[jira] [Updated] (HDDS-3079) Extract Rack Specific code from Container and Pipeline placement policies into a common parent

["Stephen O'Donnell (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDDS-3079?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stephen O'Donnell updated HDDS-3079:
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    Summary: Extract Rack Specific code from Container and Pipeline placement policies into a common parent  (was: Consider merging PipelinePlacementPolicy and SCMContainerPlacementPolicyRackAware)

> Extract Rack Specific code from Container and Pipeline placement policies into a common parent
> ----------------------------------------------------------------------------------------------
>
>                 Key: HDDS-3079
>                 URL: https://issues.apache.org/jira/browse/HDDS-3079
>             Project: Hadoop Distributed Data Store
>          Issue Type: Sub-task
>    Affects Versions: 0.6.0
>            Reporter: Stephen O'Donnell
>            Priority: Major
>
> The Ratis pipeline provider uses a class PipelinePlacementPolicy to selection datanodes for new pipelines in a rack aware fashion. This class also considers server load when selecting hosts and in the future, it may have more features.
> However, SCMContainerPlacementPolicyRackAware implements very similar rack aware node choosing logic and is used by the replication manager.
> It is possible these two implementations could diverge and it also means we have two places to make changes if there are any improvements made.
> It would be worth investigating if at least the rack aware node choosing logic can be shared between these two classes, or even better the same class can be used for both.



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