Adds bundleFinalizer support to Dataflow non-portable worker. by acrites · Pull Request #37723 · apache/beam

acrites · 2026-02-26T22:33:03Z

This PR modifies the existing StreamingCommitFinalizer cache used for source checkpoint callbacks, but adds the ability to specify a callback expiration. This was done by mimic-ing the code in the portable runner's sdks/java/harness/src/main/java/org/apache/beam/fn/harness/control/FinalizeBundleHandler.java.

We needed to expose more already-existing fields in the Windmill proto for bundle finalization ids. Windmill is already reading from and populating these fields for the portable runner.

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gemini-code-assist · 2026-02-26T22:33:30Z

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the Dataflow non-portable worker by introducing robust support for bundle finalization. The changes enable the worker to register and manage callbacks that execute after a bundle's state has been successfully committed, complete with an expiration mechanism. This brings the non-portable runner closer in functionality to its portable counterpart, improving consistency and reliability in how bundle-level finalization tasks are handled in streaming pipelines.

Highlights

Bundle Finalizer Support: Introduced BundleFinalizer support within the SimpleDoFnRunner for StartBundle and FinishBundle contexts, allowing callbacks to be registered for execution upon bundle commit.
Enhanced StreamingCommitFinalizer: Refactored StreamingCommitFinalizer to manage bundle finalization callbacks with an expiration mechanism, mimicking the portable runner's FinalizeBundleHandler. This new implementation uses a PriorityQueue and ReentrantLock for efficient, thread-safe management and cleanup of expired callbacks.
Windmill Proto Updates: Extended the Windmill protocol buffers to include applied_finalize_ids in WorkItem and StreamingGetWorkResponseChunk messages, and finalize_ids in WorkItemCommitRequest, enabling the Dataflow worker to communicate bundle finalization IDs with the Windmill service.
Dataflow Worker Integration: Integrated the new bundle finalization logic into StreamingModeExecutionContext to collect and manage BundleFinalizer callbacks, and updated StreamingWorkScheduler to process these applied_finalize_ids received from Windmill.
Comprehensive Testing: Added new unit tests for SimpleParDoFn to verify BundleFinalizer functionality and introduced a dedicated test suite for the refactored StreamingCommitFinalizer to ensure correct behavior, including expiration and duplicate ID handling.

