Immediately complete remote tasks when not leader

Avoids edge case where set-node-state requests sent to followers would
have their response delayed indefinitely due to controller not
publishing any versions that the task's ACK barrier could be released by.

1 files changed, 15 insertions, 0 deletions

diff --git a/clustercontroller-core/src/test/java/com/yahoo/vespa/clustercontroller/core/StateChangeTest.java b/clustercontroller-core/src/test/java/com/yahoo/vespa/clustercontroller/core/StateChangeTest.java
index 49cfe8bd3b6..6a8ffae8f3f 100644
--- a/clustercontroller-core/src/test/java/com/yahoo/vespa/clustercontroller/core/StateChangeTest.java
+++ b/clustercontroller-core/src/test/java/com/yahoo/vespa/clustercontroller/core/StateChangeTest.java
@@ -1508,4 +1508,19 @@ public class StateChangeTest extends FleetControllerTest {
         assertTrue(task.isCompleted());
     }
 
+    @Test
+    public void synchronous_task_immediately_answered_when_not_leader() throws Exception {
+        FleetControllerOptions options = optionsWithZeroTransitionTime();
+        options.fleetControllerCount = 3;
+        RemoteTaskFixture fixture = createFixtureWith(options);
+
+        fixture.loseLeadership();
+        markAllNodesAsUp(options);
+
+        MockTask task = fixture.scheduleVersionDependentTaskWithSideEffects();
+
+        assertTrue(task.isInvoked());
+        assertTrue(task.isCompleted());
+    }
+
 }