rmuir commented on PR #11906:
URL: https://github.com/apache/lucene/pull/11906#issuecomment-1307432615
I looked into why the test is taking eternity to run, the super slow merge
at the end is spending all its time clearing bitsets! Looks like the wrong
datastructure...
```
java.lang.Thread.State: RUNNABLE
at
java.util.Arrays.fill([java.base@17.0.4.1/Arrays.java:3169](http://java.base@17.0.4.1/Arrays.java:3169))
at org.apache.lucene.util.FixedBitSet.clear(FixedBitSet.java:556)
at
org.apache.lucene.util.hnsw.HnswGraphSearcher.prepareScratchState(HnswGraphSearcher.java:287)
at
org.apache.lucene.util.hnsw.HnswGraphSearcher.searchLevel(HnswGraphSearcher.java:211)
at
org.apache.lucene.util.hnsw.HnswGraphSearcher.searchLevel(HnswGraphSearcher.java:196)
at
org.apache.lucene.util.hnsw.HnswGraphBuilder.addGraphNode(HnswGraphBuilder.java:181)
at
org.apache.lucene.util.hnsw.HnswGraphBuilder.addGraphNode(HnswGraphBuilder.java:194)
at
org.apache.lucene.util.hnsw.HnswGraphBuilder.addVectors(HnswGraphBuilder.java:151)
at
org.apache.lucene.util.hnsw.HnswGraphBuilder.build(HnswGraphBuilder.java:143)
at
org.apache.lucene.codecs.lucene94.Lucene94HnswVectorsWriter.mergeOneField(Lucene94HnswVectorsWriter.java:424)
at
org.apache.lucene.codecs.perfield.PerFieldKnnVectorsFormat$FieldsWriter.mergeOneField(PerFieldKnnVectorsFormat.java:118)
at
org.apache.lucene.codecs.KnnVectorsWriter.merge(KnnVectorsWriter.java:80)
at
org.apache.lucene.index.SegmentMerger.mergeVectorValues(SegmentMerger.java:255)
at
org.apache.lucene.index.SegmentMerger$$Lambda$191/0x0000000800293730.merge(Unknown
Source)
at
org.apache.lucene.index.SegmentMerger.mergeWithLogging(SegmentMerger.java:298)
at org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:149)
```
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