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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2020/05/14 03:59:33 UTC
[GitHub] [flink] KurtYoung commented on a change in pull request #12069: [FLINK-14807][streaming] Add specialized collecting sink function
KurtYoung commented on a change in pull request #12069:
URL: https://github.com/apache/flink/pull/12069#discussion_r424837349
##########
File path: flink-runtime/src/main/java/org/apache/flink/runtime/taskexecutor/TaskManagerConfiguration.java
##########
@@ -162,9 +174,28 @@ public RetryingRegistrationConfiguration getRetryingRegistrationConfiguration()
// Static factory methods
// --------------------------------------------------------------------------------------------
+ @VisibleForTesting
public static TaskManagerConfiguration fromConfiguration(
Configuration configuration,
TaskExecutorResourceSpec taskExecutorResourceSpec) {
+ try {
+ TaskManagerServicesConfiguration servicesConfiguration =
+ TaskManagerServicesConfiguration.fromConfiguration(
+ configuration,
+ ResourceID.generate(),
+ InetAddress.getLoopbackAddress().getHostAddress(),
Review comment:
As long as I can see, currently there is no magic happens during obtaining task manager's address. Why not simply using this `InetAddress.getLoopbackAddress().getHostAddress()` to get the address inside the collect sink function?
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/collect/CollectSinkOperatorCoordinator.java
##########
@@ -0,0 +1,212 @@
+/*
+ * 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.flink.streaming.api.operators.collect;
+
+import org.apache.flink.core.memory.DataInputViewStreamWrapper;
+import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
+import org.apache.flink.runtime.jobgraph.OperatorID;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequest;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequestHandler;
+import org.apache.flink.runtime.operators.coordination.CoordinationResponse;
+import org.apache.flink.runtime.operators.coordination.OperatorCoordinator;
+import org.apache.flink.runtime.operators.coordination.OperatorEvent;
+import org.apache.flink.util.Preconditions;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.util.Collections;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+/**
+ * {@link OperatorCoordinator} for {@link CollectSinkFunction}.
+ *
+ * <p>This coordinator only forwards requests and responses from clients and sinks,
+ * it does not store any state in itself.
+ */
+public class CollectSinkOperatorCoordinator implements OperatorCoordinator, CoordinationRequestHandler {
+
+ private static final Logger LOG = LoggerFactory.getLogger(CollectSinkOperatorCoordinator.class);
+
+ private InetSocketAddress address;
+ private Socket socket;
+
+ private ExecutorService executorService;
+
+ @Override
+ public void start() throws Exception {
+ this.executorService = Executors.newFixedThreadPool(1);
+ }
+
+ @Override
+ public void close() throws Exception {
+ closeCurrentConnection();
+ this.executorService.shutdown();
Review comment:
shutdown service first
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/collect/CollectSinkOperatorCoordinator.java
##########
@@ -0,0 +1,212 @@
+/*
+ * 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.flink.streaming.api.operators.collect;
+
+import org.apache.flink.core.memory.DataInputViewStreamWrapper;
+import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
+import org.apache.flink.runtime.jobgraph.OperatorID;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequest;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequestHandler;
+import org.apache.flink.runtime.operators.coordination.CoordinationResponse;
+import org.apache.flink.runtime.operators.coordination.OperatorCoordinator;
+import org.apache.flink.runtime.operators.coordination.OperatorEvent;
+import org.apache.flink.util.Preconditions;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.util.Collections;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+/**
+ * {@link OperatorCoordinator} for {@link CollectSinkFunction}.
+ *
+ * <p>This coordinator only forwards requests and responses from clients and sinks,
+ * it does not store any state in itself.
Review comment:
This comment conflicts with current implementation.
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/collect/CollectCoordinationRequest.java
##########
@@ -0,0 +1,86 @@
+/*
+ * 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.flink.streaming.api.operators.collect;
+
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.api.common.typeutils.base.LongSerializer;
+import org.apache.flink.api.common.typeutils.base.StringSerializer;
+import org.apache.flink.core.memory.DataInputViewStreamWrapper;
+import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequest;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+
+/**
+ * A {@link CoordinationRequest} from the client indicating that it wants a new batch of query results.
