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From lc...@apache.org
Subject [beam] branch master updated: [BEAM-3741] Proto changes for reporting backlog/splitting/finalizing bundles. (#6963)
Date Fri, 09 Nov 2018 17:42:30 GMT
This is an automated email from the ASF dual-hosted git repository.

lcwik pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/beam.git


The following commit(s) were added to refs/heads/master by this push:
     new 17c2da6  [BEAM-3741] Proto changes for reporting backlog/splitting/finalizing bundles.
(#6963)
17c2da6 is described below

commit 17c2da6d981cae9f233aea1e2d6d64259362dd73
Author: Lukasz Cwik <lcwik@google.com>
AuthorDate: Fri Nov 9 09:42:22 2018 -0800

    [BEAM-3741] Proto changes for reporting backlog/splitting/finalizing bundles. (#6963)
    
    * [BEAM-3741] Proto changes for reporting backlog/splitting/finalizing bundles.
    
    This change contains the recommended proto changes from:
    * https://s.apache.org/beam-finalizing-bundles
    * https://s.apache.org/beam-bundles-backlog-splitting
    * https://s.apache.org/beam-checkpoint-and-split-bundles
---
 .../fn-execution/src/main/proto/beam_fn_api.proto  | 176 ++++++++++++++-------
 .../pipeline/src/main/proto/beam_runner_api.proto  |   3 +
 .../portable/RemoteStageEvaluatorFactory.java      |   2 +-
 .../SplittableRemoteStageEvaluatorFactory.java     |  13 +-
 .../direct/portable/ReferenceRunnerTest.java       |   2 +
 .../functions/FlinkExecutableStageFunction.java    |   2 +-
 .../streaming/ExecutableStageDoFnOperator.java     |   2 +-
 .../fnexecution/control/BundleProgressHandler.java |  16 +-
 .../splittabledofn/SDFFeederViaStateAndTimers.java |  41 +++--
 .../fnexecution/control/RemoteExecutionTest.java   |  12 +-
 .../fnexecution/control/SdkHarnessClientTest.java  |   4 +-
 .../harness/SplittableProcessElementsRunner.java   |  20 ++-
 .../fn/harness/control/BundleSplitListener.java    |   6 +-
 .../fn/harness/control/ProcessBundleHandler.java   |  25 ++-
 14 files changed, 188 insertions(+), 136 deletions(-)

diff --git a/model/fn-execution/src/main/proto/beam_fn_api.proto b/model/fn-execution/src/main/proto/beam_fn_api.proto
index 915686d..39229b1 100644
--- a/model/fn-execution/src/main/proto/beam_fn_api.proto
+++ b/model/fn-execution/src/main/proto/beam_fn_api.proto
@@ -119,6 +119,7 @@ message InstructionRequest {
     ProcessBundleRequest process_bundle = 1001;
     ProcessBundleProgressRequest process_bundle_progress = 1002;
     ProcessBundleSplitRequest process_bundle_split = 1003;
+    FinalizeBundleRequest finalize_bundle = 1004;
   }
 }
 
@@ -142,6 +143,7 @@ message InstructionResponse {
     ProcessBundleResponse process_bundle = 1001;
     ProcessBundleProgressResponse process_bundle_progress = 1002;
     ProcessBundleSplitResponse process_bundle_split = 1003;
+    FinalizeBundleResponse finalize_bundle = 1004;
   }
 }
 
@@ -184,55 +186,78 @@ message ProcessBundleDescriptor {
   org.apache.beam.model.pipeline.v1.ApiServiceDescriptor state_api_service_descriptor = 7;
 }
 
-// Represents a partition of the bundle into two bundles: a "primary" and
-// a "residual", with the following properties:
-// - The work in primary and residual doesn't overlap, and combined, adds up
-//   to the work in the current bundle if the split hadn't happened.
-// - The current bundle, if it keeps executing, will have done none of the
-//   work under residual roots.
-// - The current bundle, if no further splits happen, will have done exactly
-//   the work under primary_roots.
-// For more rigorous definitions see https://s.apache.org/beam-breaking-fusion
-message BundleSplit {
-  // One of the root applications specifying the scope of work for a bundle.
-  message Application {
-    // (Required) The primitive transform to which to pass the element
-    string ptransform_id = 1;
+// One of the applications specifying the scope of work for a bundle.
+// See https://docs.google.com/document/d/1tUDb45sStdR8u7-jBkGdw3OGFK7aa2-V7eo86zYSE_4/edit#heading=h.9g3g5weg2u9
for further details.
+message BundleApplication {
+  // (Required) The primitive transform to which to pass the element
+  string ptransform_id = 1;
+
+  // (Required) Name of the transform's input to which to pass the element.
+  string input_id = 2;
 
-    // (Required) Name of the transform's input to which to pass the element.
-    string input_id = 2;
+  // (Required) The encoded element to pass to the transform.
+  bytes element = 3;
 
