m-trieu commented on code in PR #27767: URL: https://github.com/apache/beam/pull/27767#discussion_r1317710815
########## runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/windmill/grpcclient/GrpcGetWorkerMetadataStream.java: ########## @@ -0,0 +1,237 @@ +/* + * 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.windmill.grpcclient; + +import java.io.PrintWriter; +import java.util.Set; +import java.util.concurrent.locks.StampedLock; +import java.util.function.Consumer; +import java.util.function.Function; +import org.apache.beam.runners.dataflow.worker.windmill.AbstractWindmillStream; +import org.apache.beam.runners.dataflow.worker.windmill.StreamObserverFactory; +import org.apache.beam.runners.dataflow.worker.windmill.Windmill.JobHeader; +import org.apache.beam.runners.dataflow.worker.windmill.Windmill.WorkerMetadataRequest; +import org.apache.beam.runners.dataflow.worker.windmill.Windmill.WorkerMetadataResponse; +import org.apache.beam.runners.dataflow.worker.windmill.WindmillEndpoints; +import org.apache.beam.runners.dataflow.worker.windmill.WindmillStream.GetWorkerMetadataStream; +import org.apache.beam.sdk.util.BackOff; +import org.apache.beam.sdk.util.FluentBackoff; +import org.apache.beam.vendor.grpc.v1p54p0.io.grpc.stub.StreamObserver; +import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.annotations.VisibleForTesting; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +final class GrpcGetWorkerMetadataStream + extends AbstractWindmillStream<WorkerMetadataRequest, WorkerMetadataResponse> + implements GetWorkerMetadataStream { + private static final Logger LOG = LoggerFactory.getLogger(GrpcGetWorkerMetadataStream.class); + private static final WorkerMetadataRequest HEALTH_CHECK_REQUEST = + WorkerMetadataRequest.getDefaultInstance(); + private final WorkerMetadataRequest workerMetadataRequest; + private final ThrottleTimer getWorkerMetadataThrottleTimer; + private final Consumer<WindmillEndpoints> serverMappingConsumer; + + /** Guards access to metadataVersion and latestResponse. */ + private final StampedLock metadataLock; + + private long metadataVersion; + private WorkerMetadataResponse latestResponse; + + private GrpcGetWorkerMetadataStream( + Function<StreamObserver<WorkerMetadataResponse>, StreamObserver<WorkerMetadataRequest>> + startGetWorkerMetadataRpcFn, + BackOff backoff, + StreamObserverFactory streamObserverFactory, + Set<AbstractWindmillStream<?, ?>> streamRegistry, + int logEveryNStreamFailures, + JobHeader jobHeader, + long metadataVersion, + ThrottleTimer getWorkerMetadataThrottleTimer, + Consumer<WindmillEndpoints> serverMappingConsumer, + StampedLock metadataLock) { + super( + startGetWorkerMetadataRpcFn, + backoff, + streamObserverFactory, + streamRegistry, + logEveryNStreamFailures); + this.workerMetadataRequest = WorkerMetadataRequest.newBuilder().setHeader(jobHeader).build(); + this.metadataVersion = metadataVersion; + this.getWorkerMetadataThrottleTimer = getWorkerMetadataThrottleTimer; + this.serverMappingConsumer = serverMappingConsumer; + this.latestResponse = WorkerMetadataResponse.getDefaultInstance(); + this.metadataLock = metadataLock; + } + + public static GrpcGetWorkerMetadataStream create( + Function<StreamObserver<WorkerMetadataResponse>, StreamObserver<WorkerMetadataRequest>> + startGetWorkerMetadataRpcFn, + BackOff backoff, + StreamObserverFactory streamObserverFactory, + Set<AbstractWindmillStream<?, ?>> streamRegistry, + int logEveryNStreamFailures, + JobHeader jobHeader, + int metadataVersion, + ThrottleTimer getWorkerMetadataThrottleTimer, + Consumer<WindmillEndpoints> serverMappingUpdater) { + GrpcGetWorkerMetadataStream getWorkerMetadataStream = + new GrpcGetWorkerMetadataStream( + startGetWorkerMetadataRpcFn, + backoff, + streamObserverFactory, + streamRegistry, + logEveryNStreamFailures, + jobHeader, + metadataVersion, + getWorkerMetadataThrottleTimer, + serverMappingUpdater, + new StampedLock()); + getWorkerMetadataStream.startStream(); + return getWorkerMetadataStream; + } + + @VisibleForTesting + static GrpcGetWorkerMetadataStream forTesting( + Function<StreamObserver<WorkerMetadataResponse>, StreamObserver<WorkerMetadataRequest>> + getWorkerMetadataRpc, + int metadataVersion, + JobHeader jobHeader, + Set<AbstractWindmillStream<?, ?>> streamRegistry, + Consumer<WindmillEndpoints> serverMappingUpdater, + StampedLock lock) { + GrpcGetWorkerMetadataStream testStream = + new GrpcGetWorkerMetadataStream( + getWorkerMetadataRpc, + FluentBackoff.DEFAULT.backoff(), + StreamObserverFactory.direct(DEFAULT_STREAM_RPC_DEADLINE_SECONDS * 2, 1), + streamRegistry, + 1, // logEveryNStreamFailures + jobHeader, + metadataVersion, + new ThrottleTimer(), + serverMappingUpdater, + lock); + testStream.startStream(); + return testStream; + } + + /** + * Each instance of {@link AbstractWindmillStream} owns its own responseObserver that calls + * onResponse(). + */ + @Override + protected void onResponse(WorkerMetadataResponse response) { + long readStamp = metadataLock.tryOptimisticRead(); Review Comment: done. using an object and synchronizing on it for read/write access -- This is an automated message from the Apache Git Service. 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