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