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Posted to issues@solr.apache.org by "Houston Putman (Jira)" <ji...@apache.org> on 2022/01/14 18:04:00 UTC
[jira] [Updated] (SOLR-15209) Make the LegacyAssignStrategy the SimplePlacementFactory
[ https://issues.apache.org/jira/browse/SOLR-15209?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Houston Putman updated SOLR-15209:
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Summary: Make the LegacyAssignStrategy the SimplePlacementFactory (was: Make the AffinityPlacementFactory the default placement plugin)
> Make the LegacyAssignStrategy the SimplePlacementFactory
> --------------------------------------------------------
>
> 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 10m
> 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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