LUCENE-9731: restore consistent random seed to HnswGraphBuilder (#2299)

msokolov · web-flow · commit e2cf6ee74d21 · 2021-02-03T22:14:01.000-05:00
diff --git a/lucene/core/src/java/org/apache/lucene/codecs/lucene90/Lucene90VectorWriter.java b/lucene/core/src/java/org/apache/lucene/codecs/lucene90/Lucene90VectorWriter.java
@@ -218,7 +218,7 @@ private void writeGraph(
       }
     }
     HnswGraphBuilder hnswGraphBuilder =
-        new HnswGraphBuilder(vectorValues, maxConn, beamWidth, System.currentTimeMillis());
+        new HnswGraphBuilder(vectorValues, maxConn, beamWidth, HnswGraphBuilder.randSeed);
     hnswGraphBuilder.setInfoStream(segmentWriteState.infoStream);
     HnswGraph graph = hnswGraphBuilder.build(vectorValues.randomAccess());
 

Original file line number	Diff line number	Diff line change
`@@ -218,7 +218,7 @@ private void writeGraph(`
`218`	`218`	`}`
`219`	`219`	`}`
`220`	`220`	`HnswGraphBuilder hnswGraphBuilder =`
`221`		`- new HnswGraphBuilder(vectorValues, maxConn, beamWidth, System.currentTimeMillis());`
	`221`	`+ new HnswGraphBuilder(vectorValues, maxConn, beamWidth, HnswGraphBuilder.randSeed);`
`222`	`222`	`hnswGraphBuilder.setInfoStream(segmentWriteState.infoStream);`
`223`	`223`	`HnswGraph graph = hnswGraphBuilder.build(vectorValues.randomAccess());`
`224`	`224`