m-trieu commented on code in PR #28835: URL: https://github.com/apache/beam/pull/28835#discussion_r1399908167
########## runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/windmill/client/grpc/StreamingEngineClient.java: ########## @@ -0,0 +1,432 @@ +/* + * 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.client.grpc; + +import static org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList.toImmutableList; +import static org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableMap.toImmutableMap; + +import com.google.errorprone.annotations.CheckReturnValue; +import java.util.Map; +import java.util.Optional; +import java.util.Random; +import java.util.concurrent.CountDownLatch; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.concurrent.atomic.AtomicReference; +import java.util.function.Function; +import java.util.function.Supplier; +import java.util.stream.Collectors; +import javax.annotation.Nullable; +import javax.annotation.concurrent.ThreadSafe; +import org.apache.beam.repackaged.core.org.apache.commons.lang3.tuple.Pair; +import org.apache.beam.runners.dataflow.worker.windmill.CloudWindmillServiceV1Alpha1Grpc.CloudWindmillServiceV1Alpha1Stub; +import org.apache.beam.runners.dataflow.worker.windmill.Windmill.GetWorkRequest; +import org.apache.beam.runners.dataflow.worker.windmill.Windmill.JobHeader; +import org.apache.beam.runners.dataflow.worker.windmill.WindmillConnection; +import org.apache.beam.runners.dataflow.worker.windmill.WindmillEndpoints; +import org.apache.beam.runners.dataflow.worker.windmill.WindmillEndpoints.Endpoint; +import org.apache.beam.runners.dataflow.worker.windmill.client.WindmillStream; +import org.apache.beam.runners.dataflow.worker.windmill.client.WindmillStream.GetDataStream; +import org.apache.beam.runners.dataflow.worker.windmill.client.WindmillStream.GetWorkerMetadataStream; +import org.apache.beam.runners.dataflow.worker.windmill.client.grpc.stubs.WindmillStubFactory; +import org.apache.beam.runners.dataflow.worker.windmill.client.throttling.ThrottleTimer; +import org.apache.beam.runners.dataflow.worker.windmill.work.ProcessWorkItem; +import org.apache.beam.runners.dataflow.worker.windmill.work.budget.GetWorkBudget; +import org.apache.beam.runners.dataflow.worker.windmill.work.budget.GetWorkBudgetDistributor; +import org.apache.beam.runners.dataflow.worker.windmill.work.budget.GetWorkBudgetRefresher; +import org.apache.beam.sdk.annotations.Internal; +import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.annotations.VisibleForTesting; +import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions; +import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableCollection; +import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList; +import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableMap; +import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableSet; +import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.util.concurrent.ThreadFactoryBuilder; +import org.joda.time.Instant; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * Client for StreamingEngine. Given a {@link GetWorkBudget}, divides the budget and starts the + * {@link WindmillStream.GetWorkStream}(s). + */ +@Internal +@CheckReturnValue +@ThreadSafe +public class StreamingEngineClient { + private static final Logger LOG = LoggerFactory.getLogger(StreamingEngineClient.class); + private static final String CONSUMER_WORKER_METADATA_THREAD = "ConsumeWorkerMetadataThread"; + + private final AtomicBoolean started; + private final JobHeader jobHeader; + private final GetWorkBudget totalGetWorkBudget; + private final GrpcWindmillStreamFactory streamFactory; + private final ProcessWorkItem processWorkItem; + private final WindmillStubFactory stubFactory; + private final GetWorkBudgetDistributor getWorkBudgetDistributor; + private final GrpcDispatcherClient dispatcherClient; + private final AtomicBoolean isBudgetRefreshPaused; + /** Writes are guarded by synchronization, reads are lock free. */ + private final AtomicReference<StreamEngineConnectionState> connections; + + private final GetWorkBudgetRefresher getWorkBudgetRefresher; + private final AtomicReference<Instant> lastBudgetRefresh; + private final ThrottleTimer getWorkerMetadataThrottleTimer; + private final CountDownLatch getWorkerMetadataReady; + private final ExecutorService consumeWorkerMetadataExecutor; + private final long clientId; + /** + * Reference to {@link GetWorkerMetadataStream} that is lazily initialized via