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https://issues.apache.org/jira/browse/SOLR-17288?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley updated SOLR-17288:
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Description:
I'd like to have the preferredLeader replica property be assigned automatically
by Solr (if configured to). It would be applied when replicas are created for
a new shard, like collection creation and restoring a collection from a backup.
Shard split is maybe different.
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.
was:
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.
> 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
> Priority: Major
>
> I'd like to have the preferredLeader replica property be assigned
> automatically by Solr (if configured to). It would be applied when replicas
> are created for a new shard, like collection creation and restoring a
> collection from a backup. Shard split is maybe different.
> 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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