-    // (Required) The encoded element to pass to the transform.
-    bytes element = 3;
+  // The map is keyed by the local output name of the PTransform. Each
+  // value represents a lower bound on the timestamps of elements that
+  // are produced by this PTransform into each of its output PCollections
+  // when invoked with this application.
+  map<string, google.protobuf.Timestamp> output_watermarks = 4;
 
-    // Approximate lower bounds on timestamps of elements that this PTransform
-    // will produce into each of its output PCollections, when invoked on this
-    // element. Keyed by the transform's local output name.
-    map<string, int64> output_watermarks = 4;
+  // Represents an estimate for the amount of currently outstanding work.
+  message Backlog {
+    // This informs Runners on how to aggregate the backlog
+    // being reported across multiple active bundles. Backlogs
+    // are aggregated using the set of partitions.
+    //
+    // For example SplittableDoFn's which consume elements from:
+    //  * a globally shared resource such as a Pubsub queue should set this
+    //    to “”.
+    //  * a shared partitioned resource should use the partition identifier.
+    //  * a uniquely partitioned resource such as a file range should set this to
+    //    file name + start offset.
+    bytes partition = 1;
+
+    // The estimate for the backlog.
+    oneof value {
+      // Represents an estimate for the amount of outstanding work. Values
+      // compare lexicographically.
+      bytes bytes = 1000;
 
-    // Approximate fraction of all work of the current bundle (before split)
-    // represented by invoking this Application and its downstream applications.
-    // The sum of fraction_of_work between all primary_roots and residual_roots
-    // must add up to approximately 1.0.
-    google.protobuf.DoubleValue fraction_of_work = 5;
+      // Whether the backlog is unknown.
+      bool is_unknown = 1001;
+    }
   }
 
-  // An an Application should be scheduled after a delay.
-  message DelayedApplication {
-    // The delay in seconds (lower bound).
-    double delay_sec = 1;
+  // (Required) An estimate for the amount outstanding work related to
+  // this application.
+  Backlog backlog = 5;
 
-    // (Required) The application that should be scheduled.
-    Application application = 2;
-  }
+  // (Required) Whether this application potentially produces an unbounded
+  // amount of data. Note that this should only be set to BOUNDED if and
+  // only if the application is known to produce a finite amount of output.
+  //
+  // Note that this is different from the backlog as the backlog represents
+  // how much work there is currently outstanding.
+  org.apache.beam.model.pipeline.v1.IsBounded.Enum is_bounded = 6;
 
-  // Root applications that should replace the current bundle.
-  repeated Application primary_roots = 1;
+  // Contains additional monitoring information related to this application.
+  //
+  // Each application is able to report information that some runners
+  // will use consume when providing a UI or for making scaling and performance
+  // decisions. See https://s.apache.org/beam-bundles-backlog-splitting for 
+  // details about what types of signals may be useful to report.
+  repeated MonitoringInfo monitoring_infos = 7;
+}
 
-  // Root applications that have been removed from the current bundle and
-  // have to be executed in a separate bundle (e.g. in parallel on a different
-  // worker, or after the current bundle completes, etc.)
-  repeated DelayedApplication residual_roots = 2;
+// An Application should be scheduled for execution after a delay.
+message DelayedBundleApplication {
+  // Recommended time at which the application should be scheduled to execute
+  // by the runner. Times in the past may be scheduled to execute immediately.
+  google.protobuf.Timestamp requested_execution_time = 1;
+
+  // (Required) The application that should be scheduled.
+  BundleApplication application = 2;
 }
 
 // A request to process a given bundle.
@@ -247,20 +272,25 @@ message ProcessBundleRequest {
   repeated bytes cache_tokens = 2;
 }
 
-// Stable
 message ProcessBundleResponse {
   // (Optional) If metrics reporting is supported by the SDK, this represents
   // the final metrics to record for this bundle.
   // DEPRECATED
   Metrics metrics = 1;
 
-  // (Optional) Specifies that the bundle has been split since the last
-  // ProcessBundleProgressResponse was sent.
-  BundleSplit split = 2;
+  // (Optional) Specifies that the bundle has not been completed and the
+  // following applications need to be scheduled and executed in the future.
+  repeated DelayedBundleApplication residual_roots = 2;
 
   // (Required) The list of metrics or other MonitoredState
   // collected while processing this bundle.
   repeated MonitoringInfo monitoring_infos = 3;
+
+  // (Optional) Specifies that the runner must callback to this worker
+  // once the output of the bundle is committed. The Runner must send a
+  // FinalizeBundleRequest with the instruction id of the ProcessBundleRequest
+  // that is related to this ProcessBundleResponse.
+  bool requires_finalization = 4;
 }
 
 // A request to report progress information for a given bundle.
@@ -310,7 +340,7 @@ message MonitoringInfo {
   map<string, string> labels = 5;
 
   // The walltime of the most recent update.
-  // Useful for aggregation for Latest types such as LatestInt64.
+  // Useful for aggregation for latest types such as LatestInt64.
   google.protobuf.Timestamp timestamp = 6;
 }
 
