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https://issues.apache.org/jira/browse/HDDS-7544?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Attila Doroszlai resolved HDDS-7544.
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Fix Version/s: 2.2.0
Resolution: Fixed
HDDS-12828 improved ContainerStateManager and related data structures, so the
description no longer applies.
In this task ContainerEntry was changed to support read-heavy workload as
[suggested|https://github.com/apache/ozone/pull/8990#issuecomment-3241942511]
by [~sodonnell] in the review.
> ContainerStateMap uses HashSet to store container replica lists
> ---------------------------------------------------------------
>
> Key: HDDS-7544
> URL: https://issues.apache.org/jira/browse/HDDS-7544
> Project: Apache Ozone
> Issue Type: Sub-task
> Reporter: Duong
> Assignee: Neo Chien
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.2.0
>
>
> ContainerStateMap uses HashSets to store container replica lists,
> [link|https://github.com/apache/ozone/blob/master/hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/container/states/ContainerStateMap.java#L91-L91].
> Each HashSet instance is backed by a HashMap whose default size is 16. This
> set stores 3 replica references at max.
> So, for each container, a buffer of at least 13 * 8 ~ 108 bytes is never used.
>
> Using Set for container replica is not mandatory for the logic of
> ContainerStateMap, a replacement of LinkedList would offer the same without
> indicating waste buffer.
>
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