[jira] [Created] (SOLR-15209) Make the AffinityPlacementFactory the default placement plugin

["Andrzej Bialecki (Jira)" <ji...@apache.org>]

Andrzej Bialecki created SOLR-15209:
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             Summary: Make the AffinityPlacementFactory the default placement plugin
                 Key: SOLR-15209
                 URL: https://issues.apache.org/jira/browse/SOLR-15209
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: Andrzej Bialecki


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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