m-trieu commented on code in PR #34053:
URL: https://github.com/apache/beam/pull/34053#discussion_r2023608495
##########
runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/streaming/harness/BackendWorkerMetadataVendor.java:
##########
@@ -75,69 +81,77 @@ static BackendWorkerMetadataVendor create(
* Returns a {@link CompletableFuture} that can be used to block until the
initial {@link
* GetWorkerMetadataStream} has been started.
*/
- CompletableFuture<Void> start(Consumer<WindmillEndpoints> endpointsConsumer)
{
- if (isRunning.compareAndSet(false, true)) {
- LOG.debug("Starting WorkerMetadataVendor...");
-
- CountDownLatch initialStreamStarted = new CountDownLatch(1);
-
- workerMetadataFetcher.execute(
- () -> {
- boolean isInitialWorkerMetadata = true;
- WorkerMetadataResponse initialWorkerMetadata = NO_WORKER_METADATA;
-
- while (isRunning.get()) {
- GetWorkerMetadataStream getWorkerMetadataStream =
- getWorkerMetadataStreamFactory.create(initialWorkerMetadata,
endpointsConsumer);
- LOG.debug(
- "Starting GetWorkerMetadataStream w/ metadata version {}.",
- initialWorkerMetadata.getMetadataVersion());
- getWorkerMetadataStream.start();
-
- if (isInitialWorkerMetadata) {
- isInitialWorkerMetadata = false;
- initialStreamStarted.countDown();
+ synchronized void start(Consumer<WindmillEndpoints> endpointsConsumer) {
+ checkState(!isStarted, "Multiple calls to
BackendWorkerMetadataVendor.start() is not allowed.");
+ checkState(!isShutdown, "BackendWorkerMetadataVendor has previously been
shutdown.");
+ LOG.debug("Starting WorkerMetadataVendor...");
+
+ fetchBackendWorkerMetadataExecutor.execute(
+ () -> {
+ WorkerMetadataResponse initialWorkerMetadata = NO_WORKER_METADATA;
+
+ while (isStarted && !isShutdown) {
+ GetWorkerMetadataStream getWorkerMetadataStream =
+ getWorkerMetadataStreamFactory.create(initialWorkerMetadata,
endpointsConsumer);
+ LOG.debug(
+ "Starting GetWorkerMetadataStream w/ metadata version {}.",
+ initialWorkerMetadata.getMetadataVersion());
+ getWorkerMetadataStream.start();
+ initialStreamStarted.countDown();
+
+ // Await stream termination and propagate the most current worker
metadata to start
+ // the next stream.
+ try {
+ initialWorkerMetadata =
awaitGracefulTermination(getWorkerMetadataStream);
+ } catch (InterruptedException e) {
+ if (isShutdown) {
+ break;
}
- // Await stream termination and propagate the most current
worker metadata to start
- // the next stream.
- initialWorkerMetadata =
awaitGracefulTermination(getWorkerMetadataStream);
- LOG.debug(
- "Current GetWorkerMetadataStream terminated. Propagating
metadata version {} to the next stream.",
- initialWorkerMetadata.getMetadataVersion());
+ throw new IllegalStateException(
+ "BackendWorkerMetadataVendor interrupted unexpectedly.", e);
}
- });
- return CompletableFuture.runAsync(
- () -> {
- int secondsWaited = 0;
- try {
- while (!initialStreamStarted.await(10, TimeUnit.SECONDS) &&
isRunning.get()) {
- secondsWaited += 10;
- LOG.debug(
- "Waited {} seconds for initial GetWorkerMetadataStream to
start.",
- secondsWaited);
- }
- } catch (InterruptedException e) {
- LOG.debug("Interrupted waiting for initial
GetWorkerMetadataStream to start.");
- Thread.currentThread().interrupt();
- }
- },
- // Run this on the calling thread.
- MoreExecutors.directExecutor());
- }
+ LOG.debug(
+ "Current GetWorkerMetadataStream terminated. Propagating
metadata version {} to the next stream.",
+ initialWorkerMetadata.getMetadataVersion());
+ }
+
+ LOG.info("BackendWorkerMetadata vending complete.");
+ });
- return CompletableFuture.completedFuture(null);
+ isStarted = true;
}
- void stop() {
- if (isRunning.compareAndSet(true, false)) {
+ /**
+ * Wait for the initial backend worker metadata stream to start.
+ *
+ * @implNote Blocks the calling thread until the stream starts or {@link
#shutdown()} is called.
+ */
+ void awaitInitialBackendWorkerMetadataStream() {
+ boolean isInitialStreamStarted = false;
+ int waitedSeconds = 0;
+ while (!isInitialStreamStarted && !isShutdown) {
+ try {
+ isInitialStreamStarted = initialStreamStarted.await(10,
TimeUnit.SECONDS);
Review Comment:
done
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: github-unsubscr...@beam.apache.org
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
