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Posted to issues@ozone.apache.org by "Siddharth Wagle (Jira)" <ji...@apache.org> on 2020/06/04 19:55:00 UTC
[jira] [Updated] (HDDS-3079) Extract Rack Specific code from
Container and Pipeline placement policies into a common parent
[ https://issues.apache.org/jira/browse/HDDS-3079?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Siddharth Wagle updated HDDS-3079:
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Parent Issue: HDDS-3722 (was: HDDS-698)
> 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.
> Previous discussion indicated that we should not bring these two implementations into one, but it would be preferable to extract the common rack specific logic into a common parent in the inheritence chain.
> Aright now all placement policies inherit from SCMCommonPlacementPolicy, so it would make sense to have a new abstract class that extends Common, called SCMCommonRackAwarePolicy, and have the others inherit from it.
> Note that as part of this move, the rack specific logic in SCMCommonPlacementPolicy.validateContainerPlacement() should be extracted and moved into this common parent too.
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