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https://issues.apache.org/jira/browse/HDFS-16009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17340125#comment-17340125
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JiangHua Zhu commented on HDFS-16009:
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Wei-Chiu Chuang, Kihwal Lee, do you have some good suggestions.
> HDFS tiered storage support
> ---------------------------
>
> Key: HDFS-16009
> URL: https://issues.apache.org/jira/browse/HDFS-16009
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: JiangHua Zhu
> Priority: Major
>
> HDFS currently stores data blocks on different data nodes. These data nodes
> are random within the scope of the network topology (local rack/different
> racks/node group).
> When the NameNode allocates DataNodes to the Block, it is randomly selected,
> that is, each DataNode is selected equally.
> We should make a hierarchical strategy. For example, DataNode1, DataNode2,
> and DataNode3 are the same level, and DataNode4 and DataNode5 are the same
> level. Because the hardware between DataNodes may be different, in this case,
> it is necessary for us to do tiered storage, so that DataNodes with poor
> hardware can store up to 50%, and 40% or even lower. This is conducive to
> cluster maintenance and stability.
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