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From GitBox <...@apache.org>
Subject [GitHub] jerrypeng commented on a change in pull request #1950: Enable Pulsar Functions to be deployed on a kubernetes cluster
Date Mon, 01 Oct 2018 17:40:11 GMT
jerrypeng 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_r221695347
 
 

 ##########
 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));
+
+        final Response response =
+                appsClient.createNamespacedStatefulSetCall(jobNamespace, statefulSet, null,
+                        null, null).execute();
+        if (!response.isSuccessful()) {
+            if (response.code() == HTTP_CONFLICT) {
+                log.warn("Kubernetes job already running");
+            } else {
+                log.error("Error creating k8 job:- : " + response.message());
+                // construct a message based on the k8s api server response
+                throw new IllegalStateException(response.message());
+            }
+        } else {
+            log.info("Job Submitted Successfully");
+        }
+    }
+
+    public void deleteStatefulSet() throws Exception {
+        final V1DeleteOptions options = new V1DeleteOptions();
+        options.setGracePeriodSeconds(0L);
+        options.setPropagationPolicy("Foreground");
+        final Response response = appsClient.deleteNamespacedStatefulSetCall(
+                createJobName(instanceConfig.getFunctionDetails()),
+                jobNamespace, options, null, null, null, null, null, null)
+                .execute();
+
+        if (!response.isSuccessful()) {
+            throw new RuntimeException("Error killing k8 job " + response.message());
+        } else {
+            log.info("Killed Successfully");
+        }
+    }
+
+    public void deleteService() throws Exception {
+        final V1DeleteOptions options = new V1DeleteOptions();
+        options.setGracePeriodSeconds(0L);
+        options.setPropagationPolicy("Foreground");
+        final Response response = coreClient.deleteNamespacedServiceCall(
+                createJobName(instanceConfig.getFunctionDetails()),
+                jobNamespace, options, null, null, null, null, null, null)
+                .execute();
+
+        if (!response.isSuccessful()) {
+            throw new RuntimeException("Error deleting service " + response.message());
+        } else {
+            log.info("Service deleted successfully");
+        }
+    }
+
+    protected List<String> getExecutorCommand() {
+        return Arrays.asList(
+                "sh",
+                "-c",
+                String.join(" ", getDownloadCommand(userCodePkgUrl, originalCodeFileName))
+                        + " && " + setShardIdEnvironmentVariableCommand()
+                        + " && " + String.join(" ", processArgs)
+        );
+    }
+
+    private List<String> getDownloadCommand(String bkPath, String userCodeFilePath)
{
+        return Arrays.asList(
+                pulsarRootDir + "/bin/pulsar-admin",
+                "--admin-url",
+                pulsarAdminUrl,
+                "functions",
+                "download",
+                "--path",
+                bkPath,
+                "--destination-file",
+                userCodeFilePath);
+    }
+
+    private static String setShardIdEnvironmentVariableCommand() {
+        return String.format("%s=${POD_NAME##*-} && echo shardId=${%s}", ENV_SHARD_ID,
ENV_SHARD_ID);
+    }
+
+
+    private V1StatefulSet createStatefulSet() {
+        final String jobName = createJobName(instanceConfig.getFunctionDetails());
+
+        final V1StatefulSet statefulSet = new V1StatefulSet();
+
+        // setup stateful set metadata
+        final V1ObjectMeta objectMeta = new V1ObjectMeta();
+        objectMeta.name(jobName);
+        statefulSet.metadata(objectMeta);
+
+        // create the stateful set spec
+        final V1StatefulSetSpec statefulSetSpec = new V1StatefulSetSpec();
+        statefulSetSpec.serviceName(jobName);
+        statefulSetSpec.setReplicas(instanceConfig.getFunctionDetails().getParallelism());
+
+        // Parallel pod management tells the StatefulSet controller to launch or terminate
+        // all Pods in parallel, and not to wait for Pods to become Running and Ready or
completely
+        // terminated prior to launching or terminating another Pod.
+        statefulSetSpec.setPodManagementPolicy("Parallel");
+
+        // add selector match labels
+        // so the we know which pods to manage
+        final V1LabelSelector selector = new V1LabelSelector();
+        selector.matchLabels(getLabels(instanceConfig.getFunctionDetails()));
+        statefulSetSpec.selector(selector);
+
+        // create a pod template
+        final V1PodTemplateSpec podTemplateSpec = new V1PodTemplateSpec();
+
+        // set up pod meta