@@ -573,36 +603,62 @@ message ProcessBundleProgressResponse {
   // DEPRECATED (Required)
   Metrics metrics = 1;
 
-  // (Optional) Specifies that the bundle has been split since the last
-  // ProcessBundleProgressResponse was sent.
-  BundleSplit split = 2;
-
   // (Required) The list of metrics or other MonitoredState
   // collected while processing this bundle.
   repeated MonitoringInfo monitoring_infos = 3;
+
+  // The list of currently active primary roots that are being
+  // executed. Required to be populated for PTransforms which can be split.
+  repeated BundleApplication primary_roots = 4;
 }
 
+// Represents a request to the SDK to split a currently active bundle.
 message ProcessBundleSplitRequest {
   // (Required) A reference to an active process bundle request with the given
   // instruction id.
   string instruction_reference = 1;
 
-  // Specifies that the runner would like the bundle to split itself using
-  // BundleSplit, and give up some of the work that the bundle hasn't started
-  // doing yet, so that it can be done in a separate bundle (perhaps in
-  // parallel with the current bundle).
+  // (Required) Specifies that the Runner would like the bundle to split itself
+  // such that it performs no more work than the backlog specified for each
+  // PTransform. The interpretation of how much work should be processed is up
+  // to the PTransform.
   //
-  // The value is the fraction of unstarted work to keep. E.g. 0 means give up
-  // as much as possible of unstarted work (e.g. checkpoint), 0.5 means give
-  // up about half of the unstarted work, etc.
-  // This is a hint and the value is approximate.
+  // For example, A backlog of "" tells the SDK to perform as little work as
+  // possible, effectively checkpointing when able. The remaining backlog
+  // will be relative to the backlog reported during processing.
   //
-  // The value is relative to the current scope of work of the bundle.
-  google.protobuf.DoubleValue fraction_of_remainder = 2;
+  // If the backlog is unspecified for a PTransform, the runner would like 
+  // the SDK to process all data received for that PTransform.
+  map<string, bytes> backlog_remaining = 2;
 }
 
+// Represents a partition of the bundle: a "primary" and
+// a "residual", with the following properties:
+// - The work in primary and residual doesn't overlap, and combined, adds up
+//   to the work in the current bundle if the split hadn't happened.
+// - The current bundle, if it keeps executing, will have done none of the
+//   work under residual_roots.
+// - The current bundle, if no further splits happen, will have done exactly
+//   the work under primary_roots.
+// For more rigorous definitions see https://s.apache.org/beam-breaking-fusion
 message ProcessBundleSplitResponse {
-  // Empty.
+  // Root applications that should replace the current bundle.
+  repeated BundleApplication primary_roots = 1;
+
+  // Root applications that have been removed from the current bundle and
+  // have to be executed in a separate bundle (e.g. in parallel on a different
+  // worker, or after the current bundle completes, etc.)
+  repeated DelayedBundleApplication residual_roots = 2;
+}
+
+message FinalizeBundleRequest {
+  // (Required) A reference to a completed process bundle request with the given
+  // instruction id.
+  string instruction_reference = 1;
+}
+
+message FinalizeBundleResponse {
+  // Empty
 }
 
 /*
diff --git a/model/pipeline/src/main/proto/beam_runner_api.proto b/model/pipeline/src/main/proto/beam_runner_api.proto
index 4b537b0..cbf3941 100644
--- a/model/pipeline/src/main/proto/beam_runner_api.proto
+++ b/model/pipeline/src/main/proto/beam_runner_api.proto
@@ -462,6 +462,9 @@ message ParDoPayload {
 
   // (Required if splittable == true) Id of the restriction coder.
   string restriction_coder_id = 7;
+
+  // (Optional) Only set when this ParDo can request bundle finalization.
+  bool requests_finalization = 8;
 }
 
