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https://issues.apache.org/jira/browse/SOLR-15209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17416811#comment-17416811
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Ilan Ginzburg commented on SOLR-15209:
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How about your proposal [I rephrased in the dev
list|https://www.mail-archive.com/[email protected]/msg00223.html] (based on
your [slack
post|https://the-asf.slack.com/archives/CEKUCUNE9/p1619692977151000]).
Copying it here:
* Add support for a new {{solr.xml}} config called something like
{{forceDefaultLegacyPlacementStrategy}}
* Do not add anything in {{solr.xml}}
At runtime:
* If a placement plugin is explicitly configured (existing plugin config in
ZK), use it,
* If {{forceDefaultLegacyPlacementStrategy}} is defined in solr.xml, use
{{LEGACY}}
* (else) If {{forceDefaultLegacyPlacementStrategy}} is not defined in
{{solr.xml}}, use {{AffinityPlacementFactory}}
Both [~ab] and I said we like this proposal back then, but we didn't conclude
anything. That's the approach I like the most.
> Make the AffinityPlacementFactory the default placement plugin
> --------------------------------------------------------------
>
> Key: SOLR-15209
> URL: https://issues.apache.org/jira/browse/SOLR-15209
> Project: Solr
> Issue Type: Improvement
> Reporter: Andrzej Bialecki
> Assignee: Ilan Ginzburg
> Priority: Major
>
> 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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