From 570390c9b3353fb9b9957895cadd63211ca6bb63 Mon Sep 17 00:00:00 2001
From: Henning Baldersheim <balder@yahoo-inc.com>
Date: Thu, 2 Mar 2023 15:40:52 +0100
Subject: Compute index.maxflushed based on concurrency

---
 .../vespa/model/content/ContentSearchCluster.java  | 10 +++++++++
 .../search/test/DocumentDatabaseTestCase.java      | 24 ++++++++++++++++++++--
 2 files changed, 32 insertions(+), 2 deletions(-)

(limited to 'config-model')

diff --git a/config-model/src/main/java/com/yahoo/vespa/model/content/ContentSearchCluster.java b/config-model/src/main/java/com/yahoo/vespa/model/content/ContentSearchCluster.java
index 71726b50391..a0240d28a3c 100644
--- a/config-model/src/main/java/com/yahoo/vespa/model/content/ContentSearchCluster.java
+++ b/config-model/src/main/java/com/yahoo/vespa/model/content/ContentSearchCluster.java
@@ -426,6 +426,16 @@ public class ContentSearchCluster extends TreeConfigProducer<AnyConfigProducer>
         }
 
         builder.indexing.optimize(feedSequencerType);
+        setMaxFlushed(builder);
+    }
+
+    private void setMaxFlushed(ProtonConfig.Builder builder) {
+        // maxflushed should be moved down to proton
+        double concurrency = builder.feeding.build().concurrency();
+        if (concurrency > defaultFeedConcurrency) {
+            int maxFlushes = (int)Math.ceil(4 * concurrency);
+            builder.index.maxflushed(maxFlushes);
+        }
     }
 
     private boolean isGloballyDistributed(NewDocumentType docType) {
diff --git a/config-model/src/test/java/com/yahoo/vespa/model/search/test/DocumentDatabaseTestCase.java b/config-model/src/test/java/com/yahoo/vespa/model/search/test/DocumentDatabaseTestCase.java
index ee885cdf43e..1df297c2bfc 100644
--- a/config-model/src/test/java/com/yahoo/vespa/model/search/test/DocumentDatabaseTestCase.java
+++ b/config-model/src/test/java/com/yahoo/vespa/model/search/test/DocumentDatabaseTestCase.java
@@ -87,7 +87,7 @@ public class DocumentDatabaseTestCase {
         verifyConcurrency(nameAndModes, xmlTuning, expectedConcurrency, null);
     }
 
-    private void verifyConcurrency(List<DocType> nameAndModes, String xmlTuning, double expectedConcurrency, Double featureFlagConcurrency) {
+    private ProtonConfig getConfig(List<DocType> nameAndModes, String xmlTuning, Double featureFlagConcurrency) {
         TestProperties properties = new TestProperties();
         if (featureFlagConcurrency != null) {
             properties.setFeedConcurrency(featureFlagConcurrency);
@@ -95,10 +95,30 @@ public class DocumentDatabaseTestCase {
         var tester = new SchemaTester();
         VespaModel model = tester.createModel(nameAndModes, xmlTuning, new DeployState.Builder().properties(properties));
         ContentSearchCluster contentSearchCluster = model.getContentClusters().get("test").getSearch();
-        ProtonConfig proton = tester.getProtonConfig(contentSearchCluster);
+        return tester.getProtonConfig(contentSearchCluster);
+    }
+
+    private void verifyConcurrency(List<DocType> nameAndModes, String xmlTuning, double expectedConcurrency, Double featureFlagConcurrency) {
+        ProtonConfig proton = getConfig(nameAndModes, xmlTuning, featureFlagConcurrency);
         assertEquals(expectedConcurrency, proton.feeding().concurrency(), SMALL);
     }
 
+    private void verifyMaxflushedFollowsConcurrency(double concurrency, int maxFlushed) {
+        String feedTuning = "<feeding>  <concurrency>" + concurrency +"</concurrency>" + "</feeding>\n";
+        ProtonConfig proton = getConfig(List.of(DocType.create("a", "index")), feedTuning, null);
+        assertEquals(maxFlushed, proton.index().maxflushed());
+    }
+
+    @Test
+    public void verifyThatMaxFlushedFollowsConcurrency() {
+        verifyMaxflushedFollowsConcurrency(0.1, 2);
+        verifyMaxflushedFollowsConcurrency(0.50, 2);
+        verifyMaxflushedFollowsConcurrency(0.51, 3);
+        verifyMaxflushedFollowsConcurrency(0.75, 3);
+        verifyMaxflushedFollowsConcurrency(0.76, 4);
+        verifyMaxflushedFollowsConcurrency(1.0, 4);
+    }
+
     private void verifyFeedNiceness(List<DocType> nameAndModes, Double expectedNiceness, Double featureFlagNiceness) {
         TestProperties properties = new TestProperties();
         if (featureFlagNiceness != null) {
-- 
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