聊聊flink的KvStateRegistryGateway

public interface KvStateRegistryGateway {
​
    /**
     * Notifies that queryable state has been registered.
     *
     * @param jobId identifying the job for which to register a key value state
     * @param jobVertexId JobVertexID the KvState instance belongs to.
     * @param keyGroupRange Key group range the KvState instance belongs to.
     * @param registrationName Name under which the KvState has been registered.
     * @param kvStateId ID of the registered KvState instance.
     * @param kvStateServerAddress Server address where to find the KvState instance.
     * @return Future acknowledge if the key-value state has been registered
     */
    CompletableFuture<Acknowledge> notifyKvStateRegistered(
        final JobID jobId,
        final JobVertexID jobVertexId,
        final KeyGroupRange keyGroupRange,
        final String registrationName,
        final KvStateID kvStateId,
        final InetSocketAddress kvStateServerAddress);
​
    /**
     * Notifies that queryable state has been unregistered.
     *
     * @param jobId identifying the job for which to unregister a key value state
     * @param jobVertexId JobVertexID the KvState instance belongs to.
     * @param keyGroupRange Key group index the KvState instance belongs to.
     * @param registrationName Name under which the KvState has been registered.
     * @return Future acknowledge if the key-value state has been unregistered
     */
    CompletableFuture<Acknowledge> notifyKvStateUnregistered(
        final JobID jobId,
        final JobVertexID jobVertexId,
        final KeyGroupRange keyGroupRange,
        final String registrationName);
}

public class JobMaster extends FencedRpcEndpoint<JobMasterId> implements JobMasterGateway {
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    /** Default names for Flink's distributed components. */
    public static final String JOB_MANAGER_NAME = "jobmanager";
    public static final String ARCHIVE_NAME = "archive";
​
    // ------------------------------------------------------------------------
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    private final JobMasterConfiguration jobMasterConfiguration;
​
    private final ResourceID resourceId;
​
    private final JobGraph jobGraph;
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    private final Time rpcTimeout;
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    private final HighAvailabilityServices highAvailabilityServices;
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    private final BlobServer blobServer;
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    private final JobManagerJobMetricGroupFactory jobMetricGroupFactory;
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    private final HeartbeatManager<AccumulatorReport, Void> taskManagerHeartbeatManager;
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    private final HeartbeatManager<Void, Void> resourceManagerHeartbeatManager;
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    private final ScheduledExecutorService scheduledExecutorService;
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    private final OnCompletionActions jobCompletionActions;
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    private final FatalErrorHandler fatalErrorHandler;
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    private final ClassLoader userCodeLoader;
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    private final SlotPool slotPool;
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    private final SlotPoolGateway slotPoolGateway;
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    private final RestartStrategy restartStrategy;
​
    // --------- BackPressure --------
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    private final BackPressureStatsTracker backPressureStatsTracker;
​
    // --------- ResourceManager --------
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    private final LeaderRetrievalService resourceManagerLeaderRetriever;
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    // --------- TaskManagers --------
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    private final Map<ResourceID, Tuple2<TaskManagerLocation, TaskExecutorGateway>> registeredTaskManagers;
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    // -------- Mutable fields ---------
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    private ExecutionGraph executionGraph;
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    @Nullable
    private JobManagerJobStatusListener jobStatusListener;
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    @Nullable
    private JobManagerJobMetricGroup jobManagerJobMetricGroup;
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    @Nullable
    private String lastInternalSavepoint;
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    @Nullable
    private ResourceManagerAddress resourceManagerAddress;
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    @Nullable
    private ResourceManagerConnection resourceManagerConnection;
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    @Nullable
    private EstablishedResourceManagerConnection establishedResourceManagerConnection;
​
    //......
​
    @Override
    public CompletableFuture<Acknowledge> notifyKvStateRegistered(
            final JobID jobId,
            final JobVertexID jobVertexId,
            final KeyGroupRange keyGroupRange,
            final String registrationName,
            final KvStateID kvStateId,
            final InetSocketAddress kvStateServerAddress) {
        if (jobGraph.getJobID().equals(jobId)) {
            if (log.isDebugEnabled()) {
                log.debug("Key value state registered for job {} under name {}.",
                    jobGraph.getJobID(), registrationName);
            }
​
            try {
                executionGraph.getKvStateLocationRegistry().notifyKvStateRegistered(
                    jobVertexId, keyGroupRange, registrationName, kvStateId, kvStateServerAddress);
​
                return CompletableFuture.completedFuture(Acknowledge.get());
            } catch (Exception e) {
                log.error("Failed to notify KvStateRegistry about registration {}.", registrationName);
                return FutureUtils.completedExceptionally(e);
            }
        } else {
            if (log.isDebugEnabled()) {
                log.debug("Notification about key-value state registration for unknown job {} received.", jobId);
            }
            return FutureUtils.completedExceptionally(new FlinkJobNotFoundException(jobId));
        }
    }
​
    @Override
    public CompletableFuture<Acknowledge> notifyKvStateUnregistered(
            JobID jobId,
            JobVertexID jobVertexId,
            KeyGroupRange keyGroupRange,
            String registrationName) {
        if (jobGraph.getJobID().equals(jobId)) {
            if (log.isDebugEnabled()) {
                log.debug("Key value state unregistered for job {} under name {}.",
                    jobGraph.getJobID(), registrationName);
            }
​
            try {
                executionGraph.getKvStateLocationRegistry().notifyKvStateUnregistered(
                    jobVertexId, keyGroupRange, registrationName);
​
                return CompletableFuture.completedFuture(Acknowledge.get());
            } catch (Exception e) {
                log.error("Failed to notify KvStateRegistry about registration {}.", registrationName, e);
                return FutureUtils.completedExceptionally(e);
            }
        } else {
            if (log.isDebugEnabled()) {
                log.debug("Notification about key-value state deregistration for unknown job {} received.", jobId);
            }
            return FutureUtils.completedExceptionally(new FlinkJobNotFoundException(jobId));
        }
    }
​
    //......
}

