[jira] [Created] (HDDS-3079) Consider merging PipelinePlacementPolicy and SCMContainerPlacementPolicyRackAware

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

Stephen O'Donnell created HDDS-3079:
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             Summary: Consider merging PipelinePlacementPolicy and SCMContainerPlacementPolicyRackAware
                 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


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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