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Changelog

runners/core-java/src/main/java/org/apache/beam/runners/core/SimpleDoFnRunner.java
- Added bundleFinalizer() method to StartBundleContext and FinishBundleContext.
- Updated UnsupportedOperationException messages for bundleFinalizer() in OnTimer and OnWindowExpiration contexts for clarity.
runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/StreamingModeExecutionContext.java
- Added necessary imports for ArrayList, BundleFinalizer, and Pair.
- Modified flushState() to return Map<Long, Pair<Instant, Runnable>> and incorporate BundleFinalizer callbacks with expiration.
- Updated flushState() to apply an expiration to checkpointMark.finalizeCheckpoint() callbacks.
- Implemented bundleFinalizer() in DataflowStepContext.
- Introduced WindmillBundleFinalizer as an inner class to manage BundleFinalizer.Callback instances with associated expiration times.
- Added getBundleFinalizerCallbacks() and clearBundleFinalizerCallbacks() methods to StepContext.
runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/windmill/client/grpc/GetWorkResponseChunkAssembler.java
- Added a new field appliedFinalizeIds to track bundle finalization IDs.
- Updated the append method to collect appliedFinalizeIds from incoming chunks.
- Corrected a minor typo in a Javadoc comment.
- Modified the flushToWorkItem and create methods to pass and process appliedFinalizeIds when assembling WorkItem objects, and ensured appliedFinalizeIds are cleared after use.
runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/windmill/work/processing/StreamingCommitFinalizer.java
- Completely refactored the class to use ReentrantLock, Condition, HashMap, and PriorityQueue for managing callbacks with expiration.
- Removed the Guava Cache dependency and its associated default expiry mechanism.
- Introduced an AutoValue class FinalizationInfo to encapsulate callback details and expiration.
- Implemented a cleanupThreadBody() method for background processing and removal of expired callbacks.
- Updated cacheCommitFinalizers to store callbacks with their expiration times and add them to the priority queue.
- Modified finalizeCommits to safely remove callbacks from both the map and priority queue.
- Added cleanupQueueSize() for testing purposes.
runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/windmill/work/processing/StreamingWorkScheduler.java
- Added a call to commitFinalizer.finalizeCommits(workItem.getAppliedFinalizeIdsList()) to process bundle finalization IDs.
runners/google-cloud-dataflow-java/worker/src/test/java/org/apache/beam/runners/dataflow/worker/SimpleParDoFnTest.java
- Added imports for AtomicInteger, DataflowStepContext, VarLongCoder, BundleFinalizer, Duration, Instant, and Mockito.
- Introduced testBundleFinalizer() to validate the functionality of BundleFinalizer within SimpleParDoFn.
- Added helper methods increaseBundleSuccessCount() and getBundleSuccessCount() for test assertions.
- Defined WithBundleFinalizerDoFn as a test DoFn to demonstrate BundleFinalizer usage in StartBundle, ProcessElement, and FinishBundle.
runners/google-cloud-dataflow-java/worker/src/test/java/org/apache/beam/runners/dataflow/worker/windmill/work/processing/StreamingCommitFinalizerTest.java
- Added a new test file StreamingCommitFinalizerTest.java to provide comprehensive unit tests for the refactored StreamingCommitFinalizer.
- Included tests for initialization, caching callbacks, handling duplicate IDs, successful finalization, ignoring unknown IDs, and verifying cleanup of expired callbacks.
runners/google-cloud-dataflow-java/worker/windmill/src/main/proto/windmill.proto
- Added repeated int64 applied_finalize_ids = 16; to the WorkItem message.
- Added repeated int64 finalize_ids = 19 [packed = true]; to the WorkItemCommitRequest message, along with a description.
- Added repeated int64 applied_finalize_ids = 6 [packed = true]; to the StreamingGetWorkResponseChunk message, along with a description.
- Updated reserved field ranges in WorkItem, WorkItemCommitRequest, and StreamingGetWorkResponseChunk to accommodate new fields.

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…running on Dataflow streaming non-portable worker.

github-actions · 2026-02-27T03:04:08Z

Checks are failing. Will not request review until checks are succeeding. If you'd like to override that behavior, comment assign set of reviewers

scwhittle · 2026-02-27T08:38:36Z

...g/apache/beam/runners/dataflow/worker/windmill/work/processing/StreamingCommitFinalizer.java

-            },
-            0);
+      @Nullable FinalizationInfo info;
+      lock.lock();


how about locking once and pulling out all the callbacks and then executing them?

previously we were finalizing on the provided executor, it seems we should we that behavior?

Good call! I think I was worried about running the callbacks with the lock held, but that's not a problem. Also added back in running them on the executor instead of inline.

…callbacks in the given executor. This required changing tests since the callbacks are now running asynchronously.

scwhittle · 2026-03-02T12:00:18Z

...g/apache/beam/runners/dataflow/worker/windmill/work/processing/StreamingCommitFinalizer.java

    }
  }
+
+  // Only exposed for tests.


does package private work? ie drop public

There is also the @VisibleForTest annotation for things like this

Looks like we can just drop public.

...org/apache/beam/runners/dataflow/worker/windmill/work/processing/StreamingWorkScheduler.java

...ache/beam/runners/dataflow/worker/windmill/work/processing/StreamingCommitFinalizerTest.java

scwhittle · 2026-03-02T12:09:51Z

...ache/beam/runners/dataflow/worker/windmill/work/processing/StreamingCommitFinalizerTest.java

+    while (executor.elementsOutstanding() > 1) {
+      Thread.sleep(500);
+    }
+    verify(callback).run();


instead of a mock runnable how about a runnable that counts down a CountDownLatch. then you can just block on that instead of using the less direct elementsOutstanding

...ache/beam/runners/dataflow/worker/windmill/work/processing/StreamingCommitFinalizerTest.java

scwhittle · 2026-03-02T12:13:21Z

...ache/beam/runners/dataflow/worker/windmill/work/processing/StreamingCommitFinalizerTest.java