+ */
+public class CollectCoordinationRequest implements CoordinationRequest {
+
+ private static final long serialVersionUID = 1L;
+
+ private final byte[] bytes;
+
+ public CollectCoordinationRequest(String version, long token) {
+ ByteArrayOutputStream baos = new ByteArrayOutputStream();
+ DataOutputViewStreamWrapper wrapper = new DataOutputViewStreamWrapper(baos);
+ TypeSerializer<String> versionSerializer = new StringSerializer();
+ TypeSerializer<Long> tokenSerializer = new LongSerializer();
+ try {
+ versionSerializer.serialize(version, wrapper);
+ tokenSerializer.serialize(token, wrapper);
+ } catch (IOException e) {
+ throw new RuntimeException("Failed to serialize collect sink request", e);
+ }
+ this.bytes = baos.toByteArray();
+ }
+
+ public byte[] getBytes() {
+ return bytes;
+ }
+
+ public static DeserializedRequest deserialize(DataInputViewStreamWrapper wrapper) throws IOException {
+ TypeSerializer<String> versionSerializer = new StringSerializer();
+ TypeSerializer<Long> tokenSerializer = new LongSerializer();
+ String version = versionSerializer.deserialize(wrapper);
+ long token = tokenSerializer.deserialize(wrapper);
+ return new DeserializedRequest(version, token);
+ }
+
+ /**
+ * Deserialized request containing version and token.
+ */
+ public static class DeserializedRequest {
Review comment:
This is unnecessary, you can directly put these two fields into CollectCoordinationRequest, and mark the `bytes` as `serializedBytes`.
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/collect/CollectSinkOperatorCoordinator.java
##########
@@ -0,0 +1,212 @@
+/*
+ * 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.flink.streaming.api.operators.collect;
+
+import org.apache.flink.core.memory.DataInputViewStreamWrapper;
+import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
+import org.apache.flink.runtime.jobgraph.OperatorID;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequest;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequestHandler;
+import org.apache.flink.runtime.operators.coordination.CoordinationResponse;
+import org.apache.flink.runtime.operators.coordination.OperatorCoordinator;
+import org.apache.flink.runtime.operators.coordination.OperatorEvent;
+import org.apache.flink.util.Preconditions;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.util.Collections;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+/**
+ * {@link OperatorCoordinator} for {@link CollectSinkFunction}.
+ *
+ * <p>This coordinator only forwards requests and responses from clients and sinks,
+ * it does not store any state in itself.
+ */
+public class CollectSinkOperatorCoordinator implements OperatorCoordinator, CoordinationRequestHandler {
+
+ private static final Logger LOG = LoggerFactory.getLogger(CollectSinkOperatorCoordinator.class);
+
+ private InetSocketAddress address;
Review comment:
This address needs lock protection. Event handling and coordination request handling will be executed by different threads.
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/collect/CollectSinkOperatorCoordinator.java
##########
@@ -0,0 +1,212 @@
+/*
+ * 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.flink.streaming.api.operators.collect;
+
+import org.apache.flink.core.memory.DataInputViewStreamWrapper;
+import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
+import org.apache.flink.runtime.jobgraph.OperatorID;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequest;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequestHandler;
+import org.apache.flink.runtime.operators.coordination.CoordinationResponse;
+import org.apache.flink.runtime.operators.coordination.OperatorCoordinator;
+import org.apache.flink.runtime.operators.coordination.OperatorEvent;
+import org.apache.flink.util.Preconditions;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.util.Collections;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+/**
+ * {@link OperatorCoordinator} for {@link CollectSinkFunction}.
+ *
+ * <p>This coordinator only forwards requests and responses from clients and sinks,
+ * it does not store any state in itself.