 // Parameters that a UDF might require.
diff --git a/runners/direct-java/src/main/java/org/apache/beam/runners/direct/portable/RemoteStageEvaluatorFactory.java
b/runners/direct-java/src/main/java/org/apache/beam/runners/direct/portable/RemoteStageEvaluatorFactory.java
index 7089576..fd42f2f 100644
--- a/runners/direct-java/src/main/java/org/apache/beam/runners/direct/portable/RemoteStageEvaluatorFactory.java
+++ b/runners/direct-java/src/main/java/org/apache/beam/runners/direct/portable/RemoteStageEvaluatorFactory.java
@@ -76,7 +76,7 @@ class RemoteStageEvaluatorFactory implements TransformEvaluatorFactory {
               BundleFactoryOutputReceiverFactory.create(
                   bundleFactory, stage.getComponents(), outputs::add),
               StateRequestHandler.unsupported(),
-              BundleProgressHandler.unsupported());
+              BundleProgressHandler.ignored());
       // TODO(BEAM-4680): Add support for timers as inputs to the ULR
       this.mainInput = Iterables.getOnlyElement(bundle.getInputReceivers().values());
     }
diff --git a/runners/direct-java/src/main/java/org/apache/beam/runners/direct/portable/SplittableRemoteStageEvaluatorFactory.java
b/runners/direct-java/src/main/java/org/apache/beam/runners/direct/portable/SplittableRemoteStageEvaluatorFactory.java
index 88fcae1..2993d23 100644
--- a/runners/direct-java/src/main/java/org/apache/beam/runners/direct/portable/SplittableRemoteStageEvaluatorFactory.java
+++ b/runners/direct-java/src/main/java/org/apache/beam/runners/direct/portable/SplittableRemoteStageEvaluatorFactory.java
@@ -130,20 +130,13 @@ class SplittableRemoteStageEvaluatorFactory implements TransformEvaluatorFactory
                   BundleFactoryOutputReceiverFactory.create(
                       bundleFactory, stage.getComponents(), outputs::add),
                   StateRequestHandler.unsupported(),
+                  // TODO: Wire in splitting via a split listener
                   new BundleProgressHandler() {
                     @Override
-                    public void onProgress(ProcessBundleProgressResponse progress) {
-                      if (progress.hasSplit()) {
-                        feeder.split(progress.getSplit());
-                      }
-                    }
+                    public void onProgress(ProcessBundleProgressResponse progress) {}
 
                     @Override
-                    public void onCompleted(ProcessBundleResponse response) {
-                      if (response.hasSplit()) {
-                        feeder.split(response.getSplit());
-                      }
-                    }
+                    public void onCompleted(ProcessBundleResponse response) {}
                   });
       this.mainInput = Iterables.getOnlyElement(bundle.getInputReceivers().values());
     }
diff --git a/runners/direct-java/src/test/java/org/apache/beam/runners/direct/portable/ReferenceRunnerTest.java
b/runners/direct-java/src/test/java/org/apache/beam/runners/direct/portable/ReferenceRunnerTest.java
index 9b5e762..fe6dd9c 100644
--- a/runners/direct-java/src/test/java/org/apache/beam/runners/direct/portable/ReferenceRunnerTest.java
+++ b/runners/direct-java/src/test/java/org/apache/beam/runners/direct/portable/ReferenceRunnerTest.java
@@ -57,6 +57,7 @@ import org.apache.beam.sdk.values.TupleTag;
 import org.apache.beam.sdk.values.TupleTagList;
 import org.joda.time.Duration;
 import org.joda.time.Instant;
+import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
@@ -176,6 +177,7 @@ public class ReferenceRunnerTest implements Serializable {
   }
 
   @Test
+  @Ignore("TODO: BEAM-3743")
   public void testSDF() throws Exception {
     Pipeline p = Pipeline.create();
 
diff --git a/runners/flink/src/main/java/org/apache/beam/runners/flink/translation/functions/FlinkExecutableStageFunction.java
b/runners/flink/src/main/java/org/apache/beam/runners/flink/translation/functions/FlinkExecutableStageFunction.java
index 51acb84..17b7e53 100644
--- a/runners/flink/src/main/java/org/apache/beam/runners/flink/translation/functions/FlinkExecutableStageFunction.java
+++ b/runners/flink/src/main/java/org/apache/beam/runners/flink/translation/functions/FlinkExecutableStageFunction.java
@@ -125,7 +125,7 @@ public class FlinkExecutableStageFunction<InputT> extends AbstractRichFunction
     stateRequestHandler =
         getStateRequestHandler(
             executableStage, stageBundleFactory.getProcessBundleDescriptor(), runtimeContext);
-    progressHandler = BundleProgressHandler.unsupported();
+    progressHandler = BundleProgressHandler.ignored();
   }
 
   private StateRequestHandler getStateRequestHandler(
diff --git a/runners/flink/src/main/java/org/apache/beam/runners/flink/translation/wrappers/streaming/ExecutableStageDoFnOperator.java
b/runners/flink/src/main/java/org/apache/beam/runners/flink/translation/wrappers/streaming/ExecutableStageDoFnOperator.java
index 5df0845..eb64611 100644
--- a/runners/flink/src/main/java/org/apache/beam/runners/flink/translation/wrappers/streaming/ExecutableStageDoFnOperator.java
+++ b/runners/flink/src/main/java/org/apache/beam/runners/flink/translation/wrappers/streaming/ExecutableStageDoFnOperator.java
@@ -151,7 +151,7 @@ public class ExecutableStageDoFnOperator<InputT, OutputT> extends
DoFnOperator<I
 
     stageBundleFactory = stageContext.getStageBundleFactory(executableStage);
     stateRequestHandler = getStateRequestHandler(executableStage);
-    progressHandler = BundleProgressHandler.unsupported();
+    progressHandler = BundleProgressHandler.ignored();
     outputQueue = new LinkedBlockingQueue<>();
   }
 
diff --git a/runners/java-fn-execution/src/main/java/org/apache/beam/runners/fnexecution/control/BundleProgressHandler.java
b/runners/java-fn-execution/src/main/java/org/apache/beam/runners/fnexecution/control/BundleProgressHandler.java
index bc7ca38..5846bdf 100644
--- a/runners/java-fn-execution/src/main/java/org/apache/beam/runners/fnexecution/control/BundleProgressHandler.java
+++ b/runners/java-fn-execution/src/main/java/org/apache/beam/runners/fnexecution/control/BundleProgressHandler.java
@@ -33,22 +33,14 @@ public interface BundleProgressHandler {
   /** Handles the bundle's completion report. */
   void onCompleted(ProcessBundleResponse response);
 
