s1monw commented on a change in pull request #731: LUCENE-8865: Move to
executor in IndexSearcher
URL: https://github.com/apache/lucene-solr/pull/731#discussion_r295483294
##########
File path: lucene/core/src/test/org/apache/lucene/search/TestIndexSearcher.java
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@@ -237,4 +241,28 @@ public void testGetSlices() throws Exception {
service.shutdown();
IOUtils.close(r, dir);
}
+
+ public void testOneSegmentExecutesOnTheCallerThread() throws IOException {
+ List<LeafReaderContext> leaves = reader.leaves();
+ AtomicInteger numExecutions = new AtomicInteger(0);
+ IndexSearcher searcher = new IndexSearcher(reader, task -> {
+ numExecutions.incrementAndGet();
+ task.run();
+ }) {
+ @Override
+ protected LeafSlice[] slices(List<LeafReaderContext> leaves) {
+ ArrayList<LeafSlice> slices = new ArrayList<>();
+ for (LeafReaderContext ctx : leaves) {
+ slices.add(new LeafSlice(Arrays.asList(ctx)));
+ }
+ return slices.toArray(new LeafSlice[0]);
+ }
+ };
+ searcher.search(new MatchAllDocsQuery(), 10);
+ if (leaves.size() <= 1) {
Review comment:
it's in theory possible to have 0 leaves. That's why I did that
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