HDFS
Date Fri, 15 Nov 2013 23:57:26 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13824253#comment-13824253
] 

Arpit Agarwal commented on HDFS-2832:
-------------------------------------

{quote}
 My point though is about the deterministic nature of pseudo random sequences.  In the sense
that if you initiate two independent PRNGs with the same seed, they will generate exactly
the same sequences.
{quote}
Seed collision is even less likely than outright UUID collision. The seed space for SHA1PRNG
is 2^160.

> 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, 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
>
>
> 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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