David Smiley created SOLR-17288:
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Summary: automatic preferredLeader
Key: SOLR-17288
URL: https://issues.apache.org/jira/browse/SOLR-17288
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Components: SolrCloud
Reporter: David Smiley
I'd like to have the preferredLeader replica property be assigned automatically
by Solr (if configured to).
I propose that a
[ReplicaPlacement|https://github.com/apache/solr/blob/branch_9_6/solr/core/src/java/org/apache/solr/cluster/placement/ReplicaPlacement.java#L35]
decision, computed by a PlacementPlugin, include a "preferredLeader" boolean.
Alternatively, we could alter PlacementPlugin.computePlacements method contract
to further state that the returned order is significant -- that replicas are
created in iteration order. Furthermore, the consumer (in Assign) would mark
the first replica as preferredLeader.
A default algorithm could simply choose a preferredLeader at random.
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