Do not create new Executor everytime createRunner by Abacn · Pull Request #32272 · apache/beam

Abacn · 2024-08-21T18:52:06Z

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Abacn · 2024-08-21T18:53:10Z

...worker/src/main/java/org/apache/beam/runners/dataflow/worker/SplittableProcessFnFactory.java

        OutputManager outputManager,
        DoFnSchemaInformation doFnSchemaInformation,
        Map<String, PCollectionView<?>> sideInputMapping) {
+      if (this.ses == null) {


added debug log in both branch and run a sample job, saw

INFO 2024-08-21T18:47:53.569Z creating new sdf executor INFO 2024-08-21T18:47:55.698Z Reuse old sdf executor INFO 2024-08-21T18:47:56.812Z Reuse old sdf executor INFO 2024-08-21T18:47:57.919Z Reuse old sdf executor INFO 2024-08-21T18:47:59.030Z Reuse old sdf executor INFO 2024-08-21T18:48:00.138Z Reuse old sdf executor INFO 2024-08-21T18:48:00.699Z Reuse old sdf executor INFO 2024-08-21T18:48:01.871Z Reuse old sdf executor INFO 2024-08-21T18:48:03.044Z Reuse old sdf executor INFO 2024-08-21T18:48:04.121Z Reuse old sdf executor INFO 2024-08-21T18:48:04.715Z Reuse old sdf executor INFO 2024-08-21T18:48:05.821Z Reuse old sdf executor ...

indicating this change is effective

Abacn · 2024-08-21T19:06:25Z

internal tracker: 361080602

example dataflow job

before: 2024-08-21_11_14_45-8135795605757551727

memory usage increasing overtime (will ultimately OOM due to thread leak)

after: 2024-08-21_11_39_15-12114433774010769671

memory usage is flat

Abacn · 2024-08-21T19:09:23Z

R: @scwhittle

github-actions · 2024-08-21T19:10:37Z

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Abacn · 2024-08-21T19:14:52Z

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github-actions · 2024-08-21T19:16:08Z

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scwhittle · 2024-08-21T19:16:14Z

...worker/src/main/java/org/apache/beam/runners/dataflow/worker/SplittableProcessFnFactory.java

        Map<String, PCollectionView<?>> sideInputMapping) {
+      if (this.ses == null) {
+        this.ses =
+            Executors.newSingleThreadScheduledExecutor(


I don't think we want a single threaded one here, because I believe the factory vends many different dofnrunner which will want some parallel threads for splits.

changed to use Executors.newScheduledThreadPool

scwhittle · 2024-08-21T19:17:25Z

...worker/src/main/java/org/apache/beam/runners/dataflow/worker/SplittableProcessFnFactory.java

        OutputManager outputManager,
        DoFnSchemaInformation doFnSchemaInformation,
        Map<String, PCollectionView<?>> sideInputMapping) {
+      if (this.ses == null) {


if this factory possibly called concurrently? might need some synchronization if so?

I am not sure but now guard with AtomicReference

scwhittle · 2024-08-21T19:18:22Z

...c/main/java/org/apache/beam/runners/samza/runtime/SplittableParDoProcessKeyedElementsOp.java


+    if (this.ses == null) {
+      this.ses =
+          Executors.newSingleThreadScheduledExecutor(


not yet using this below

fixed the mistake

...ava/org/apache/beam/runners/flink/translation/wrappers/streaming/SplittableDoFnOperator.java

...c/main/java/org/apache/beam/runners/samza/runtime/SplittableParDoProcessKeyedElementsOp.java

scwhittle

Thanks for fixing these!

scwhittle · 2024-08-21T20:39:36Z

...worker/src/main/java/org/apache/beam/runners/dataflow/worker/SplittableProcessFnFactory.java

        OutputManager outputManager,
        DoFnSchemaInformation doFnSchemaInformation,
        Map<String, PCollectionView<?>> sideInputMapping) {
+      if (this.ses.get() == null) {


remembered a cleaner way to do this:

private final Supplier sesSupplier =
Suppliers.memoize(
() -> Executors.newScheduledThreadPool(
Runtime.getRuntime().availableProcessors(),
new ThreadFactoryBuilder().setNameFormat("df-sdf-executor-%d").build())));

and then just ses.get() below

thanks, good to learn, for now merging it before release cut

* Do not create new Executor everytime createRunner * reset executorService after shutdown * Switch to use newScheduledThreadPool; guard ses with AtomicReference * Partially revert changes on flink and samza runner

Do not create new Executor everytime createRunner

f6ad68f

github-actions bot added runners dataflow flink samza labels Aug 21, 2024

Abacn commented Aug 21, 2024

View reviewed changes

reset executorService after shutdown

443e38e

github-actions bot added the Next Action: Reviewers label Aug 21, 2024

scwhittle requested changes Aug 21, 2024

View reviewed changes

Abacn force-pushed the reuseexec branch from ed9338c to 3660a9d Compare August 21, 2024 19:52

Switch to use newScheduledThreadPool; guard ses with AtomicReference

d55a68e

Abacn force-pushed the reuseexec branch from 3660a9d to d55a68e Compare August 21, 2024 19:59

scwhittle requested changes Aug 21, 2024

View reviewed changes

...ava/org/apache/beam/runners/flink/translation/wrappers/streaming/SplittableDoFnOperator.java Outdated Show resolved Hide resolved

...c/main/java/org/apache/beam/runners/samza/runtime/SplittableParDoProcessKeyedElementsOp.java Outdated Show resolved Hide resolved

Partially revert changes on flink and samza runner

3b08a1f

scwhittle approved these changes Aug 21, 2024

View reviewed changes

Abacn merged commit ed4c03e into apache:master Aug 21, 2024

Abacn deleted the reuseexec branch August 21, 2024 21:08

lostluck added this to the 2.59.0 Release milestone Aug 27, 2024

Abacn mentioned this pull request Aug 7, 2025

Reenable prism as default #35621

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Abacn commented Aug 21, 2024

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Abacn commented Aug 21, 2024 •

edited

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