+ */
+public class CollectSinkOperatorCoordinator implements OperatorCoordinator, CoordinationRequestHandler {
+
+ private static final Logger LOG = LoggerFactory.getLogger(CollectSinkOperatorCoordinator.class);
+
+ private InetSocketAddress address;
+ private Socket socket;
+
+ private ExecutorService executorService;
+
+ @Override
+ public void start() throws Exception {
+ this.executorService = Executors.newFixedThreadPool(1);
+ }
+
+ @Override
+ public void close() throws Exception {
+ closeCurrentConnection();
+ this.executorService.shutdown();
+ }
+
+ @Override
+ public void handleEventFromOperator(int subtask, OperatorEvent event) throws Exception {
+ Preconditions.checkArgument(
+ event instanceof CollectSinkAddressEvent, "Operator event must be a CollectSinkAddressEvent");
+ address = ((CollectSinkAddressEvent) event).getAddress();
+ LOG.debug("Received sink socket server address: " + address);
+
+ // this event is sent when the sink function starts, so we remove the old socket if it is present
+ socket = null;
+ }
+
+ @Override
+ public CompletableFuture<CoordinationResponse> handleCoordinationRequest(CoordinationRequest request) {
+ Preconditions.checkArgument(
+ request instanceof CollectCoordinationRequest,
+ "Coordination request must be a CollectCoordinationRequest");
+
+ CompletableFuture<CoordinationResponse> responseFuture = new CompletableFuture<>();
+ executorService.submit(() -> handleRequestImpl((CollectCoordinationRequest) request, responseFuture));
+ return responseFuture;
+ }
+
+ private void handleRequestImpl(
+ CollectCoordinationRequest request,
+ CompletableFuture<CoordinationResponse> responseFuture) {
+ // there is no thread safety issue in this method
+ // because the thread pool has only 1 thread
+ // and by design there shall be only 1 client reading from this coordinator
+ if (address == null) {
+ responseFuture.complete(new CollectCoordinationResponse(createEmptySerializedResult(request)));
+ }
+
+ try {
+ if (socket == null) {
+ socket = new Socket(address.getAddress(), address.getPort());
+ LOG.debug("Sink connection established");
Review comment:
use info log
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/collect/CollectCoordinationResponse.java
##########
@@ -0,0 +1,126 @@
+/*
+ * 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.flink.streaming.api.operators.collect;
+
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.api.common.typeutils.base.LongSerializer;
+import org.apache.flink.api.common.typeutils.base.StringSerializer;
+import org.apache.flink.core.memory.DataInputViewStreamWrapper;
+import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
+import org.apache.flink.runtime.operators.coordination.CoordinationResponse;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A {@link CoordinationResponse} from the coordinator containing the required batch or new results
+ * and other necessary information in serialized form.
+ */
+public class CollectCoordinationResponse implements CoordinationResponse {
+
+ private static final long serialVersionUID = 1L;
+
+ private final byte[] bytes;
+
+ public CollectCoordinationResponse(byte[] bytes) {
+ this.bytes = bytes;
+ }
+
+ public <T> DeserializedResponse<T> getDeserializedResponse(TypeSerializer<T> serializer) {
+ ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
+ DataInputViewStreamWrapper wrapper = new DataInputViewStreamWrapper(bais);
+ TypeSerializer<String> versionSerializer = new StringSerializer();
Review comment:
use `StringSerializer.INSTANCE` instead
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/collect/CollectSinkOperatorCoordinator.java
##########
@@ -0,0 +1,212 @@
+/*
+ * 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.flink.streaming.api.operators.collect;
+
+import org.apache.flink.core.memory.DataInputViewStreamWrapper;
+import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
+import org.apache.flink.runtime.jobgraph.OperatorID;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequest;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequestHandler;
+import org.apache.flink.runtime.operators.coordination.CoordinationResponse;
+import org.apache.flink.runtime.operators.coordination.OperatorCoordinator;
+import org.apache.flink.runtime.operators.coordination.OperatorEvent;
+import org.apache.flink.util.Preconditions;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.util.Collections;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+/**
+ * {@link OperatorCoordinator} for {@link CollectSinkFunction}.
+ *
+ * <p>This coordinator only forwards requests and responses from clients and sinks,
+ * it does not store any state in itself.
+ */
+public class CollectSinkOperatorCoordinator implements OperatorCoordinator, CoordinationRequestHandler {
+
+ private static final Logger LOG = LoggerFactory.getLogger(CollectSinkOperatorCoordinator.class);
+
+ private InetSocketAddress address;
+ private Socket socket;
+
+ private ExecutorService executorService;
+
+ @Override
+ public void start() throws Exception {
+ this.executorService = Executors.newFixedThreadPool(1);
+ }
+
+ @Override
+ public void close() throws Exception {
+ closeCurrentConnection();
+ this.executorService.shutdown();
+ }
+
+ @Override
+ public void handleEventFromOperator(int subtask, OperatorEvent event) throws Exception {
+ Preconditions.checkArgument(
+ event instanceof CollectSinkAddressEvent, "Operator event must be a CollectSinkAddressEvent");
+ address = ((CollectSinkAddressEvent) event).getAddress();
+ LOG.debug("Received sink socket server address: " + address);
+
+ // this event is sent when the sink function starts, so we remove the old socket if it is present
+ socket = null;
+ }
+
+ @Override
+ public CompletableFuture<CoordinationResponse> handleCoordinationRequest(CoordinationRequest request) {
+ Preconditions.checkArgument(
+ request instanceof CollectCoordinationRequest,
+ "Coordination request must be a CollectCoordinationRequest");
+
+ CompletableFuture<CoordinationResponse> responseFuture = new CompletableFuture<>();
+ executorService.submit(() -> handleRequestImpl((CollectCoordinationRequest) request, responseFuture));
+ return responseFuture;
+ }
+
+ private void handleRequestImpl(
+ CollectCoordinationRequest request,
+ CompletableFuture<CoordinationResponse> responseFuture) {
+ // there is no thread safety issue in this method
Review comment:
not really, event handling is executed by JM's rpc thread.