-  /** Returns a handler that ignores metrics and throws on splits (as splits can not be ignored).
*/
-  static BundleProgressHandler unsupported() {
+  /** Returns a handler that ignores metrics. */
+  static BundleProgressHandler ignored() {
     return new BundleProgressHandler() {
       @Override
-      public void onProgress(ProcessBundleProgressResponse progress) {
-        if (progress.hasSplit()) {
-          throw new UnsupportedOperationException("Splitting not yet supported");
-        }
-      }
+      public void onProgress(ProcessBundleProgressResponse progress) {}
 
       @Override
-      public void onCompleted(ProcessBundleResponse response) {
-        if (response.hasSplit()) {
-          throw new UnsupportedOperationException("Splitting not yet supported");
-        }
-      }
+      public void onCompleted(ProcessBundleResponse response) {}
     };
   }
 }
diff --git a/runners/java-fn-execution/src/main/java/org/apache/beam/runners/fnexecution/splittabledofn/SDFFeederViaStateAndTimers.java
b/runners/java-fn-execution/src/main/java/org/apache/beam/runners/fnexecution/splittabledofn/SDFFeederViaStateAndTimers.java
index d1d67a0..deef29a 100644
--- a/runners/java-fn-execution/src/main/java/org/apache/beam/runners/fnexecution/splittabledofn/SDFFeederViaStateAndTimers.java
+++ b/runners/java-fn-execution/src/main/java/org/apache/beam/runners/fnexecution/splittabledofn/SDFFeederViaStateAndTimers.java
@@ -23,8 +23,8 @@ import static com.google.common.base.Preconditions.checkState;
 import com.google.common.collect.Iterables;
 import java.io.IOException;
 import java.util.List;
-import org.apache.beam.model.fnexecution.v1.BeamFnApi.BundleSplit;
-import org.apache.beam.model.fnexecution.v1.BeamFnApi.BundleSplit.DelayedApplication;
+import org.apache.beam.model.fnexecution.v1.BeamFnApi.BundleApplication;
+import org.apache.beam.model.fnexecution.v1.BeamFnApi.DelayedBundleApplication;
 import org.apache.beam.runners.core.StateInternals;
 import org.apache.beam.runners.core.StateNamespace;
 import org.apache.beam.runners.core.StateNamespaces;
@@ -45,7 +45,7 @@ import org.apache.beam.sdk.util.WindowedValue;
 import org.apache.beam.sdk.util.WindowedValue.FullWindowedValueCoder;
 import org.apache.beam.sdk.values.KV;
 import org.apache.beam.vendor.protobuf.v3.com.google.protobuf.ByteString;
-import org.joda.time.Duration;
+import org.apache.beam.vendor.protobuf.v3.com.google.protobuf.util.Timestamps;
 import org.joda.time.Instant;
 
 /**
@@ -76,7 +76,8 @@ public class SDFFeederViaStateAndTimers<InputT, RestrictionT> {
   private WatermarkHoldState holdState;
 
   private Instant inputTimestamp;
-  private BundleSplit split;
+  private List<BundleApplication> primaryRoots;
+  private List<DelayedBundleApplication> residualRoots;
 
   /** Initializes the feeder. */
   public SDFFeederViaStateAndTimers(
@@ -119,7 +120,7 @@ public class SDFFeederViaStateAndTimers<InputT, RestrictionT> {
    * and sets a wake-up timer if a checkpoint happened.
    */
   public void commit() throws IOException {
-    if (split == null) {
+    if (primaryRoots == null) {
       // No split - the call terminated.
       seedState.clear();
       restrictionState.clear();
@@ -128,9 +129,8 @@ public class SDFFeederViaStateAndTimers<InputT, RestrictionT> {
     }
 
     // For now can only happen on the first instruction which is SPLITTABLE_PROCESS_ELEMENTS.
-    List<DelayedApplication> residuals = split.getResidualRootsList();
-    checkArgument(residuals.size() == 1, "More than 1 residual is unsupported for now");
-    DelayedApplication residual = residuals.get(0);
+    checkArgument(residualRoots.size() == 1, "More than 1 residual is unsupported for now");
+    DelayedBundleApplication residual = residualRoots.get(0);
 