double check + * locking, with its initial value being null. + */ + private volatile @Nullable GetWorkerMetadataStream getWorkerMetadataStream; + + private StreamingEngineClient( + JobHeader jobHeader, + GetWorkBudget totalGetWorkBudget, + AtomicReference<StreamEngineConnectionState> connections, + GrpcWindmillStreamFactory streamFactory, + ProcessWorkItem processWorkItem, + WindmillStubFactory stubFactory, + GetWorkBudgetDistributor getWorkBudgetDistributor, + GrpcDispatcherClient dispatcherClient, + long clientId) { + this.jobHeader = jobHeader; + this.totalGetWorkBudget = totalGetWorkBudget; + this.started = new AtomicBoolean(); + this.streamFactory = streamFactory; + this.processWorkItem = processWorkItem; + this.connections = connections; + this.stubFactory = stubFactory; + this.getWorkBudgetDistributor = getWorkBudgetDistributor; + this.dispatcherClient = dispatcherClient; + this.isBudgetRefreshPaused = new AtomicBoolean(false); + this.getWorkerMetadataThrottleTimer = new ThrottleTimer(); + this.consumeWorkerMetadataExecutor = + Executors.newSingleThreadScheduledExecutor( + new ThreadFactoryBuilder() + .setNameFormat(StreamingEngineClient.CONSUMER_WORKER_METADATA_THREAD) + // JVM will be responsible for shutdown and garbage collect these threads. + .setDaemon(true) + .setUncaughtExceptionHandler( + (t, e) -> + LOG.error( + "{} failed due to uncaught exception during execution. ", + t.getName(), + e)) + .build()); + this.getWorkerMetadataStream = null; + this.getWorkerMetadataReady = new CountDownLatch(1); + this.clientId = clientId; + this.lastBudgetRefresh = new AtomicReference<>(Instant.EPOCH); + this.getWorkBudgetRefresher = + new GetWorkBudgetRefresher( + isBudgetRefreshPaused::get, + () -> { + getWorkBudgetDistributor.distributeBudget( + connections.get().windmillStreams().values(), totalGetWorkBudget); + lastBudgetRefresh.set(Instant.now()); + }); + } + + /** + * Creates an instance of {@link StreamingEngineClient} and starts the {@link + * GetWorkerMetadataStream} with an RPC to the StreamingEngine backend. {@link + * GetWorkerMetadataStream} will populate {@link #connections} when a response is received. Calls + * to {@link #startAndCacheStreams()} will block until {@link #connections} are populated. + */ + public static StreamingEngineClient create( + JobHeader jobHeader, + GetWorkBudget totalGetWorkBudget, + GrpcWindmillStreamFactory streamingEngineStreamFactory, + ProcessWorkItem processWorkItem, + WindmillStubFactory windmillGrpcStubFactory, + GetWorkBudgetDistributor getWorkBudgetDistributor, + GrpcDispatcherClient dispatcherClient) { + StreamingEngineClient streamingEngineClient = + new StreamingEngineClient( + jobHeader, + totalGetWorkBudget, + new AtomicReference<>(StreamEngineConnectionState.EMPTY), + streamingEngineStreamFactory, + processWorkItem, + windmillGrpcStubFactory, + getWorkBudgetDistributor, + dispatcherClient, + new Random().nextLong()); + streamingEngineClient.startGetWorkerMetadataStream(); + return streamingEngineClient; + } + + @VisibleForTesting + static StreamingEngineClient forTesting( + JobHeader jobHeader, + GetWorkBudget totalGetWorkBudget, + AtomicReference<StreamEngineConnectionState> connections, + GrpcWindmillStreamFactory streamFactory, + ProcessWorkItem processWorkItem, + WindmillStubFactory stubFactory, + GetWorkBudgetDistributor getWorkBudgetDistributor, + GrpcDispatcherClient dispatcherClient, + long clientId) { + StreamingEngineClient streamingEngineClient = + new StreamingEngineClient( + jobHeader, + totalGetWorkBudget, + connections, + streamFactory, + processWorkItem, + stubFactory, + getWorkBudgetDistributor, + dispatcherClient, + clientId); + streamingEngineClient.startGetWorkerMetadataStream(); + return streamingEngineClient; + } + + /** + * Starts the streams with the {@link #connections} values. Does nothing if this has already been + * called. + * + * @throws IllegalArgumentException if trying to start before {@link #connections} are set with + * {@link GetWorkerMetadataStream}. + */ + public void startAndCacheStreams() { + // Do nothing if we have already initialized the initial streams. + if (!started.compareAndSet(false, true)) { + return; + } + + // This will block if we have not received the first response from GetWorkerMetadata. + waitForFirstStreamingEngineEndpoints(); + StreamEngineConnectionState currentConnectionsState = connections.get(); + Preconditions.checkState( + !StreamEngineConnectionState.EMPTY.equals(currentConnectionsState), + "Cannot