zkendall commented on code in PR #2686:
URL: https://github.com/apache/lucene-solr/pull/2686#discussion_r1799751372
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solr/core/src/java/org/apache/solr/update/SolrIndexSplitter.java:
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@@ -130,9 +131,26 @@ public SolrIndexSplitter(SplitIndexCommand cmd) {
}
routeFieldName = cmd.routeFieldName;
if (routeFieldName == null) {
- field = searcher.getSchema().getUniqueKeyField();
+ // To support routing child documents, use the root field if it exists
(which would be populated with unique field),
+ // otherwise use the unique key field
+ field = searcher.getSchema().getFieldOrNull(IndexSchema.ROOT_FIELD_NAME);
+ if(field == null) {
+ field = searcher.getSchema().getUniqueKeyField();
+ }
} else {
- field = searcher.getSchema().getField(routeFieldName);
+ SchemaField uniqueField = searcher.getSchema().getUniqueKeyField();
+ if (uniqueField.getName().equals(routeFieldName)) {
+ // Explicitly routing based on unique field
+ // To support routing child documents, use the root field if it exists
(which would be populated with unique field),
+ // otherwise use the unique key field
+ field =
searcher.getSchema().getFieldOrNull(IndexSchema.ROOT_FIELD_NAME);
+ if (field == null) {
+ field = searcher.getSchema().getUniqueKeyField();
+ }
+ } else {
+ // Custom routing
+ field = searcher.getSchema().getField(routeFieldName);
+ }
Review Comment:
It kinda seems like the opposite. The routeFieldName seems to be
pre-populated by the zk collection state (not from split caller (api doesn't
support setting afaict)). Doesn't that mean it'll usually be set?
https://github.com/apache/lucene-solr/blob/2d63a9d1208bbf950135b90496268b0a40e119b5/solr/core/src/java/org/apache/solr/handler/admin/SplitOp.java#L118-L135
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