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/collect/CollectSinkOperatorCoordinator.java
##########
@@ -0,0 +1,212 @@
+/*
+ * 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.flink.streaming.api.operators.collect;
+
+import org.apache.flink.core.memory.DataInputViewStreamWrapper;
+import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
+import org.apache.flink.runtime.jobgraph.OperatorID;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequest;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequestHandler;
+import org.apache.flink.runtime.operators.coordination.CoordinationResponse;
+import org.apache.flink.runtime.operators.coordination.OperatorCoordinator;
+import org.apache.flink.runtime.operators.coordination.OperatorEvent;
+import org.apache.flink.util.Preconditions;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.util.Collections;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+/**
+ * {@link OperatorCoordinator} for {@link CollectSinkFunction}.
+ *
+ * <p>This coordinator only forwards requests and responses from clients and sinks,
+ * it does not store any state in itself.
+ */
+public class CollectSinkOperatorCoordinator implements OperatorCoordinator, CoordinationRequestHandler {
+
+ private static final Logger LOG = LoggerFactory.getLogger(CollectSinkOperatorCoordinator.class);
+
+ private InetSocketAddress address;
+ private Socket socket;
+
+ private ExecutorService executorService;
+
+ @Override
+ public void start() throws Exception {
+ this.executorService = Executors.newFixedThreadPool(1);
+ }
+
+ @Override
+ public void close() throws Exception {
+ closeCurrentConnection();
+ this.executorService.shutdown();
+ }
+
+ @Override
+ public void handleEventFromOperator(int subtask, OperatorEvent event) throws Exception {
+ Preconditions.checkArgument(
+ event instanceof CollectSinkAddressEvent, "Operator event must be a CollectSinkAddressEvent");
+ address = ((CollectSinkAddressEvent) event).getAddress();
+ LOG.debug("Received sink socket server address: " + address);
+
+ // this event is sent when the sink function starts, so we remove the old socket if it is present
+ socket = null;
Review comment:
call `closeCurrentConnection` instead?
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/collect/CollectSinkOperatorCoordinator.java
##########
@@ -0,0 +1,212 @@
+/*
+ * 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.flink.streaming.api.operators.collect;
+
+import org.apache.flink.core.memory.DataInputViewStreamWrapper;
+import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
+import org.apache.flink.runtime.jobgraph.OperatorID;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequest;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequestHandler;
+import org.apache.flink.runtime.operators.coordination.CoordinationResponse;
+import org.apache.flink.runtime.operators.coordination.OperatorCoordinator;
+import org.apache.flink.runtime.operators.coordination.OperatorEvent;
+import org.apache.flink.util.Preconditions;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.util.Collections;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+/**
+ * {@link OperatorCoordinator} for {@link CollectSinkFunction}.
+ *
+ * <p>This coordinator only forwards requests and responses from clients and sinks,
+ * it does not store any state in itself.
