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https://issues.apache.org/jira/browse/HDDS-2591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16978910#comment-16978910
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Bharat Viswanadham commented on HDDS-2591:
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Hi [~adoroszlai]
This API is used so that it can be used by Scanners. I think, for now, we can
leave it, and fix the issue reported.
> No tailMap needed for startIndex 0 in ContainerSet#listContainer
> ----------------------------------------------------------------
>
> Key: HDDS-2591
> URL: https://issues.apache.org/jira/browse/HDDS-2591
> Project: Hadoop Distributed Data Store
> Issue Type: Improvement
> Components: Ozone Datanode
> Reporter: Attila Doroszlai
> Assignee: Attila Doroszlai
> Priority: Minor
>
> {{ContainerSet#listContainer}} has this code:
> {code:title=https://github.com/apache/hadoop-ozone/blob/3c334f6a7b344e0e5f52fec95071c369286cfdcb/hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/impl/ContainerSet.java#L198}
> map = containerMap.tailMap(containerMap.firstKey(), true);
> {code}
> This is equivalent to:
> {code}
> map = containerMap;
> {code}
> since {{tailMap}} is a sub-map with all keys larger than or equal to
> ({{inclusive=true}}) {{firstKey}}, which is the lowest key in the map. So it
> is a sub-map with all keys, ie. the whole map.
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