tflobbe commented on a change in pull request #677: SOLR-13257: support for
stable replica routing preferences
URL: https://github.com/apache/lucene-solr/pull/677#discussion_r303695087
##########
File path:
solr/core/src/java/org/apache/solr/handler/component/HttpShardHandlerFactory.java
##########
@@ -449,9 +556,83 @@ private static boolean hasReplicaType(Object o, String
preferred) {
}
}
+ private final ReplicaListTransformerFactory randomRltFactory = (String
configSpec, SolrQueryRequest request,
+ ReplicaListTransformerFactory fallback) ->
shufflingReplicaListTransformer;
+ private ReplicaListTransformerFactory stableRltFactory;
+ private ReplicaListTransformerFactory defaultRltFactory;
+
+ /**
+ * Private class responsible for applying pairwise sort based on inherent
replica attributes,
+ * and subsequently reordering any equivalent replica sets according to
behavior specified
+ * by the baseReplicaListTransformer.
+ */
+ private static final class TopLevelReplicaListTransformer implements
ReplicaListTransformer {
+
+ private final NodePreferenceRulesComparator replicaComp;
+ private final ReplicaListTransformer baseReplicaListTransformer;
+
+ public TopLevelReplicaListTransformer(NodePreferenceRulesComparator
replicaComp, ReplicaListTransformer baseReplicaListTransformer) {
+ this.replicaComp = replicaComp;
+ this.baseReplicaListTransformer = baseReplicaListTransformer;
+ }
+
+ @Override
+ public void transform(List<?> choices) {
Review comment:
Ah, right, because the affinity just sets the rotation. But does it have to
be? What's the difference between doing a rotations vs a shuffle with a seed?
like:
`Collections.shuffle(replicas, new Random(hashValue));`
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