+ */
+public class CollectSinkOperatorCoordinator implements OperatorCoordinator, CoordinationRequestHandler {
+
+ private static final Logger LOG = LoggerFactory.getLogger(CollectSinkOperatorCoordinator.class);
+
+ private InetSocketAddress address;
+ private Socket socket;
+
+ private ExecutorService executorService;
+
+ @Override
+ public void start() throws Exception {
+ this.executorService = Executors.newFixedThreadPool(1);
+ }
+
+ @Override
+ public void close() throws Exception {
+ closeCurrentConnection();
+ this.executorService.shutdown();
+ }
+
+ @Override
+ public void handleEventFromOperator(int subtask, OperatorEvent event) throws Exception {
+ Preconditions.checkArgument(
+ event instanceof CollectSinkAddressEvent, "Operator event must be a CollectSinkAddressEvent");
+ address = ((CollectSinkAddressEvent) event).getAddress();
+ LOG.debug("Received sink socket server address: " + address);
+
+ // this event is sent when the sink function starts, so we remove the old socket if it is present
+ socket = null;
+ }
+
+ @Override
+ public CompletableFuture<CoordinationResponse> handleCoordinationRequest(CoordinationRequest request) {
+ Preconditions.checkArgument(
+ request instanceof CollectCoordinationRequest,
+ "Coordination request must be a CollectCoordinationRequest");
+
+ CompletableFuture<CoordinationResponse> responseFuture = new CompletableFuture<>();
+ executorService.submit(() -> handleRequestImpl((CollectCoordinationRequest) request, responseFuture));
+ return responseFuture;
+ }
+
+ private void handleRequestImpl(
+ CollectCoordinationRequest request,
+ CompletableFuture<CoordinationResponse> responseFuture) {
+ // there is no thread safety issue in this method
+ // because the thread pool has only 1 thread
+ // and by design there shall be only 1 client reading from this coordinator
+ if (address == null) {
+ responseFuture.complete(new CollectCoordinationResponse(createEmptySerializedResult(request)));
+ }
+
+ try {
+ if (socket == null) {
+ socket = new Socket(address.getAddress(), address.getPort());
+ LOG.debug("Sink connection established");
+ }
+
+ // send version and token to sink server
+ LOG.debug("Forwarding request to sink socket server");
+ DataOutputViewStreamWrapper outStream = new DataOutputViewStreamWrapper(socket.getOutputStream());
Review comment:
after socket established, this `outStream` and `inStream` could be reused and don't have to create new instance each time
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/collect/CollectSinkOperatorCoordinator.java
##########
@@ -0,0 +1,212 @@
+/*
+ * 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.flink.streaming.api.operators.collect;
+
+import org.apache.flink.core.memory.DataInputViewStreamWrapper;
+import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
+import org.apache.flink.runtime.jobgraph.OperatorID;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequest;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequestHandler;
+import org.apache.flink.runtime.operators.coordination.CoordinationResponse;
+import org.apache.flink.runtime.operators.coordination.OperatorCoordinator;
+import org.apache.flink.runtime.operators.coordination.OperatorEvent;
+import org.apache.flink.util.Preconditions;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.util.Collections;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+/**
+ * {@link OperatorCoordinator} for {@link CollectSinkFunction}.
+ *
+ * <p>This coordinator only forwards requests and responses from clients and sinks,
+ * it does not store any state in itself.
+ */
+public class CollectSinkOperatorCoordinator implements OperatorCoordinator, CoordinationRequestHandler {
+
+ private static final Logger LOG = LoggerFactory.getLogger(CollectSinkOperatorCoordinator.class);
+
+ private InetSocketAddress address;
+ private Socket socket;
+
+ private ExecutorService executorService;
+
+ @Override
+ public void start() throws Exception {
+ this.executorService = Executors.newFixedThreadPool(1);
+ }
+
+ @Override
+ public void close() throws Exception {
+ closeCurrentConnection();
+ this.executorService.shutdown();
+ }
+
+ @Override
+ public void handleEventFromOperator(int subtask, OperatorEvent event) throws Exception {
+ Preconditions.checkArgument(
+ event instanceof CollectSinkAddressEvent, "Operator event must be a CollectSinkAddressEvent");
+ address = ((CollectSinkAddressEvent) event).getAddress();
+ LOG.debug("Received sink socket server address: " + address);
Review comment:
Use info log
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/collect/CollectSinkOperatorCoordinator.java
##########
@@ -0,0 +1,212 @@
+/*
+ * 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.flink.streaming.api.operators.collect;
+
+import org.apache.flink.core.memory.DataInputViewStreamWrapper;
+import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
+import org.apache.flink.runtime.jobgraph.OperatorID;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequest;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequestHandler;
+import org.apache.flink.runtime.operators.coordination.CoordinationResponse;
+import org.apache.flink.runtime.operators.coordination.OperatorCoordinator;
+import org.apache.flink.runtime.operators.coordination.OperatorEvent;
+import org.apache.flink.util.Preconditions;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.util.Collections;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+/**
+ * {@link OperatorCoordinator} for {@link CollectSinkFunction}.