+        final V1ObjectMeta templateMetaData = new V1ObjectMeta().labels(getLabels(instanceConfig.getFunctionDetails()));
+        /*
+        TODO:- Figure out the metrics collection later.
+        templateMetaData.annotations(getPrometheusAnnotations());
+        */
+        podTemplateSpec.setMetadata(templateMetaData);
+
+        final List<String> command = getExecutorCommand();
+        podTemplateSpec.spec(getPodSpec(command, instanceConfig.getFunctionDetails().hasResources()
? instanceConfig.getFunctionDetails().getResources() : null));
+
+        statefulSetSpec.setTemplate(podTemplateSpec);
+
+        statefulSet.spec(statefulSetSpec);
+
+        return statefulSet;
+    }
+
+    private Map<String, String> getPrometheusAnnotations() {
+        final Map<String, String> annotations = new HashMap<>();
+        annotations.put("prometheus.io/scrape", "true");
+        annotations.put("prometheus.io/port", "8080");
+        return annotations;
+    }
+
+    private Map<String, String> getLabels(Function.FunctionDetails functionDetails)
{
+        final Map<String, String> labels = new HashMap<>();
+        labels.put("app", createJobName(functionDetails));
+        labels.put("namespace", functionDetails.getNamespace());
+        labels.put("tenant", functionDetails.getTenant());
+        return labels;
+    }
+
+    private V1PodSpec getPodSpec(List<String> instanceCommand, Function.Resources resource)
{
+        final V1PodSpec podSpec = new V1PodSpec();
+
+        // set the termination period to 0 so pods can be deleted quickly
+        podSpec.setTerminationGracePeriodSeconds(0L);
+
+        // set the pod tolerations so pods are rescheduled when nodes go down
+        // https://kubernetes.io/docs/concepts/configuration/taint-and-toleration/#taint-based-evictions
+        podSpec.setTolerations(getTolerations());
+
+        podSpec.containers(Collections.singletonList(
+                getContainer(instanceCommand, resource)));
+
+        return podSpec;
+    }
+
+    private List<V1Toleration> getTolerations() {
+        final List<V1Toleration> tolerations = new ArrayList<>();
+        TOLERATIONS.forEach(t -> {
+            final V1Toleration toleration =
+                    new V1Toleration()
+                            .key(t)
+                            .operator("Exists")
+                            .effect("NoExecute")
+                            .tolerationSeconds(10L);
+            tolerations.add(toleration);
+        });
+
+        return tolerations;
+    }
+
+    private V1Container getContainer(List<String> instanceCommand, Function.Resources
resource) {
+        final V1Container container = new V1Container().name("pulsarfunction");
+
+        // set up the container images
+        container.setImage(pulsarDockerImageName);
+
+        // set up the container command
+        container.setCommand(instanceCommand);
+
+        // setup the environment variables for the container
+        final V1EnvVar envVarPodName = new V1EnvVar();
+        envVarPodName.name("POD_NAME")
+                .valueFrom(new V1EnvVarSource()
+                        .fieldRef(new V1ObjectFieldSelector()
+                                .fieldPath("metadata.name")));
+        container.setEnv(Arrays.asList(envVarPodName));
+
+
+        // set container resources
+        final V1ResourceRequirements resourceRequirements = new V1ResourceRequirements();
+        final Map<String, Quantity> requests = new HashMap<>();
+        requests.put("memory", Quantity.fromString(Long.toString(resource != null &&
resource.getRam() != 0 ? resource.getRam() : 1073741824)));
+        requests.put("cpu", Quantity.fromString(Double.toString(resource != null &&
resource.getCpu() != 0 ? resource.getCpu() : 1)));
+        resourceRequirements.setRequests(requests);
+        container.setResources(resourceRequirements);
+
+        // set container ports
+        container.setPorts(getContainerPorts());
+
+        return container;
+    }
+
+    private List<V1ContainerPort> getContainerPorts() {
+        List<V1ContainerPort> ports = new ArrayList<>();
+        final V1ContainerPort port = new V1ContainerPort();
+        port.setName("grpc");
+        port.setContainerPort(GRPC_PORT);
+        ports.add(port);
+        return ports;
+    }
+
+    private static String createJobName(Function.FunctionDetails functionDetails) {
+        return createJobName(functionDetails.getTenant(),
+                functionDetails.getNamespace(),
+                functionDetails.getName());
+    }
+
+    private static String createJobName(String tenant, String namespace, String functionName)
{
 
 Review comment:
   Should we not do some short of mapping of tenant/namespace to some kubernetes namespace?

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