Fix handling of duplicate error messages in test cluster logs (#69494)

buildSrc/src/main/java/org/elasticsearch/gradle/testclusters/ElasticsearchNode.java

@@ -22,6 +22,7 @@ import org.elasticsearch.gradle.Version;
 import org.elasticsearch.gradle.VersionProperties;
 import org.elasticsearch.gradle.http.WaitForHttpResource;
 import org.elasticsearch.gradle.info.BuildParams;
+import org.elasticsearch.gradle.util.Pair;
 import org.gradle.api.Action;
 import org.gradle.api.Named;
 import org.gradle.api.NamedDomainObjectContainer;
@@ -83,6 +84,7 @@ import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
 import static java.util.Objects.requireNonNull;
+import static java.util.Optional.ofNullable;
 
 public class ElasticsearchNode implements TestClusterConfiguration {
 
@@ -948,7 +950,7 @@ public class ElasticsearchNode implements TestClusterConfiguration {
     }
 
     private void logFileContents(String description, Path from, boolean tailLogs) {
-        final Map<String, Integer> errorsAndWarnings = new LinkedHashMap<>();
+        final Map<String, Pair<String, Integer>> errorsAndWarnings = new LinkedHashMap<>();
         LinkedList<String> ring = new LinkedList<>();
         try (LineNumberReader reader = new LineNumberReader(Files.newBufferedReader(from))) {
             for (String line = reader.readLine(); line != null; line = reader.readLine()) {
@@ -960,10 +962,18 @@ public class ElasticsearchNode implements TestClusterConfiguration {
                         lineToAdd = line;
                         // check to see if the previous message (possibly combined from multiple lines) was an error or
                         // warning as we want to show all of them
-                        String previousMessage = normalizeLogLine(ring.getLast());
-                        if (MESSAGES_WE_DONT_CARE_ABOUT.stream().noneMatch(previousMessage::contains)
-                            && (previousMessage.contains("ERROR") || previousMessage.contains("WARN"))) {
-                            errorsAndWarnings.put(ring.getLast(), errorsAndWarnings.getOrDefault(previousMessage, 0) + 1);
+                        String normalizedMessage = normalizeLogLine(ring.getLast());
+                        if (MESSAGES_WE_DONT_CARE_ABOUT.stream().noneMatch(normalizedMessage::contains)
+                            && (normalizedMessage.contains("ERROR") || normalizedMessage.contains("WARN"))) {
+
+                            // De-duplicate repeated errors
+                            errorsAndWarnings.put(
+                                normalizedMessage,
+                                Pair.of(
+                                    ring.getLast(), // Original, non-normalized message (so we keep the first timestamp)
+                                    ofNullable(errorsAndWarnings.get(normalizedMessage)).map(p -> p.right() + 1).orElse(1)
+                                )
+                            );
                         }
                     } else {
                         // We combine multi line log messages to make sure we never break exceptions apart
@@ -996,10 +1006,10 @@ public class ElasticsearchNode implements TestClusterConfiguration {
             }
             if (errorsAndWarnings.isEmpty() == false) {
                 LOGGER.lifecycle("\n»    ↓ errors and warnings from " + from + " ↓");
-                errorsAndWarnings.forEach((message, count) -> {
-                    LOGGER.lifecycle("» " + message.replace("\n", "\n»  "));
-                    if (count > 1) {
-                        LOGGER.lifecycle("»   ↑ repeated " + count + " times ↑");
+                errorsAndWarnings.forEach((key, pair) -> {
+                    LOGGER.lifecycle("» " + pair.left().replace("\n", "\n»  "));
+                    if (pair.right() > 1) {
+                        LOGGER.lifecycle("»   ↑ repeated " + pair.right() + " times ↑");
                     }
                 });
             }

buildSrc/src/main/java/org/elasticsearch/gradle/util/Pair.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+package org.elasticsearch.gradle.util;
+
+public class Pair<L, R> {
+    private final L left;
+    private final R right;
+
+    private Pair(L left, R right) {
+        this.left = left;
+        this.right = right;
+    }
+
+    public static <L, R> Pair<L, R> of(L left, R right) {
+        return new Pair<>(left, right);
+    }
+
+    public L left() {
+        return left;
+    }
+
+    public R right() {
+        return right;
+    }
+}