     ByteString encodedResidual = residual.getApplication().getElement();
     WindowedValue<KV<InputT, RestrictionT>> decodedResidual =
@@ -151,8 +151,12 @@ public class SDFFeederViaStateAndTimers<InputT, RestrictionT> {
         inputTimestamp);
     holdState.add(watermarkHold);
 
-    Duration resumeDelay = Duration.millis((long) (1000L * residual.getDelaySec()));
-    Instant wakeupTime = timerInternals.currentProcessingTime().plus(resumeDelay);
+    Instant requestedWakeupTime =
+        new Instant(Timestamps.toMillis(residual.getRequestedExecutionTime()));
+    Instant wakeupTime =
+        timerInternals.currentProcessingTime().isBefore(requestedWakeupTime)
+            ? requestedWakeupTime
+            : timerInternals.currentProcessingTime();
 
     // Set a timer to continue processing this element.
     timerInternals.setTimer(
@@ -160,13 +164,18 @@ public class SDFFeederViaStateAndTimers<InputT, RestrictionT>
{
   }
 
   /** Signals that a split happened. */
-  public void split(BundleSplit split) {
+  public void split(
+      List<BundleApplication> primaryRoots, List<DelayedBundleApplication> residualRoots)
{
     checkState(
-        this.split == null,
-        "At most 1 split supported, however got new split %s in addition to existing %s",
-        split,
-        this.split);
-    this.split = split;
+        this.primaryRoots == null,
+        "At most 1 split supported, however got new split (%s, %s) "
+            + "in addition to existing (%s, %s)",
+        primaryRoots,
+        residualRoots,
+        this.primaryRoots,
+        this.residualRoots);
+    this.primaryRoots = primaryRoots;
+    this.residualRoots = residualRoots;
   }
 
   private void initState(StateNamespace ns) {
diff --git a/runners/java-fn-execution/src/test/java/org/apache/beam/runners/fnexecution/control/RemoteExecutionTest.java
b/runners/java-fn-execution/src/test/java/org/apache/beam/runners/fnexecution/control/RemoteExecutionTest.java
index 3bbe04e..69a604f 100644
--- a/runners/java-fn-execution/src/test/java/org/apache/beam/runners/fnexecution/control/RemoteExecutionTest.java
+++ b/runners/java-fn-execution/src/test/java/org/apache/beam/runners/fnexecution/control/RemoteExecutionTest.java
@@ -263,7 +263,7 @@ public class RemoteExecutionTest implements Serializable {
     // The impulse example
 
     try (ActiveBundle bundle =
-        processor.newBundle(outputReceivers, BundleProgressHandler.unsupported())) {
+        processor.newBundle(outputReceivers, BundleProgressHandler.ignored())) {
       Iterables.getOnlyElement(bundle.getInputReceivers().values())
           .accept(WindowedValue.valueInGlobalWindow(new byte[0]));
     }
@@ -374,7 +374,7 @@ public class RemoteExecutionTest implements Serializable {
                 };
               }
             });
-    BundleProgressHandler progressHandler = BundleProgressHandler.unsupported();
+    BundleProgressHandler progressHandler = BundleProgressHandler.ignored();
 
     try (ActiveBundle bundle =
         processor.newBundle(outputReceivers, stateRequestHandler, progressHandler)) {
@@ -528,7 +528,7 @@ public class RemoteExecutionTest implements Serializable {
 
     try (ActiveBundle bundle =
         processor.newBundle(
-            outputReceivers, stateRequestHandler, BundleProgressHandler.unsupported())) {
+            outputReceivers, stateRequestHandler, BundleProgressHandler.ignored())) {
       Iterables.getOnlyElement(bundle.getInputReceivers().values())
           .accept(WindowedValue.valueInGlobalWindow(kvBytes("X", "Y")));
     }
@@ -671,9 +671,7 @@ public class RemoteExecutionTest implements Serializable {
 
     try (ActiveBundle bundle =
         processor.newBundle(
-            outputReceivers,
-            StateRequestHandler.unsupported(),
-            BundleProgressHandler.unsupported())) {
+            outputReceivers, StateRequestHandler.unsupported(), BundleProgressHandler.ignored()))
{
       bundle
           .getInputReceivers()
           .get(stage.getInputPCollection().getId())
@@ -794,7 +792,7 @@ public class RemoteExecutionTest implements Serializable {
           processor.newBundle(
               outputReceivers,
               StateRequestHandler.unsupported(),
-              BundleProgressHandler.unsupported())) {
+              BundleProgressHandler.ignored())) {
         bundle
             .getInputReceivers()
             .get(stage.getInputPCollection().getId())
diff --git a/runners/java-fn-execution/src/test/java/org/apache/beam/runners/fnexecution/control/SdkHarnessClientTest.java
b/runners/java-fn-execution/src/test/java/org/apache/beam/runners/fnexecution/control/SdkHarnessClientTest.java
index 82b734c..f875b78 100644
--- a/runners/java-fn-execution/src/test/java/org/apache/beam/runners/fnexecution/control/SdkHarnessClientTest.java
+++ b/runners/java-fn-execution/src/test/java/org/apache/beam/runners/fnexecution/control/SdkHarnessClientTest.java
@@ -236,7 +236,7 @@ public class SdkHarnessClientTest {
     when(dataService.send(any(), eq(coder))).thenReturn(mock(CloseableFnDataReceiver.class));
 