+        ImmutableMap.of(3L, Pair.of(Instant.now().plus(Duration.millis(100)), callback3)));
+
+    while (finalizer.cleanupQueueSize() > 1) {
+      // Wait until it expires


nit: until the two short timeouts expire.

scwhittle · 2026-03-02T12:17:59Z

...low-java/worker/src/test/java/org/apache/beam/runners/dataflow/worker/SimpleParDoFnTest.java

+        Mockito.mock(
+            DataflowStepContext.class,
+            invocation -> {
+              if (invocation.getMethod().getName().equals("bundleFinalizer")) {


Do we need this here? Why on both on the DataflowStepContext and DataflowExecutionContext.DataflowStepContext? Maybe some comments to help explain

I think you're right. This test is only calling user bundle finalizers, so we only need it mocked on userStepContext.

scwhittle · 2026-03-02T12:19:16Z

...low-java/worker/src/test/java/org/apache/beam/runners/dataflow/worker/SimpleParDoFnTest.java

+
+    // The counter increases by 1 in StartBundle, 5 in ProcessElement, and 1 in FinishBundle.
+    // Total should be 7.
+    assertThat(getBundleSuccessCount(), equalTo(7));


maybe better to just duplicate the Atomics and methods so that you can explicitly verify that start/ 5 process /finish are called.

I duplicated the Atomics, but got rid of the accessor methods to reduce boilerplate.

...low-java/worker/src/test/java/org/apache/beam/runners/dataflow/worker/SimpleParDoFnTest.java

scwhittle

Remove the testing exclusion here as well:

beam/runners/google-cloud-dataflow-java/build.gradle

Line 206 in 3197d88

'org.apache.beam.sdk.testing.UsesBundleFinalizer',

You can modify https://github.com/apache/beam/blob/3197d88ef5c9f41371756c78b0efca8590b47165/.github/trigger_files/beam_PostCommit_Java_ValidatesRunner_Dataflow_Streaming.json to trigger these tests before submitting.

That is making me realize that you might still want to reject or filter batch jobs on non-portable runner that are attempting to use bundle finalizers. I don't think that it is worth trying to implement that for batch if it doesn't work since those users can just continue to use portable runner which is the default.

...g/apache/beam/runners/dataflow/worker/windmill/work/processing/StreamingCommitFinalizer.java

scwhittle · 2026-03-03T08:41:57Z

...ache/beam/runners/dataflow/worker/windmill/work/processing/StreamingCommitFinalizerTest.java

    while (finalizer.cleanupQueueSize() > 1) {
-      // Wait until it expires
+      // Wait until the two 100ms timeouts expire.
      Thread.sleep(500);


nit: might as well make this 110 or something that will likely be enough and shorter, gradle doesn't have great parallelism

Done. Reduced most of the sleeps.

scwhittle · 2026-03-03T08:43:43Z

...low-java/worker/src/test/java/org/apache/beam/runners/dataflow/worker/SimpleParDoFnTest.java

-  static int getBundleSuccessCount() {
-    return bundleSuccessCount.get();
-  }
+  private static final AtomicInteger startBundleCount = new AtomicInteger(0);


nit: move these into WithBundleFinalizerDoFn to scope them better?

acrites · 2026-03-04T19:19:11Z

I went ahead and added back in the check for batch, non-portable bundle finalizers.

…able BundleFinalizers.

…to bundle-finalizer

scwhittle · 2026-03-05T09:38:56Z

.../apache/beam/runners/dataflow/worker/windmill/client/grpc/GetWorkResponseChunkAssembler.java

@@ -102,14 +105,16 @@ private Optional<AssembledWorkItem> flushToWorkItem() {
              workItemBuilder.build(),


add the appliedFinalizeIds to the work item builder before building instead of passing to create? or could remove the list and just add to the builder where we are currently adding to the list.

Otherwise I had a concern we were passing out mutable list outside this class. It is safe since we can that create below is just iterating and not keeping a reference to it but seems like we might as well do it here so it's clearer.

