1 files changed, 13 insertions, 1 deletions
diff --git a/vespa-http-client/src/main/java/com/yahoo/vespa/http/client/core/operationProcessor/OperationProcessor.java b/vespa-http-client/src/main/java/com/yahoo/vespa/http/client/core/operationProcessor/OperationProcessor.java
index cff6ad2ed48..d300bead9c1 100644
--- a/vespa-http-client/src/main/java/com/yahoo/vespa/http/client/core/operationProcessor/OperationProcessor.java
+++ b/vespa-http-client/src/main/java/com/yahoo/vespa/http/client/core/operationProcessor/OperationProcessor.java
@@ -18,8 +18,11 @@ import java.security.SecureRandom;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.HashSet;
+import java.util.Iterator;
+import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Random;
 import java.util.Set;
 import java.util.concurrent.ScheduledThreadPoolExecutor;
@@ -35,7 +38,7 @@ import java.util.logging.Logger;
 public class OperationProcessor {
 
     private static final Logger log = Logger.getLogger(OperationProcessor.class.getName());
-    private final Map<String, DocumentSendInfo> docSendInfoByOperationId = new HashMap<>();
+    private final Map<String, DocumentSendInfo> docSendInfoByOperationId = new LinkedHashMap<>();
     private final ArrayListMultimap<String, Document> blockedDocumentsByDocumentId = ArrayListMultimap.create();
     private final Set<String> inflightDocumentIds = new HashSet<>();
     private final int numDestinations;
@@ -103,6 +106,15 @@ public class OperationProcessor {
         }
     }
 
+    /** Returns the id of the oldest operation to be sent. */
+    public Optional<String> oldestIncompleteResultId() {
+        synchronized (monitor) {
+            return docSendInfoByOperationId.isEmpty()
+                    ? Optional.empty()
+                    : Optional.of(docSendInfoByOperationId.keySet().iterator().next());
+        }
+    }
+
     public String getClientId() {
         return clientId;
     }