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https://issues.apache.org/jira/browse/HDDS-16204?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chung-En Lee resolved HDDS-16204.
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Resolution: Fixed
> Avoid the per-group list copy in ContainerToKeyMapping.getContainers
> --------------------------------------------------------------------
>
> Key: HDDS-16204
> URL: https://issues.apache.org/jira/browse/HDDS-16204
> Project: Apache Ozone
> Issue Type: Sub-task
> Reporter: Meng-Shuan Tsai
> Assignee: Meng-Shuan Tsai
> Priority: Major
> Labels: pull-request-available
>
> {{ContainerToKeyMapping.getContainers}} ({{ozone debug om
> container-key-mapping}}) only checks whether a key's blocks fall in the
> requested container IDs, but it calls
> {{OmKeyLocationInfoGroup.getLocationList()}} for every version group. That
> accessor is documented as not O(1); it flatten-copies into a new List.
> {{getLocationLists()}} returns {{locationVersionMap.values()}} with no copy.
> The method does not keep the flattened list; it adds matching container IDs
> to a HashSet. Iterate {{getLocationLists()}} instead. Behavior unchanged.
> Related: HDDS-16183.
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