+ *
+ * <p>This coordinator only forwards requests and responses from clients and sinks,
+ * it does not store any state in itself.
+ */
+public class CollectSinkOperatorCoordinator implements OperatorCoordinator, CoordinationRequestHandler {
+
+ private static final Logger LOG = LoggerFactory.getLogger(CollectSinkOperatorCoordinator.class);
+
+ private InetSocketAddress address;
+ private Socket socket;
+
+ private ExecutorService executorService;
+
+ @Override
+ public void start() throws Exception {
+ this.executorService = Executors.newFixedThreadPool(1);
+ }
+
+ @Override
+ public void close() throws Exception {
+ closeCurrentConnection();
+ this.executorService.shutdown();
+ }
+
+ @Override
+ public void handleEventFromOperator(int subtask, OperatorEvent event) throws Exception {
+ Preconditions.checkArgument(
+ event instanceof CollectSinkAddressEvent, "Operator event must be a CollectSinkAddressEvent");
+ address = ((CollectSinkAddressEvent) event).getAddress();
+ LOG.debug("Received sink socket server address: " + address);
+
+ // this event is sent when the sink function starts, so we remove the old socket if it is present
+ socket = null;
+ }
+
+ @Override
+ public CompletableFuture<CoordinationResponse> handleCoordinationRequest(CoordinationRequest request) {
+ Preconditions.checkArgument(
+ request instanceof CollectCoordinationRequest,
+ "Coordination request must be a CollectCoordinationRequest");
+
+ CompletableFuture<CoordinationResponse> responseFuture = new CompletableFuture<>();
+ executorService.submit(() -> handleRequestImpl((CollectCoordinationRequest) request, responseFuture));
+ return responseFuture;
+ }
+
+ private void handleRequestImpl(
+ CollectCoordinationRequest request,
+ CompletableFuture<CoordinationResponse> responseFuture) {
+ // there is no thread safety issue in this method
+ // because the thread pool has only 1 thread
+ // and by design there shall be only 1 client reading from this coordinator
+ if (address == null) {
+ responseFuture.complete(new CollectCoordinationResponse(createEmptySerializedResult(request)));
+ }
+
+ try {
+ if (socket == null) {
+ socket = new Socket(address.getAddress(), address.getPort());
Review comment:
also set
socket.setKeepAlive(true);
socket.setTcpNoDelay(true);
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/collect/CollectCoordinationResponse.java
##########
@@ -0,0 +1,126 @@
+/*
+ * 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.flink.streaming.api.operators.collect;
+
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.api.common.typeutils.base.LongSerializer;
+import org.apache.flink.api.common.typeutils.base.StringSerializer;
+import org.apache.flink.core.memory.DataInputViewStreamWrapper;
+import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
+import org.apache.flink.runtime.operators.coordination.CoordinationResponse;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A {@link CoordinationResponse} from the coordinator containing the required batch or new results
+ * and other necessary information in serialized form.
+ */
+public class CollectCoordinationResponse implements CoordinationResponse {
+
+ private static final long serialVersionUID = 1L;
+
+ private final byte[] bytes;
+
+ public CollectCoordinationResponse(byte[] bytes) {
+ this.bytes = bytes;
+ }
+
+ public <T> DeserializedResponse<T> getDeserializedResponse(TypeSerializer<T> serializer) {
+ ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
+ DataInputViewStreamWrapper wrapper = new DataInputViewStreamWrapper(bais);
+ TypeSerializer<String> versionSerializer = new StringSerializer();
+ TypeSerializer<Long> tokenSerializer = new LongSerializer();
+ try {
+ String version = versionSerializer.deserialize(wrapper);
+ long token = tokenSerializer.deserialize(wrapper);
+ long checkpointedToken = tokenSerializer.deserialize(wrapper);
+ int length = wrapper.readInt();
+ List<T> results = new ArrayList<>(length);
+ for (int i = 0; i < length; i++) {
+ results.add(serializer.deserialize(wrapper));
+ }
+ return new DeserializedResponse<>(version, token, checkpointedToken, results);
+ } catch (IOException e) {
+ throw new RuntimeException("Failed to deserialize collect sink result", e);
+ }
+ }
+
+ public static <T> byte[] serialize(
+ String version,
+ long token,
+ long lastCheckpointId,
+ List<T> results,
+ TypeSerializer<T> serializer) {
+ ByteArrayOutputStream baos = new ByteArrayOutputStream();
+ DataOutputViewStreamWrapper wrapper = new DataOutputViewStreamWrapper(baos);
+ TypeSerializer<String> versionSerializer = new StringSerializer();
+ TypeSerializer<Long> tokenSerializer = new LongSerializer();
Review comment:
ditto
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/collect/CollectCoordinationResponse.java
##########
@@ -0,0 +1,126 @@
+/*
+ * 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.flink.streaming.api.operators.collect;
+
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.api.common.typeutils.base.LongSerializer;
+import org.apache.flink.api.common.typeutils.base.StringSerializer;
+import org.apache.flink.core.memory.DataInputViewStreamWrapper;
+import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
+import org.apache.flink.runtime.operators.coordination.CoordinationResponse;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A {@link CoordinationResponse} from the coordinator containing the required batch or new results
+ * and other necessary information in serialized form.
