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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