start streams without connections."); + + LOG.info("Starting initial GetWorkStreams with connections={}", currentConnectionsState); + ImmutableCollection<WindmillStreamSender> windmillStreamSenders = + currentConnectionsState.windmillStreams().values(); + getWorkBudgetDistributor.distributeBudget( + currentConnectionsState.windmillStreams().values(), totalGetWorkBudget); + lastBudgetRefresh.compareAndSet(Instant.EPOCH, Instant.now()); + windmillStreamSenders.forEach(WindmillStreamSender::startStreams); + getWorkBudgetRefresher.start(); + } + + @VisibleForTesting + void finish() { + if (started.compareAndSet(true, false)) { + return; + } + + Optional.ofNullable(getWorkerMetadataStream).ifPresent(GetWorkerMetadataStream::close); + getWorkBudgetRefresher.stop(); + consumeWorkerMetadataExecutor.shutdownNow(); + } + + private void waitForFirstStreamingEngineEndpoints() { + try { + getWorkerMetadataReady.await(); + } catch (InterruptedException e) { + throw new StreamingEngineClientException( + "Error occurred waiting for StreamingEngine backend endpoints.", e); + } + } + + /** + * {@link java.util.function.Consumer< WindmillEndpoints >} used to update {@link #connections} on + * new backend worker metadata. + */ + private synchronized void consumeWindmillWorkerEndpoints(WindmillEndpoints newWindmillEndpoints) { + isBudgetRefreshPaused.set(true); + LOG.info("Consuming new windmill endpoints: {}", newWindmillEndpoints); + ImmutableMap<Endpoint, WindmillConnection> newWindmillConnections = + createNewWindmillConnections(ImmutableSet.copyOf(newWindmillEndpoints.windmillEndpoints())); + ImmutableMap<WindmillConnection, WindmillStreamSender> newWindmillStreams = + closeStaleStreamsAndCreateNewStreams(ImmutableSet.copyOf(newWindmillConnections.values())); + ImmutableMap<Endpoint, Supplier<GetDataStream>> newGlobalDataStreams = + createNewGlobalDataStreams( + ImmutableSet.copyOf(newWindmillEndpoints.globalDataEndpoints().values())); + + StreamEngineConnectionState newConnectionsState = + StreamEngineConnectionState.builder() + .setWindmillConnections(newWindmillConnections) + .setWindmillStreams(newWindmillStreams) + .setGlobalDataEndpoints(newWindmillEndpoints.globalDataEndpoints()) + .setGlobalDataStreams(newGlobalDataStreams) + .build(); + + LOG.info( + "Setting new connections: {}. Previous connections: {}.", + newConnectionsState, + connections.get()); + connections.set(newConnectionsState); + isBudgetRefreshPaused.set(false); + + // Trigger on first worker metadata. Since startAndCacheStreams will block until first worker + // metadata is ready. Afterwards, just trigger a budget refresh. + if (getWorkerMetadataReady.getCount() > 0) { + getWorkerMetadataReady.countDown(); + } else { + getWorkBudgetRefresher.requestBudgetRefresh(); + } + } + + public final ImmutableList<Long> getAndResetThrottleTimes() { + StreamEngineConnectionState currentConnections = connections.get(); + + ImmutableList<Long> keyedWorkStreamThrottleTimes = + currentConnections.windmillStreams().values().stream() + .map(WindmillStreamSender::getAndResetThrottleTime) + .collect(toImmutableList()); + + return ImmutableList.<Long>builder() + .add(getWorkerMetadataThrottleTimer.getAndResetThrottleTime()) + .addAll(keyedWorkStreamThrottleTimes) + .build(); + } + + /** Starts {@link GetWorkerMetadataStream}. */ + @SuppressWarnings({ + "FutureReturnValueIgnored", // ignoring Future returned from Executor.submit() + "nullness" // Uninitialized value of getWorkerMetadataStream is null. + }) + private void startGetWorkerMetadataStream() { + // We only want to set and start this value once. + if (getWorkerMetadataStream == null) { + synchronized (this) { + if (getWorkerMetadataStream == null) { + getWorkerMetadataStream = + streamFactory.createGetWorkerMetadataStream( + dispatcherClient.getDispatcherStub(), + getWorkerMetadataThrottleTimer, + endpoints -> + // Run this on a separate thread than the grpc stream thread. Review Comment: sgtm added the following guava collections has an evicting queue We can have a Synchronized EvictingQueue of size 1. GetWorkerMetadataStream pushes the new windmill endpoints to `newWorkerMetadataPublisher` which is an executor that writes to the EvictingQueue. There will be `newWorkerMetadataConsumer`, an executor that has a while(true) loop, that is constantly polling EvictingQueue, consuming the worker metadata if 1 is present. -- 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: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
