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https://issues.apache.org/jira/browse/SOLR-15209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17475811#comment-17475811
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ASF subversion and git services commented on SOLR-15209:
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Commit d5b99086daf1d2ad406ea98e97814d8dcc2e4c46 in solr's branch
refs/heads/main from Houston Putman
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=d5b9908 ]
SOLR-15209: Make the LegacyAssignStrategy the LegacyPlacementPlugin (#512)
> Make the AffinityPlacementFactory the default placement plugin
> --------------------------------------------------------------
>
> Key: SOLR-15209
> URL: https://issues.apache.org/jira/browse/SOLR-15209
> Project: Solr
> Issue Type: Improvement
> Affects Versions: 9.0
> Reporter: Andrzej Bialecki
> Assignee: Ilan Ginzburg
> Priority: Blocker
> Fix For: 9.0
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> Currently there's a lot of code in {{Assign}} dealing with the fact that we
> still support the old "legacy" replica assignment as well as the new
> plugin-based placement strategies.
> Furthermore, the "legacy" assignment is now the default even though it's
> neither robust nor optimal, except in the very simple and small clusters.
> Also, providing another plugin-based placement as the default impl. runs into
> a small complication - in the absence of any plugin config the code reverts
> to the "legacy".
> In order to promote the adoption of the new plugin-based placements we should
> make the {{AffinityPlacementFactory}} the new default placement strategy,
> selected when the explicit configuration is missing (and then create it as a
> default configuration in {{PlacementPluginFactoryLoader}}).
> I propose to re-package the "legacy" strategy as a {{PlacementPluginFactory}}
> so that it can be configured in the same way as other placement plugins.
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