+ */
+public class CollectCoordinationResponse implements CoordinationResponse {
+
+ private static final long serialVersionUID = 1L;
+
+ private final byte[] bytes;
+
+ public CollectCoordinationResponse(byte[] bytes) {
+ this.bytes = bytes;
+ }
+
+ public <T> DeserializedResponse<T> getDeserializedResponse(TypeSerializer<T> serializer) {
+ ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
+ DataInputViewStreamWrapper wrapper = new DataInputViewStreamWrapper(bais);
+ TypeSerializer<String> versionSerializer = new StringSerializer();
+ TypeSerializer<Long> tokenSerializer = new LongSerializer();
Review comment:
use `LongSerializer.INSTANCE` instead
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/collect/CollectSinkOperatorCoordinator.java
##########
@@ -0,0 +1,212 @@
+/*
+ * 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.flink.streaming.api.operators.collect;
+
+import org.apache.flink.core.memory.DataInputViewStreamWrapper;
+import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
+import org.apache.flink.runtime.jobgraph.OperatorID;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequest;
+import org.apache.flink.runtime.operators.coordination.CoordinationRequestHandler;
+import org.apache.flink.runtime.operators.coordination.CoordinationResponse;
+import org.apache.flink.runtime.operators.coordination.OperatorCoordinator;
+import org.apache.flink.runtime.operators.coordination.OperatorEvent;
+import org.apache.flink.util.Preconditions;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.util.Collections;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+/**
+ * {@link OperatorCoordinator} for {@link CollectSinkFunction}.
+ *
+ * <p>This coordinator only forwards requests and responses from clients and sinks,
+ * it does not store any state in itself.
+ */
+public class CollectSinkOperatorCoordinator implements OperatorCoordinator, CoordinationRequestHandler {
+
+ private static final Logger LOG = LoggerFactory.getLogger(CollectSinkOperatorCoordinator.class);
+
+ private InetSocketAddress address;
+ private Socket socket;
+
+ private ExecutorService executorService;
+
+ @Override
+ public void start() throws Exception {
+ this.executorService = Executors.newFixedThreadPool(1);
Review comment:
give the thread a name by using `Executors.newSingleThreadExecutor(new ExecutorThreadFactory("the name you want"));`
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/collect/CollectCoordinationResponse.java
##########
@@ -0,0 +1,126 @@
+/*
+ * 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.flink.streaming.api.operators.collect;
+
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.api.common.typeutils.base.LongSerializer;
+import org.apache.flink.api.common.typeutils.base.StringSerializer;
+import org.apache.flink.core.memory.DataInputViewStreamWrapper;
+import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
+import org.apache.flink.runtime.operators.coordination.CoordinationResponse;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A {@link CoordinationResponse} from the coordinator containing the required batch or new results
+ * and other necessary information in serialized form.