Nice. That seems a bit clearer. Now I don't even have to pass them to the AssembledWorkItem.

scwhittle · 2026-03-05T09:40:18Z

...g/apache/beam/runners/dataflow/worker/windmill/work/processing/StreamingCommitFinalizer.java

 package org.apache.beam.runners.dataflow.worker.windmill.work.processing;

-import java.time.Duration;
+import static com.google.common.base.Preconditions.checkState;


think this needs to be the vendored one?

scwhittle · 2026-03-05T09:44:48Z

...g/apache/beam/runners/dataflow/worker/windmill/work/processing/StreamingCommitFinalizer.java

+    }
+    for (Runnable callback : callbacksToExecute) {
+      try {
+        finalizationExecutor.execute(callback, 0);


why the 0? can just execute(runnable) method be called?

I was trying to preserve the original behavior. It looks like I should actually call forceExecute(callback, 0) to match the previous behavior. This ignores the elementsOutstanding limit. I'll change it to that to keep things as similar to the original.

(BoundedQueueExecutor doesn't have a execute(runnable) method.) I wonder if, since all my calls to execute are forceExecute, we might consider changing to a completely different executor class. We could move to the simpler java.util.concurrent.ExecutorService. WDYT?

...g/apache/beam/runners/dataflow/worker/windmill/work/processing/StreamingCommitFinalizer.java

scwhittle · 2026-03-05T09:54:14Z

...ker/src/main/java/org/apache/beam/runners/dataflow/worker/StreamingModeExecutionContext.java

      return checkNotNull(userTimerInternals);
    }
+
+    public List<Pair<Instant, BundleFinalizer.Callback>> getBundleFinalizerCallbacks() {


this is returning mutable internal state, it seems we just call this before clearing though. How about making this a flushBundleFinalizerCallbacks method that combines both? Could use an ImmutableList.Builder and reset it only if non-empty

Thanks for the suggestion! I think I captured it correctly.

scwhittle · 2026-03-05T09:56:55Z

...ache/beam/runners/dataflow/worker/windmill/work/processing/StreamingCommitFinalizerTest.java

+    finalizer.cacheCommitFinalizers(
+        ImmutableMap.of(1L, Pair.of(Instant.now().plus(Duration.standardHours(1)), callback)));
+    finalizer.finalizeCommits(Collections.singletonList(2L));
+    while (executor.elementsOutstanding() > 1) {


can you just assert it is 1 here instead of a loop?

scwhittle · 2026-03-05T09:58:41Z

...ache/beam/runners/dataflow/worker/windmill/work/processing/StreamingCommitFinalizerTest.java

+    }
+    // We can call finalize even though these were already cleaned up.
+    finalizer.finalizeCommits(ImmutableList.of(2L, 3L));
+    while (executor.elementsOutstanding() > 1) {


could do this before the finalizeCommits above, and assert it is 1 after calling it instead

runners/google-cloud-dataflow-java/build.gradle

scwhittle · 2026-03-09T08:54:30Z

...ker/src/main/java/org/apache/beam/runners/dataflow/worker/StreamingModeExecutionContext.java

+    List<Pair<Instant, BundleFinalizer.Callback>> bundleFinalizers = new ArrayList<>();
    for (StepContext stepContext : getAllStepContexts()) {
      stepContext.flushState();
+      bundleFinalizers.addAll(stepContext.flushBundleFinalizerCallbacks());


nit: it doesn't seem like we need bundleFinalizers all at once. We could save the allocation by getting rid of it and just iterate over the callbacks here and add them to the callbacks map

runners/google-cloud-dataflow-java/build.gradle

…. Adds missing bundleFinalizer from SDF. Retriggering ValidatesRunner tests.

scwhittle · 2026-03-16T08:55:12Z

validates runners tests still has some errors: https://github.com/apache/beam/runs/67043286782

Also not sure if the StreamingDataflowWorkerTest errors are real. They could be because you are using the executor now for the background thread and some tests uses a fake executor.

beam/runners/google-cloud-dataflow-java/worker/src/test/java/org/apache/beam/runners/dataflow/worker/StreamingDataflowWorkerTest.java

Line 4689 in 914e425

private class FakeScheduledExecutor implements ScheduledExecutorService {

One idea (other than fixing that fake impl) woudl be to make the background cleanup thread lazily created whenever the first finalization is added

… and pipelines that don't have any callbacks.

