m-trieu commented on code in PR #34053: URL: https://github.com/apache/beam/pull/34053#discussion_r2005992630
########## runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/streaming/harness/BackendWorkerMetadataVendor.java: ########## @@ -0,0 +1,118 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.beam.runners.dataflow.worker.streaming.harness; + +import com.google.common.util.concurrent.ThreadFactoryBuilder; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.function.Consumer; +import java.util.function.Function; +import javax.annotation.concurrent.ThreadSafe; +import org.apache.beam.runners.dataflow.worker.windmill.WindmillEndpoints; +import org.apache.beam.runners.dataflow.worker.windmill.client.WindmillStream.GetWorkerMetadataStream; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +@ThreadSafe +final class BackendWorkerMetadataVendor { + private static final Logger LOG = LoggerFactory.getLogger(BackendWorkerMetadataVendor.class); + private static final int GET_WORKER_METADATA_STREAM_TIMEOUT_MINUTES = 3; + private static final String BACKEND_WORKER_METADATA_VENDOR_THREAD_NAME = + "BackendWorkerMetadataVendorThread"; + + private final Function<Consumer<WindmillEndpoints>, GetWorkerMetadataStream> + getWorkerMetadataStreamFactory; + private final ExecutorService workerMetadataFetcher; + private final AtomicBoolean isRunning = new AtomicBoolean(false); + + private BackendWorkerMetadataVendor( + Function<Consumer<WindmillEndpoints>, GetWorkerMetadataStream> getWorkerMetadataStreamFactory, + ExecutorService workerMetadataFetcher) { + this.getWorkerMetadataStreamFactory = getWorkerMetadataStreamFactory; + this.workerMetadataFetcher = workerMetadataFetcher; + } + + static BackendWorkerMetadataVendor create( + Function<Consumer<WindmillEndpoints>, GetWorkerMetadataStream> + getWorkerMetadataStreamFactory) { + return new BackendWorkerMetadataVendor( + getWorkerMetadataStreamFactory, + Executors.newSingleThreadExecutor( + new ThreadFactoryBuilder() + .setNameFormat(BACKEND_WORKER_METADATA_VENDOR_THREAD_NAME) + .build())); + } + + /** + * Starts the vending of backend worker metadata, passing it to endpointsConsumer for processing. + */ + void start(Consumer<WindmillEndpoints> endpointsConsumer) { + if (isRunning.compareAndSet(false, true)) { + LOG.debug("Starting WorkerMetadataVendor..."); + // Block on the initial workerMetadata. + // Run the subsequent fetches on a separate thread. + fetchAndConsumeWorkerMetadata(endpointsConsumer); Review Comment: done ########## runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/streaming/harness/BackendWorkerMetadataVendor.java: ########## @@ -0,0 +1,125 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.beam.runners.dataflow.worker.streaming.harness; + +import com.google.common.util.concurrent.ThreadFactoryBuilder; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.function.Consumer; +import java.util.function.Function; +import javax.annotation.concurrent.ThreadSafe; +import org.apache.beam.runners.dataflow.worker.windmill.WindmillEndpoints; +import org.apache.beam.runners.dataflow.worker.windmill.client.WindmillStream.GetWorkerMetadataStream; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * Manages vending the backend worker metadata to a single consumer. + * + * <p>Internally restarts the underlying {@link GetWorkerMetadataStream} to gracefully close the + * stream and prevent gRPC {@link + * org.apache.beam.vendor.grpc.v1p69p0.io.grpc.Status#DEADLINE_EXCEEDED} statuses. + */ +@ThreadSafe +final class BackendWorkerMetadataVendor { + private static final Logger LOG = LoggerFactory.getLogger(BackendWorkerMetadataVendor.class); + private static final int GET_WORKER_METADATA_STREAM_TIMEOUT_MINUTES = 3; + private static final String BACKEND_WORKER_METADATA_VENDOR_THREAD_NAME = + "BackendWorkerMetadataVendorThread"; + + private final Function<Consumer<WindmillEndpoints>, GetWorkerMetadataStream> + getWorkerMetadataStreamFactory; + private final ExecutorService workerMetadataFetcher; + private final AtomicBoolean isRunning = new AtomicBoolean(false); + + private BackendWorkerMetadataVendor( + Function<Consumer<WindmillEndpoints>, GetWorkerMetadataStream> getWorkerMetadataStreamFactory, + ExecutorService workerMetadataFetcher) { + this.getWorkerMetadataStreamFactory = getWorkerMetadataStreamFactory; + this.workerMetadataFetcher = workerMetadataFetcher; + } + + static BackendWorkerMetadataVendor create( + Function<Consumer<WindmillEndpoints>, GetWorkerMetadataStream> + getWorkerMetadataStreamFactory) { + return new BackendWorkerMetadataVendor( + getWorkerMetadataStreamFactory, + Executors.newSingleThreadExecutor( + new ThreadFactoryBuilder() + .setNameFormat(BACKEND_WORKER_METADATA_VENDOR_THREAD_NAME) + .build())); + } + + /** + * Starts the vending of backend worker metadata, passing it to endpointsConsumer for processing. + */ + void start(Consumer<WindmillEndpoints> endpointsConsumer) { + if (isRunning.compareAndSet(false, true)) { + LOG.debug("Starting WorkerMetadataVendor..."); + // Block on the initial workerMetadata. + // Run the subsequent fetches on a separate thread. + fetchAndConsumeWorkerMetadata(endpointsConsumer); + LOG.debug("Initial WorkerMetadata received."); + workerMetadataFetcher.execute( + () -> { + while (isRunning.get()) { + fetchAndConsumeWorkerMetadata(endpointsConsumer); + } + }); + } + } + + void stop() { + if (isRunning.compareAndSet(true, false)) { + LOG.debug("Shutting down WorkerMetadataVendor..."); + workerMetadataFetcher.shutdown(); + boolean isShutdown = false; + try { + isShutdown = + workerMetadataFetcher.awaitTermination( + GET_WORKER_METADATA_STREAM_TIMEOUT_MINUTES, TimeUnit.MINUTES); + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + LOG.warn("Unable to shutdown WorkerMetadataFetcher."); + } + + if (!isShutdown) { + workerMetadataFetcher.shutdownNow(); + } + } + } + + private void fetchAndConsumeWorkerMetadata(Consumer<WindmillEndpoints> endpointsConsumer) { + GetWorkerMetadataStream getWorkerMetadataStream = + getWorkerMetadataStreamFactory.apply(endpointsConsumer); Review Comment: done -- This is an automated message from the Apache Git Service. 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