public class KvStateLocationRegistry {
​
    /** JobID this coordinator belongs to. */
    private final JobID jobId;
​
    /** Job vertices for determining parallelism per key. */
    private final Map<JobVertexID, ExecutionJobVertex> jobVertices;
​
    /**
     * Location info keyed by registration name. The name needs to be unique
     * per JobID, i.e. two operators cannot register KvState with the same
     * name.
     */
    private final Map<String, KvStateLocation> lookupTable = new HashMap<>();
​
    /**
     * Creates the registry for the job.
     *
     * @param jobId       JobID this coordinator belongs to.
     * @param jobVertices Job vertices map of all vertices of this job.
     */
    public KvStateLocationRegistry(JobID jobId, Map<JobVertexID, ExecutionJobVertex> jobVertices) {
        this.jobId = Preconditions.checkNotNull(jobId, "JobID");
        this.jobVertices = Preconditions.checkNotNull(jobVertices, "Job vertices");
    }
​
    /**
     * Returns the {@link KvStateLocation} for the registered KvState instance
     * or <code>null</code> if no location information is available.
     *
     * @param registrationName Name under which the KvState instance is registered.
     * @return Location information or <code>null</code>.
     */
    public KvStateLocation getKvStateLocation(String registrationName) {
        return lookupTable.get(registrationName);
    }
​
    /**
     * Notifies the registry about a registered KvState instance.
     *
     * @param jobVertexId JobVertexID the KvState instance belongs to
     * @param keyGroupRange Key group range the KvState instance belongs to
     * @param registrationName Name under which the KvState has been registered
     * @param kvStateId ID of the registered KvState instance
     * @param kvStateServerAddress Server address where to find the KvState instance
     *
     * @throws IllegalArgumentException If JobVertexID does not belong to job
     * @throws IllegalArgumentException If state has been registered with same
     * name by another operator.
     * @throws IndexOutOfBoundsException If key group index is out of bounds.
     */
    public void notifyKvStateRegistered(
            JobVertexID jobVertexId,
            KeyGroupRange keyGroupRange,
            String registrationName,
            KvStateID kvStateId,
            InetSocketAddress kvStateServerAddress) {
​
        KvStateLocation location = lookupTable.get(registrationName);
​
        if (location == null) {
            // First registration for this operator, create the location info
            ExecutionJobVertex vertex = jobVertices.get(jobVertexId);
​
            if (vertex != null) {
                int parallelism = vertex.getMaxParallelism();
                location = new KvStateLocation(jobId, jobVertexId, parallelism, registrationName);
                lookupTable.put(registrationName, location);
            } else {
                throw new IllegalArgumentException("Unknown JobVertexID " + jobVertexId);
            }
        }
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        // Duplicated name if vertex IDs don't match
        if (!location.getJobVertexId().equals(jobVertexId)) {
            IllegalStateException duplicate = new IllegalStateException(
                    "Registration name clash. KvState with name '" + registrationName +
                            "' has already been registered by another operator (" +
                            location.getJobVertexId() + ").");
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            ExecutionJobVertex vertex = jobVertices.get(jobVertexId);
            if (vertex != null) {
                vertex.fail(new SuppressRestartsException(duplicate));
            }
​
            throw duplicate;
        }
        location.registerKvState(keyGroupRange, kvStateId, kvStateServerAddress);
    }
​
    /**
     * Notifies the registry about an unregistered KvState instance.
     *
     * @param jobVertexId JobVertexID the KvState instance belongs to
     * @param keyGroupRange Key group index the KvState instance belongs to
     * @param registrationName Name under which the KvState has been registered
     * @throws IllegalArgumentException If another operator registered the state instance
     * @throws IllegalArgumentException If the registration name is not known
     */
    public void notifyKvStateUnregistered(
            JobVertexID jobVertexId,
            KeyGroupRange keyGroupRange,
            String registrationName) {
​
        KvStateLocation location = lookupTable.get(registrationName);
​
        if (location != null) {
            // Duplicate name if vertex IDs don't match
            if (!location.getJobVertexId().equals(jobVertexId)) {
                throw new IllegalArgumentException("Another operator (" +
                        location.getJobVertexId() + ") registered the KvState " +
                        "under '" + registrationName + "'.");
            }
​
            location.unregisterKvState(keyGroupRange);
​
            if (location.getNumRegisteredKeyGroups() == 0) {
                lookupTable.remove(registrationName);
            }
        } else {
            throw new IllegalArgumentException("Unknown registration name '" +
                    registrationName + "'. " + "Probably registration/unregistration race.");
        }
    }
​
}