diff --git a/server/src/test/java/org/opensearch/common/cache/stats/DefaultCacheStatsHolderTests.java b/server/src/test/java/org/opensearch/common/cache/stats/DefaultCacheStatsHolderTests.java index c6e8252ddf806..8a59dd9d2d105 100644 --- a/server/src/test/java/org/opensearch/common/cache/stats/DefaultCacheStatsHolderTests.java +++ b/server/src/test/java/org/opensearch/common/cache/stats/DefaultCacheStatsHolderTests.java @@ -127,49 +127,58 @@ public void testCount() throws Exception { } public void testConcurrentRemoval() throws Exception { - List dimensionNames = List.of("dim1", "dim2"); + List dimensionNames = List.of("A", "B"); DefaultCacheStatsHolder cacheStatsHolder = new DefaultCacheStatsHolder(dimensionNames, storeName); // Create stats for the following dimension sets - List> populatedStats = List.of(List.of("A1", "B1"), List.of("A2", "B2"), List.of("A2", "B3")); + List> populatedStats = new ArrayList<>(); + int numAValues = 10; + int numBValues = 2; + for (int indexA = 0; indexA < numAValues; indexA++) { + for (int indexB = 0; indexB < numBValues; indexB++) { + populatedStats.add(List.of("A" + indexA, "B" + indexB)); + } + } for (List dims : populatedStats) { cacheStatsHolder.incrementHits(dims); } - // Remove (A2, B2) and (A1, B1), before re-adding (A2, B2). At the end we should have stats for (A2, B2) but not (A1, B1). - - Thread[] threads = new Thread[3]; - CountDownLatch countDownLatch = new CountDownLatch(3); - threads[0] = new Thread(() -> { - cacheStatsHolder.removeDimensions(List.of("A2", "B2")); - countDownLatch.countDown(); - }); - threads[1] = new Thread(() -> { - cacheStatsHolder.removeDimensions(List.of("A1", "B1")); - countDownLatch.countDown(); - }); - threads[2] = new Thread(() -> { - cacheStatsHolder.incrementMisses(List.of("A2", "B2")); - cacheStatsHolder.incrementMisses(List.of("A2", "B3")); - countDownLatch.countDown(); - }); + // Remove a subset of the dimensions concurrently. + // Remove both (A0, B0), and (A0, B1), so we expect the intermediate node for A0 to be null afterwards. + // For all the others, remove only the B0 value. Then we expect the intermediate nodes for A1 through A9 to be present + // and reflect only the stats for their B1 child. + + Thread[] threads = new Thread[numAValues + 1]; + for (int i = 0; i < numAValues; i++) { + int finalI = i; + threads[i] = new Thread(() -> { cacheStatsHolder.removeDimensions(List.of("A" + finalI, "B0")); }); + } + threads[numAValues] = new Thread(() -> { cacheStatsHolder.removeDimensions(List.of("A0", "B1")); }); for (Thread thread : threads) { thread.start(); - // Add short sleep to ensure threads start their functions in order (so that incrementing doesn't happen before removal) - Thread.sleep(1); } - countDownLatch.await(); - assertNull(getNode(List.of("A1", "B1"), cacheStatsHolder.getStatsRoot())); - assertNull(getNode(List.of("A1"), cacheStatsHolder.getStatsRoot())); - assertNotNull(getNode(List.of("A2", "B2"), cacheStatsHolder.getStatsRoot())); - assertEquals( - new ImmutableCacheStats(0, 1, 0, 0, 0), - getNode(List.of("A2", "B2"), cacheStatsHolder.getStatsRoot()).getImmutableStats() - ); - assertEquals( - new ImmutableCacheStats(1, 1, 0, 0, 0), - getNode(List.of("A2", "B3"), cacheStatsHolder.getStatsRoot()).getImmutableStats() - ); + for (Thread thread : threads) { + thread.join(); + } + + // intermediate node for A0 should be null + assertNull(getNode(List.of("A0"), cacheStatsHolder.getStatsRoot())); + + // leaf nodes for all B0 values should be null since they were removed + for (int indexA = 0; indexA < numAValues; indexA++) { + assertNull(getNode(List.of("A" + indexA, "B0"), cacheStatsHolder.getStatsRoot())); + } + + // leaf nodes for all B1 values, except (A0, B1), should not be null as they weren't removed, + // and the intermediate nodes A1 through A9 shouldn't be null as they have remaining children + for (int indexA = 1; indexA < numAValues; indexA++) { + DefaultCacheStatsHolder.Node b1LeafNode = getNode(List.of("A" + indexA, "B1"), cacheStatsHolder.getStatsRoot()); + assertNotNull(b1LeafNode); + assertEquals(new ImmutableCacheStats(1, 0, 0, 0, 0), b1LeafNode.getImmutableStats()); + DefaultCacheStatsHolder.Node intermediateLevelNode = getNode(List.of("A" + indexA), cacheStatsHolder.getStatsRoot()); + assertNotNull(intermediateLevelNode); + assertEquals(b1LeafNode.getImmutableStats(), intermediateLevelNode.getImmutableStats()); + } } /**