+ */
+public class CollectCoordinationResponse implements CoordinationResponse {
+
+ private static final long serialVersionUID = 1L;
+
+ private final byte[] bytes;
+
+ public CollectCoordinationResponse(byte[] bytes) {
+ this.bytes = bytes;
+ }
+
+ public <T> DeserializedResponse<T> getDeserializedResponse(TypeSerializer<T> serializer) {
+ ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
+ DataInputViewStreamWrapper wrapper = new DataInputViewStreamWrapper(bais);
+ TypeSerializer<String> versionSerializer = new StringSerializer();
+ TypeSerializer<Long> tokenSerializer = new LongSerializer();
+ try {
+ String version = versionSerializer.deserialize(wrapper);
+ long token = tokenSerializer.deserialize(wrapper);
+ long checkpointedToken = tokenSerializer.deserialize(wrapper);
+ int length = wrapper.readInt();
+ List<T> results = new ArrayList<>(length);
+ for (int i = 0; i < length; i++) {
+ results.add(serializer.deserialize(wrapper));
+ }
+ return new DeserializedResponse<>(version, token, checkpointedToken, results);
+ } catch (IOException e) {
+ throw new RuntimeException("Failed to deserialize collect sink result", e);
+ }
+ }
+
+ public static <T> byte[] serialize(
+ String version,
+ long token,
+ long lastCheckpointId,
+ List<T> results,
+ TypeSerializer<T> serializer) {
+ ByteArrayOutputStream baos = new ByteArrayOutputStream();
+ DataOutputViewStreamWrapper wrapper = new DataOutputViewStreamWrapper(baos);
+ TypeSerializer<String> versionSerializer = new StringSerializer();
+ TypeSerializer<Long> tokenSerializer = new LongSerializer();
+ try {
+ versionSerializer.serialize(version, wrapper);
+ tokenSerializer.serialize(token, wrapper);
+ tokenSerializer.serialize(lastCheckpointId, wrapper);
+ wrapper.writeInt(results.size());
Review comment:
use `ListSerializer`
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/collect/CollectSinkFunction.java
##########
@@ -0,0 +1,367 @@
+/*
+ * 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.flink.streaming.api.operators.collect;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.api.common.accumulators.LongCounter;
+import org.apache.flink.api.common.accumulators.SerializedListAccumulator;
+import org.apache.flink.api.common.functions.RuntimeContext;
+import org.apache.flink.api.common.state.ListState;
+import org.apache.flink.api.common.state.ListStateDescriptor;
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.configuration.TaskManagerOptions;
+import org.apache.flink.core.memory.DataInputViewStreamWrapper;
+import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
+import org.apache.flink.runtime.operators.coordination.OperatorEventGateway;
+import org.apache.flink.runtime.state.FunctionInitializationContext;
+import org.apache.flink.runtime.state.FunctionSnapshotContext;
+import org.apache.flink.streaming.api.checkpoint.CheckpointedFunction;
+import org.apache.flink.streaming.api.functions.sink.RichSinkFunction;
+import org.apache.flink.streaming.api.operators.StreamingRuntimeContext;
+import org.apache.flink.streaming.runtime.tasks.StreamTask;
+import org.apache.flink.util.Preconditions;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.net.UnknownHostException;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.UUID;
+import java.util.concurrent.locks.Condition;
+import java.util.concurrent.locks.ReentrantLock;
+
+/**
+ * A sink function that collects query results and sends them back to the client.
+ *
+ * <p>This sink works by limiting the number of results buffered in it (can be configured) so
+ * that when the buffer is full, it back-pressures the job until the client consumes some results.
+ *
+ * <p>NOTE: When using this sink, make sure that its parallelism is 1, and make sure that it is used
+ * in a {@link StreamTask}.
+ *
+ * @param <IN> type of results to be written into the sink.
+ */
+@Internal
+public class CollectSinkFunction<IN> extends RichSinkFunction<IN> implements CheckpointedFunction {
+
+ private static final Logger LOG = LoggerFactory.getLogger(CollectSinkFunction.class);
+
+ private final TypeSerializer<IN> serializer;
+ private final LinkedList<IN> bufferedResults;
+ private final int maxResultsPerBatch;
+ private final int maxResultsBuffered;
+ private final String finalResultListAccumulatorName;
+ private final String finalResultTokenAccumulatorName;
+
+ private final ReentrantLock bufferedResultsLock;
+ private final Condition bufferNotFullCondition;
+
+ private OperatorEventGateway eventGateway;
+
+ private String version;
+ private long firstBufferedResultToken;
+ private long lastCheckpointId;
+ private ServerThread serverThread;
+
+ private ListState<IN> bufferedResultsState;
+ private ListState<Long> firstBufferedResultTokenState;
+ private ListState<Long> lastCheckpointIdState;
Review comment:
mark all `runtime generated` fields with `transient`, this would reduce the serialization cost when sending this function from client to server
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