(flink) branch master updated: [FLINK-39902][tests] Fix race in RescaleTimelineITCase.testRescaleTerminatedByJobFinished (#28378)

[panyuepeng]

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The following commit(s) were added to refs/heads/master by this push:
     new ef4d88e2e50 [FLINK-39902][tests] Fix race in 
RescaleTimelineITCase.testRescaleTerminatedByJobFinished (#28378)
ef4d88e2e50 is described below

commit ef4d88e2e50577d98a13fa405c41c2cf4b386286
Author: Martijn Visser <2989614+martijnvis...@users.noreply.github.com>
AuthorDate: Sat Jun 13 09:04:40 2026 +0200

    [FLINK-39902][tests] Fix race in 
RescaleTimelineITCase.testRescaleTerminatedByJobFinished (#28378)
    
    Unblocking the task raced with the scheduler recording the second rescale; 
on
    a slow machine the job finished first, leaving the history at size 1 and
    timing out the wait. Wait for the rescale to be recorded before unblocking.
    
    The assumeThat(enabledRescaleHistory) check had to move before the update 
RPC
    because the new size-2 history wait is only meaningful when rescale history 
is
    enabled; for the disabled parameter the history never grows and the wait 
would
    hang.
    
    Generated-by: Claude Opus 4.8 (1M context)
---
 .../scheduler/adaptive/timeline/RescaleTimelineITCase.java     | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git 
a/flink-runtime/src/test/java/org/apache/flink/runtime/scheduler/adaptive/timeline/RescaleTimelineITCase.java
 
b/flink-runtime/src/test/java/org/apache/flink/runtime/scheduler/adaptive/timeline/RescaleTimelineITCase.java
index fd12bc5de7f..2a04d302428 100644
--- 
a/flink-runtime/src/test/java/org/apache/flink/runtime/scheduler/adaptive/timeline/RescaleTimelineITCase.java
+++ 
b/flink-runtime/src/test/java/org/apache/flink/runtime/scheduler/adaptive/timeline/RescaleTimelineITCase.java
@@ -276,11 +276,19 @@ class RescaleTimelineITCase {
 
         waitForVertexParallelismReachedAndJobRunning(jobGraph, JOB_VERTEX_ID, 
PARALLELISM);
 
+        assumeThat(enabledRescaleHistory(configuration)).isTrue();
+
         updateJobResourceRequirements(miniCluster, jobGraph, 1, PARALLELISM * 
2);
 
+        // The upper bound (PARALLELISM * 2) exceeds the available slots, so 
this rescale is only
+        // recorded in the history without changing the parallelism. Wait 
until it is recorded
+        // before unblocking, otherwise on a slow machine the task can finish 
first and the size-2
+        // condition below times out.
+        waitUntilConditionWithTimeout(
+                () -> getRescaleHistory(miniCluster, jobGraph).size() == 2, 
10000);
+
         OnceBlockingNoOpInvokable.unblock();
 
-        assumeThat(enabledRescaleHistory(configuration)).isTrue();
         waitUntilConditionWithTimeout(
                 () -> {
                     List<Rescale> rescaleHistory = 
getRescaleHistory(miniCluster, jobGraph);