srkukarni commented on a change in pull request #1950: Enable Pulsar Functions to be deployed on a kubernetes cluster URL: https://github.com/apache/pulsar/pull/1950#discussion_r220683422
########## File path: pulsar-functions/runtime/src/main/java/org/apache/pulsar/functions/runtime/KubernetesRuntime.java ########## @@ -0,0 +1,507 @@ +/** + * 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.pulsar.functions.runtime; + +import com.google.common.util.concurrent.FutureCallback; +import com.google.common.util.concurrent.Futures; +import com.google.common.util.concurrent.ListenableFuture; +import com.google.protobuf.Empty; +import com.squareup.okhttp.Response; +import io.grpc.ManagedChannel; +import io.grpc.ManagedChannelBuilder; +import io.kubernetes.client.apis.AppsV1Api; +import io.kubernetes.client.apis.CoreV1Api; +import io.kubernetes.client.custom.Quantity; +import io.kubernetes.client.models.*; +import lombok.Getter; +import lombok.extern.slf4j.Slf4j; +import org.apache.pulsar.functions.instance.AuthenticationConfig; +import org.apache.pulsar.functions.instance.InstanceConfig; +import org.apache.pulsar.functions.proto.Function; +import org.apache.pulsar.functions.proto.InstanceCommunication; +import org.apache.pulsar.functions.proto.InstanceCommunication.FunctionStatus; +import org.apache.pulsar.functions.proto.InstanceControlGrpc; + +import java.util.*; +import java.util.concurrent.CompletableFuture; +import java.util.regex.Matcher; +import java.util.regex.Pattern; + +import static java.net.HttpURLConnection.HTTP_CONFLICT; + +/** + * A function container implemented using java thread. + */ +@Slf4j +class KubernetesRuntime implements Runtime { + + private static final String ENV_SHARD_ID = "SHARD_ID"; + private static final Integer GRPC_PORT = 9093; + public static final Pattern VALID_POD_NAME_REGEX = + Pattern.compile("[a-z0-9]([-a-z0-9]*[a-z0-9])?(\\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*", + Pattern.CASE_INSENSITIVE); + + private final AppsV1Api appsClient; + private final CoreV1Api coreClient; + static final List<String> TOLERATIONS = Collections.unmodifiableList( + Arrays.asList( + "node.kubernetes.io/not-ready", + "node.alpha.kubernetes.io/notReady", + "node.alpha.kubernetes.io/unreachable" + ) + ); + + // The thread that invokes the function + @Getter + private List<String> processArgs; + @Getter + private ManagedChannel[] channel; + private InstanceControlGrpc.InstanceControlFutureStub[] stub; + private InstanceConfig instanceConfig; + private final String jobNamespace; + private final String pulsarDockerImageName; + private final String pulsarRootDir; + private final String userCodePkgUrl; + private final String originalCodeFileName; + private final String pulsarAdminUrl; + private boolean running; + + + KubernetesRuntime(AppsV1Api appsClient, + CoreV1Api coreClient, + String jobNamespace, + String pulsarDockerImageName, + String pulsarRootDir, + InstanceConfig instanceConfig, + String instanceFile, + String logDirectory, + String userCodePkgUrl, + String originalCodeFileName, + String pulsarServiceUrl, + String pulsarAdminUrl, + String stateStorageServiceUrl, + AuthenticationConfig authConfig) throws Exception { + this.appsClient = appsClient; + this.coreClient = coreClient; + this.instanceConfig = instanceConfig; + this.jobNamespace = jobNamespace; + this.pulsarDockerImageName = pulsarDockerImageName; + this.pulsarRootDir = pulsarRootDir; + this.userCodePkgUrl = userCodePkgUrl; + this.originalCodeFileName = originalCodeFileName; + this.pulsarAdminUrl = pulsarAdminUrl; + this.processArgs = RuntimeUtils.composeArgs(instanceConfig, instanceFile, logDirectory, originalCodeFileName, pulsarServiceUrl, stateStorageServiceUrl, + authConfig, "$" + ENV_SHARD_ID, GRPC_PORT, -1l, "conf/log4j2.yaml"); + running = false; + doChecks(instanceConfig.getFunctionDetails()); + } + + /** + * The core logic that initialize the thread container and executes the function + */ + @Override + public void start() throws Exception { + submitService(); + try { + submitStatefulSet(); + } catch (Exception e) { + deleteService(); + } + running = true; + if (channel == null && stub == null) { + channel = new ManagedChannel[instanceConfig.getFunctionDetails().getParallelism()]; + stub = new InstanceControlGrpc.InstanceControlFutureStub[instanceConfig.getFunctionDetails().getParallelism()]; + for (int i = 0; i < instanceConfig.getFunctionDetails().getParallelism(); ++i) { + String address = createJobName(instanceConfig.getFunctionDetails()) + "-" + + i + "." + createJobName(instanceConfig.getFunctionDetails()); + channel[i] = ManagedChannelBuilder.forAddress(address, GRPC_PORT) + .usePlaintext(true) + .build(); + stub[i] = InstanceControlGrpc.newFutureStub(channel[i]); + } + } + } + + @Override + public void join() throws Exception { + // K8 functions never return + this.wait(); + } + + @Override + public void stop() throws Exception { + if (running) { + deleteStatefulSet(); + deleteService(); + } + if (channel != null) { + for (ManagedChannel cn : channel) { + cn.shutdown(); + } + } + channel = null; + stub = null; + running = false; + } + + @Override + public Throwable getDeathException() { + return null; + } + + @Override + public CompletableFuture<FunctionStatus> getFunctionStatus(int instanceId) { + CompletableFuture<FunctionStatus> retval = new CompletableFuture<>(); + if (instanceId < 0 || instanceId >= stub.length) { + if (stub == null) { + retval.completeExceptionally(new RuntimeException("Invalid InstanceId")); + return retval; + } + } + if (stub == null) { + retval.completeExceptionally(new RuntimeException("Not alive")); + return retval; + } + ListenableFuture<FunctionStatus> response = stub[instanceId].getFunctionStatus(Empty.newBuilder().build()); + Futures.addCallback(response, new FutureCallback<FunctionStatus>() { + @Override + public void onFailure(Throwable throwable) { + FunctionStatus.Builder builder = FunctionStatus.newBuilder(); + builder.setRunning(false); + builder.setFailureException(throwable.getMessage()); + retval.complete(builder.build()); + } + + @Override + public void onSuccess(FunctionStatus t) { + retval.complete(t); + } + }); + return retval; + } + + @Override + public CompletableFuture<InstanceCommunication.MetricsData> getAndResetMetrics() { + CompletableFuture<InstanceCommunication.MetricsData> retval = new CompletableFuture<>(); + retval.completeExceptionally(new RuntimeException("Kubernetes Runtime doesnt support getAndReset metrics via rest")); + return retval; + } + + @Override + public CompletableFuture<Void> resetMetrics() { + CompletableFuture<Void> retval = new CompletableFuture<>(); + retval.completeExceptionally(new RuntimeException("Kubernetes Runtime doesnt support resetting metrics via rest")); + return retval; + } + + @Override + public CompletableFuture<InstanceCommunication.MetricsData> getMetrics() { + CompletableFuture<InstanceCommunication.MetricsData> retval = new CompletableFuture<>(); + retval.completeExceptionally(new RuntimeException("Kubernetes Runtime doesnt support getting metrics via rest")); + return retval; + } + + @Override + public boolean isAlive() { + return running; + } + + private void submitService() throws Exception { + final V1Service service = createService(); + log.info("Submitting the following service to k8 " + coreClient.getApiClient().getJSON().serialize(service)); + + final Response response = + coreClient.createNamespacedServiceCall(jobNamespace, service, null, + null, null).execute(); + if (!response.isSuccessful()) { + if (response.code() == HTTP_CONFLICT) { + log.warn("Service already created"); + } else { + log.error("Error creating Service:- : " + response.message()); + // construct a message based on the k8s api server response + throw new IllegalStateException(response.message()); + } + } else { + log.info("Service Created Successfully"); + } + } + + private V1Service createService() { + final String jobName = createJobName(instanceConfig.getFunctionDetails()); + + final V1Service service = new V1Service(); + + // setup stateful set metadata + final V1ObjectMeta objectMeta = new V1ObjectMeta(); + objectMeta.name(jobName); + service.metadata(objectMeta); + + // create the stateful set spec + final V1ServiceSpec serviceSpec = new V1ServiceSpec(); + + serviceSpec.clusterIP("None"); + + final V1ServicePort servicePort = new V1ServicePort(); + servicePort.name("grpc").port(GRPC_PORT).protocol("TCP"); + serviceSpec.addPortsItem(servicePort); + + serviceSpec.selector(getLabels(instanceConfig.getFunctionDetails())); + + service.spec(serviceSpec); + + return service; + } + + private void submitStatefulSet() throws Exception { + final V1StatefulSet statefulSet = createStatefulSet(); + + log.info("Submitting the following spec to k8 " + appsClient.getApiClient().getJSON().serialize(statefulSet)); Review comment: updated ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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