…idates runner tests.

scwhittle · 2026-03-18T09:40:15Z

runners/google-cloud-dataflow-java/build.gradle

  dependsOn(createLegacyWorkerValidatesRunnerTest(validatesRunnerStreamingConfig + [
    name: 'validatesRunnerLegacyWorkerTestStreaming',
+    // Streaming appliance currently fails bundle finalizer tests.
+    excludedCategories: [ 'org.apache.beam.sdk.testing.UsesBundleFinalizer', ],


I think this is overwriting the excluded categories instead of merging, and thus losing those from line 466

should be something like
excludedCategories: validatesRunnerStreamingConfig.excludedCategories + ...

Thanks, that was a silly mistake. It explains why all the Validates runner tests were failing...

…laredArtigfact build errors and fixes bug in ValidatesRunner streaming test which was not excluding all categories. Retriggering post submits.

acrites · 2026-03-19T16:20:40Z

Failing beam_PreCommit_Java test is from org.apache.beam.runners.fnexecution.logging.GrpcLoggingServiceTest. testMultipleClientsFailingIsHandledGracefullyByServer, so probably not related. ValidatesRunner post commit is now passing.

scwhittle · 2026-03-20T08:31:13Z

Yes that failure looked unrelated, I sent out a PR yesterday to try to deflake it.

Adds bundleFinalizer support to non-portable worker.

fda75e0

github-actions bot added runners dataflow core labels Feb 26, 2026

Removes check preventing stateful DoFn's with bundle finalizers from …

1ec825d

…running on Dataflow streaming non-portable worker.

scwhittle requested changes Feb 27, 2026

View reviewed changes

Changes finalize method to only acquire the lock once. Runs finalize …

4694de8

…callbacks in the given executor. This required changing tests since the callbacks are now running asynchronously.

scwhittle requested changes Mar 2, 2026

View reviewed changes

Addresses PR review comments, mostly around improving tests.

8570168

scwhittle requested changes Mar 3, 2026

View reviewed changes

acrites added 4 commits March 4, 2026 11:25

Addresses minor code comments. Adds back in tests for batch, non-port…

5e1642c

…able BundleFinalizers.

Merge branch 'master' into bundle-finalizer

a65b537

Ran spotlessApply

6dcafc4

Merge branch 'bundle-finalizer' of https://github.com/acrites/beam in…

081a900

…to bundle-finalizer

scwhittle requested changes Mar 5, 2026

View reviewed changes

Addresses more PR review comments. Triggering validates runner tests.

7413001

scwhittle approved these changes Mar 9, 2026

View reviewed changes

acrites added 2 commits March 9, 2026 13:44

Adds finalization callbacks directly when flushing instead of copying…

5b24e50

…. Adds missing bundleFinalizer from SDF. Retriggering ValidatesRunner tests.

Ran spotlessApply and retriggering streaming ValidatesRunner tests.

4f01761

scwhittle approved these changes Mar 10, 2026

View reviewed changes

acrites added 2 commits March 13, 2026 11:04

Retriggering validates runner tests.

591aeaa

Changes Long to long for build error.

d7df552

acrites added 3 commits March 16, 2026 11:29

Starts finalization callback cleanup thread lazily. This is for tests…

a50b859

… and pipelines that don't have any callbacks.

Merge remote-tracking branch 'upstream/master' into bundle-finalizer

047592e

Excludes bundle finalizer tests for appliance only and retriggers val…

7c62f6f

…idates runner tests.

scwhittle requested changes Mar 18, 2026

View reviewed changes

Switches which Pair library being imported since it was causing undec…

24ce8f6

…laredArtigfact build errors and fixes bug in ValidatesRunner streaming test which was not excluding all categories. Retriggering post submits.

scwhittle approved these changes Mar 20, 2026

View reviewed changes

scwhittle merged commit 2209bd6 into apache:master Mar 20, 2026
24 of 26 checks passed

		@@ -102,14 +105,16 @@ private Optional<AssembledWorkItem> flushToWorkItem() {
		workItemBuilder.build(),

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