From 2f00e0d1deec739298483175e3c1de55209e58e8 Mon Sep 17 00:00:00 2001
From: Harald Musum <musum@yahooinc.com>
Date: Wed, 13 Oct 2021 12:41:55 +0200
Subject: Log redeployed apps only when there are changes in deployed apps

---
 .../vespa/config/server/ConfigServerBootstrap.java | 38 +++++++++++++++++-----
 1 file changed, 29 insertions(+), 9 deletions(-)

diff --git a/configserver/src/main/java/com/yahoo/vespa/config/server/ConfigServerBootstrap.java b/configserver/src/main/java/com/yahoo/vespa/config/server/ConfigServerBootstrap.java
index 65ffb916294..53c53a22609 100644
--- a/configserver/src/main/java/com/yahoo/vespa/config/server/ConfigServerBootstrap.java
+++ b/configserver/src/main/java/com/yahoo/vespa/config/server/ConfigServerBootstrap.java
@@ -256,7 +256,7 @@ public class ConfigServerBootstrap extends AbstractComponent implements Runnable
         int applicationCount = deployments.size();
         Set<ApplicationId> failedDeployments = new LinkedHashSet<>();
         Set<ApplicationId> finishedDeployments = new LinkedHashSet<>();
-        Instant lastLogged = Instant.EPOCH;
+        LogState logState = new LogState(applicationCount);
 
         do {
             deployments.forEach((applicationId, future) -> {
@@ -276,19 +276,19 @@ public class ConfigServerBootstrap extends AbstractComponent implements Runnable
                         throw new IllegalArgumentException("Unknown deployment status " + status);
                 }
             });
-            if ( ! Duration.between(lastLogged, Instant.now()).minus(Duration.ofSeconds(10)).isNegative()) {
-                logProgress(applicationCount, failedDeployments, finishedDeployments);
-                lastLogged = Instant.now();
-            }
+            logProgress(logState, failedDeployments.size(), finishedDeployments.size());
         } while (failedDeployments.size() + finishedDeployments.size() < applicationCount);
 
-        logProgress(applicationCount, failedDeployments, finishedDeployments);
         return new ArrayList<>(failedDeployments);
     }
 
-    private void logProgress(int applicationCount, Set<ApplicationId> failedDeployments, Set<ApplicationId> finishedDeployments) {
-        log.log(Level.INFO, () -> finishedDeployments.size() + " of " + applicationCount + " apps redeployed " +
-                                  "(" + failedDeployments.size() + " failed)");
+    private void logProgress(LogState logState, int failedDeployments, int finishedDeployments) {
+        if ( ! Duration.between(logState.lastLogged, Instant.now()).minus(Duration.ofSeconds(10)).isNegative()
+                && (logState.failedDeployments != failedDeployments || logState.finishedDeployments != finishedDeployments)) {
+            log.log(Level.INFO, () -> finishedDeployments + " of " + logState.applicationCount + " apps redeployed " +
+                    "(" + failedDeployments + " failed)");
+            logState.update(Instant.now(), failedDeployments, finishedDeployments);
+        }
     }
 
     private DeploymentStatus getDeploymentStatus(ApplicationId applicationId, Future<?> future) {
@@ -308,5 +308,25 @@ public class ConfigServerBootstrap extends AbstractComponent implements Runnable
         }
     }
 
+    private static class LogState {
+
+        private final int applicationCount;
+
+        private Instant lastLogged = Instant.EPOCH;
+        private int failedDeployments = 0;
+        private int finishedDeployments = 0;
+
+        public LogState(int applicationCount) {
+            this.applicationCount = applicationCount;
+        }
+
+        public void update(Instant lastLogged, int failedDeployments, int finishedDeployments) {
+            this.lastLogged = lastLogged;
+            this.failedDeployments = failedDeployments;
+            this.finishedDeployments = finishedDeployments;
+        }
+
+    }
+
 }
 
-- 
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