     try (ActiveBundle activeBundle =
-        processor.newBundle(Collections.emptyMap(), BundleProgressHandler.unsupported()))
{
+        processor.newBundle(Collections.emptyMap(), BundleProgressHandler.ignored())) {
       // Correlating the ProcessBundleRequest and ProcessBundleResponse is owned by the underlying
       // FnApiControlClient. The SdkHarnessClient owns just wrapping the request and unwrapping
       // the response.
@@ -271,7 +271,7 @@ public class SdkHarnessClientTest {
                     FullWindowedValueCoder.of(
                         LengthPrefixCoder.of(StringUtf8Coder.of()), Coder.INSTANCE),
                     outputs::add)),
-            BundleProgressHandler.unsupported())) {
+            BundleProgressHandler.ignored())) {
       FnDataReceiver<WindowedValue<?>> bundleInputReceiver =
           Iterables.getOnlyElement(activeBundle.getInputReceivers().values());
       bundleInputReceiver.accept(WindowedValue.valueInGlobalWindow("foo"));
diff --git a/sdks/java/harness/src/main/java/org/apache/beam/fn/harness/SplittableProcessElementsRunner.java
b/sdks/java/harness/src/main/java/org/apache/beam/fn/harness/SplittableProcessElementsRunner.java
index 6ade4bb..92a966f 100644
--- a/sdks/java/harness/src/main/java/org/apache/beam/fn/harness/SplittableProcessElementsRunner.java
+++ b/sdks/java/harness/src/main/java/org/apache/beam/fn/harness/SplittableProcessElementsRunner.java
@@ -30,8 +30,8 @@ import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import org.apache.beam.fn.harness.DoFnPTransformRunnerFactory.Context;
 import org.apache.beam.fn.harness.state.FnApiStateAccessor;
-import org.apache.beam.model.fnexecution.v1.BeamFnApi.BundleSplit.Application;
-import org.apache.beam.model.fnexecution.v1.BeamFnApi.BundleSplit.DelayedApplication;
+import org.apache.beam.model.fnexecution.v1.BeamFnApi.BundleApplication;
+import org.apache.beam.model.fnexecution.v1.BeamFnApi.DelayedBundleApplication;
 import org.apache.beam.runners.core.OutputAndTimeBoundedSplittableProcessElementInvoker;
 import org.apache.beam.runners.core.OutputWindowedValue;
 import org.apache.beam.runners.core.SplittableProcessElementInvoker;
@@ -53,6 +53,7 @@ import org.apache.beam.sdk.util.WindowedValue.FullWindowedValueCoder;
 import org.apache.beam.sdk.values.KV;
 import org.apache.beam.sdk.values.TupleTag;
 import org.apache.beam.vendor.protobuf.v3.com.google.protobuf.ByteString;
+import org.apache.beam.vendor.protobuf.v3.com.google.protobuf.util.Timestamps;
 import org.joda.time.Duration;
 import org.joda.time.Instant;
 
@@ -227,14 +228,14 @@ public class SplittableProcessElementsRunner<InputT, RestrictionT,
OutputT>
       } catch (IOException e) {
         throw new RuntimeException(e);
       }
-      Application primaryApplication =
-          Application.newBuilder()
+      BundleApplication primaryApplication =
+          BundleApplication.newBuilder()
               .setPtransformId(context.ptransformId)
               .setInputId(mainInputId)
               .setElement(primaryBytes.toByteString())
               .build();
-      Application residualApplication =
-          Application.newBuilder()
+      BundleApplication residualApplication =
+          BundleApplication.newBuilder()
               .setPtransformId(context.ptransformId)
               .setInputId(mainInputId)
               .setElement(residualBytes.toByteString())
@@ -242,9 +243,12 @@ public class SplittableProcessElementsRunner<InputT, RestrictionT,
OutputT>
       context.splitListener.split(
           ImmutableList.of(primaryApplication),
           ImmutableList.of(
-              DelayedApplication.newBuilder()
+              DelayedBundleApplication.newBuilder()
                   .setApplication(residualApplication)
-                  .setDelaySec(0.001 * result.getContinuation().resumeDelay().getMillis())
+                  .setRequestedExecutionTime(
+                      Timestamps.fromMillis(
+                          System.currentTimeMillis()
+                              + result.getContinuation().resumeDelay().getMillis()))
                   .build()));
     }
   }
diff --git a/sdks/java/harness/src/main/java/org/apache/beam/fn/harness/control/BundleSplitListener.java
b/sdks/java/harness/src/main/java/org/apache/beam/fn/harness/control/BundleSplitListener.java
index 5e6ba70..9eab245 100644
--- a/sdks/java/harness/src/main/java/org/apache/beam/fn/harness/control/BundleSplitListener.java
+++ b/sdks/java/harness/src/main/java/org/apache/beam/fn/harness/control/BundleSplitListener.java
@@ -18,8 +18,8 @@
 package org.apache.beam.fn.harness.control;
 
