Github user dragonsinth commented on a diff in the pull request: https://github.com/apache/lucene-solr/pull/32#discussion_r61507382 --- Diff: solr/solrj/src/java/org/apache/solr/common/cloud/ZkStateReader.java --- @@ -484,6 +498,12 @@ private void refreshLegacyClusterState(Watcher watcher) } this.legacyCollectionStates = loadedData.getCollectionStates(); this.legacyClusterStateVersion = stat.getVersion(); + for (Map.Entry<String, ClusterState.CollectionRef> entry : this.legacyCollectionStates.entrySet()) { + if (entry.getValue().isLazilyLoaded() == false) { + // a watched collection - trigger notifications + notifyStateWatchers(entry.getKey(), entry.getValue().get()); + } + } --- End diff -- I think it would add a lot of value here to actually check differences. There really wouldn't be much computational work since you could restrict it to watched collections. Something like: ``` for (Map.Entry<String, CollectionWatch> watchEntry : this.collectionWatches.entrySet()) { String coll = watchEntry.getKey(); CollectionWatch collWatch = watchEntry.getValue(); DocCollection newState = this.legacyCollectionStates.get(coll).get(); if (!collWatch.stateWatchers.isEmpty() && !Objects.equals(oldCollectionStates.get(coll).get(), newState)) { notifyStateWatchers(coll, newState); } } ```
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