jmazanec15 commented on code in PR #12050:
URL: https://github.com/apache/lucene/pull/12050#discussion_r1062966074
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lucene/core/src/java/org/apache/lucene/util/hnsw/OnHeapHnswGraph.java:
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@@ -94,36 +93,83 @@ public int size() {
}
/**
- * Add node on the given level
+ * Add node on the given level. Nodes can be inserted out of order, but it
requires that the nodes
Review Comment:
> but still because in L156 we need to copy the rest of array again and
again as long as that is a non-appending action
Right, this could be expensive for out of order insertion. I can try
switching the nodeByLevel int array to a TreeSet and compare performance to
https://github.com/apache/lucene/issues/11354.
One complication with this approach is that the NodesIterator expects an int
array:
https://github.com/apache/lucene/blob/main/lucene/core/src/java/org/apache/lucene/util/hnsw/HnswGraph.java#L134.
Given this is a public interface, we might need to either convert the treeset
to an int array every time
[getNodesOnLevel](https://github.com/apache/lucene/blob/main/lucene/core/src/java/org/apache/lucene/util/hnsw/OnHeapHnswGraph.java#L165)
gets called, or alter the NodesIterator interface to support both an int array
and an Iterator produced from the TreeSet.
@zhaih What do you think of this approach? Is there better way to do this?
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