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https://issues.apache.org/jira/browse/HDFS-11564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15939001#comment-15939001
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Anu Engineer commented on HDFS-11564:
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The algorithms of choosing 2 random nodes and then placing the container on the
lower utilization node is discussed in great depth in this survey paper.
https://pdfs.semanticscholar.org/3597/66cb47572028eb70c797115e987ff203e83f.pdf
> Ozone: SCM: Add Comparable Metric Support
> -----------------------------------------
>
> Key: HDFS-11564
> URL: https://issues.apache.org/jira/browse/HDFS-11564
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
> Affects Versions: HDFS-7240
> Reporter: Anu Engineer
> Assignee: Anu Engineer
>
> While picking the datanode or the pool to place a container, SCM needs to be
> able to compare pools and datanodes. This jira proposes to add a Comparable
> Metric interface from which DatanodeCapacity and DatanodeIOLoad metrics can
> be derived. This will also convert SCM Container Placement Capacity policy to
> use these metrics.
> Adding these metrics makes all placement policy operate on the basis of these
> metrics and it makes it easy to simulate cluster imbalances as well as reason
> about code. All new SCM metrics which have the property of total ordering
> should be derived from this interface.
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