 import java.util.List;
-import org.apache.beam.model.fnexecution.v1.BeamFnApi.BundleSplit.Application;
-import org.apache.beam.model.fnexecution.v1.BeamFnApi.BundleSplit.DelayedApplication;
+import org.apache.beam.model.fnexecution.v1.BeamFnApi.BundleApplication;
+import org.apache.beam.model.fnexecution.v1.BeamFnApi.DelayedBundleApplication;
 
 /**
  * Listens to splits happening to a single bundle. See <a
@@ -36,5 +36,5 @@ public interface BundleSplitListener {
    * are a decomposition of work that has been given away by the bundle, so the runner must
delegate
    * it for someone else to execute.
    */
-  void split(List<Application> primaryRoots, List<DelayedApplication> residualRoots);
+  void split(List<BundleApplication> primaryRoots, List<DelayedBundleApplication>
residualRoots);
 }
diff --git a/sdks/java/harness/src/main/java/org/apache/beam/fn/harness/control/ProcessBundleHandler.java
b/sdks/java/harness/src/main/java/org/apache/beam/fn/harness/control/ProcessBundleHandler.java
index 9b9ed6c..547a859 100644
--- a/sdks/java/harness/src/main/java/org/apache/beam/fn/harness/control/ProcessBundleHandler.java
+++ b/sdks/java/harness/src/main/java/org/apache/beam/fn/harness/control/ProcessBundleHandler.java
@@ -44,9 +44,8 @@ import org.apache.beam.fn.harness.data.BeamFnDataClient;
 import org.apache.beam.fn.harness.state.BeamFnStateClient;
 import org.apache.beam.fn.harness.state.BeamFnStateGrpcClientCache;
 import org.apache.beam.model.fnexecution.v1.BeamFnApi;
-import org.apache.beam.model.fnexecution.v1.BeamFnApi.BundleSplit;
-import org.apache.beam.model.fnexecution.v1.BeamFnApi.BundleSplit.Application;
-import org.apache.beam.model.fnexecution.v1.BeamFnApi.BundleSplit.DelayedApplication;
+import org.apache.beam.model.fnexecution.v1.BeamFnApi.BundleApplication;
+import org.apache.beam.model.fnexecution.v1.BeamFnApi.DelayedBundleApplication;
 import org.apache.beam.model.fnexecution.v1.BeamFnApi.ProcessBundleDescriptor;
 import org.apache.beam.model.fnexecution.v1.BeamFnApi.ProcessBundleRequest;
 import org.apache.beam.model.fnexecution.v1.BeamFnApi.ProcessBundleResponse;
@@ -236,19 +235,19 @@ public class ProcessBundleHandler {
                 beamFnStateGrpcClientCache.forApiServiceDescriptor(
                     bundleDescriptor.getStateApiServiceDescriptor()))
             : new FailAllStateCallsForBundle(request.getProcessBundle())) {
-      Multimap<String, Application> allPrimaries = ArrayListMultimap.create();
-      Multimap<String, DelayedApplication> allResiduals = ArrayListMultimap.create();
+      Multimap<String, BundleApplication> allPrimaries = ArrayListMultimap.create();
+      Multimap<String, DelayedBundleApplication> allResiduals = ArrayListMultimap.create();
       BundleSplitListener splitListener =
-          (List<Application> primaries, List<DelayedApplication> residuals) ->
{
+          (List<BundleApplication> primaries, List<DelayedBundleApplication>
residuals) -> {
             // Reset primaries and accumulate residuals.
-            Multimap<String, Application> newPrimaries = ArrayListMultimap.create();
-            for (Application primary : primaries) {
+            Multimap<String, BundleApplication> newPrimaries = ArrayListMultimap.create();
+            for (BundleApplication primary : primaries) {
               newPrimaries.put(primary.getPtransformId(), primary);
             }
             allPrimaries.clear();
             allPrimaries.putAll(newPrimaries);
 
-            for (DelayedApplication residual : residuals) {
+            for (DelayedBundleApplication residual : residuals) {
               allResiduals.put(residual.getApplication().getPtransformId(), residual);
             }
           };
@@ -290,12 +289,8 @@ public class ProcessBundleHandler {
         LOG.debug("Finishing function {}", finishFunction);
         finishFunction.run();
       }
-      if (!allPrimaries.isEmpty()) {
-        response.setSplit(
-            BundleSplit.newBuilder()
-                .addAllPrimaryRoots(allPrimaries.values())
-                .addAllResidualRoots(allResiduals.values())
-                .build());
+      if (!allResiduals.isEmpty()) {
+        response.addAllResidualRoots(allResiduals.values());
       }
     }
 


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