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https://issues.apache.org/jira/browse/HDDS-7265?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Neil Joshi updated HDDS-7265:
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Status: Patch Available (was: In Progress)
https://github.com/apache/ozone/pull/4002
> ScatterRackPolicy for Ratis pipeline provider container placement
> ------------------------------------------------------------------
>
> Key: HDDS-7265
> URL: https://issues.apache.org/jira/browse/HDDS-7265
> Project: Apache Ozone
> Issue Type: Improvement
> Reporter: Neil Joshi
> Assignee: Neil Joshi
> Priority: Major
> Labels: pull-request-available
>
> We expected container placement for ratis containers under the
> SCMContainerPlacementRackScatter to behave as documented for EC. -Instead,
> we find when we configure ozone to use the SCMContainerPlacementRackScatter
> for ratis container placement, the placement behaves like the
> SCMContainerPlacementRackAware.-
> That is, for a cluster with 3 racks and Datanodes on each of the racks, with
> a RATIS 3 configuration, to have pipelines and containers placed on each of
> the 3 racks. -Instead we find that pipelines and containers are placed like
> SCMContainerPlacementRackAware with 2 on one rack and 1 on another rack.-
>
> Design for providing a ScatterRack pipelinePlacementPolicy for the pipeline
> provider on open containers, RatisPipelineProvider.
> Proposed in this design document is to provide an additional
> PipelinePlacementPolicy that prioritizes container fault tolerance ensuring
> whenever possible each pipeline is on a separate rack. see
> [https://docs.google.com/document/d/1npEseOoRzaNJIwFq7di4tWhb5o8LpUFYifU30kopd8g/edit?usp=sharing]
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