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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7228) Add an SSD policy into the default BlockStoragePolicySuite
Date Mon, 13 Oct 2014 21:18:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14169994#comment-14169994
] 

Suresh Srinivas commented on HDFS-7228:
---------------------------------------

[~jingzhao], is this policy placing all the replicas in SSD? Instead of that, should we place
only one replica in SSD and the remaining in default storage? This may be better given SSD
is more expensive than disk and may not be as abundant as disk? Applications can place their
computation tasks closer to SSD replica (which is possible given block location now includes
storage type).

> Add an SSD policy into the default BlockStoragePolicySuite
> ----------------------------------------------------------
>
>                 Key: HDFS-7228
>                 URL: https://issues.apache.org/jira/browse/HDFS-7228
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 2.6.0
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: HDFS-7228.000.patch
>
>
> Currently in the default BlockStoragePolicySuite, we've defined 4 storage policies: LAZY_PERSIST,
HOT, WARM, and COLD. Since we have already defined the SSD storage type, it will be useful
to also include a SSD related storage policy in the default suite.



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