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https://issues.apache.org/jira/browse/HDDS-5804?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aravindan Vijayan resolved HDDS-5804.
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Fix Version/s: 1.3.0
Resolution: Fixed
Merged Github PR.
> SCMContainerPlacementCapacity is working incorrectly
> ----------------------------------------------------
>
> Key: HDDS-5804
> URL: https://issues.apache.org/jira/browse/HDDS-5804
> Project: Apache Ozone
> Issue Type: Bug
> Components: SCM
> Affects Versions: 1.2.0
> Reporter: Aravindan Vijayan
> Assignee: Aswin Shakil Balasubramanian
> Priority: Critical
> Labels: pull-request-available
> Fix For: 1.3.0
>
>
> From the Javadoc of the class
> {code}
> * Container placement policy that randomly choose datanodes with remaining
> * space to satisfy the size constraints.
> * <p>
> * The Algorithm is as follows, Pick 2 random nodes from a given pool of nodes
> * and then pick the node which lower utilization. This leads to a higher
> * probability of nodes with lower utilization to be picked.
> * <p>
> {code}
> In SCMContainerPlacementCapacity#chooseNode, we choose the node with a higher
> utilization % (scmUsed / capacity). This is used by the replication manager
> to pick a node to replicate an under-replicated container to. This means that
> if configured, this policy will pick the more used nodes, thereby creating
> the opposite effect.
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