Examples with ComponentLifecycle org.apache.nifi.web.util.ComponentLifecycle used on opensource projects

Example 1 with ComponentLifecycle

use of org.apache.nifi.web.util.ComponentLifecycle in project nifi by apache.

the class VersionsResource method updateFlowVersion.

private VersionControlInformationEntity updateFlowVersion(final String groupId, final ComponentLifecycle componentLifecycle, final URI exampleUri, final Set<AffectedComponentEntity> affectedComponents, final NiFiUser user, final boolean replicateRequest, final Revision revision, final VersionControlInformationEntity requestEntity, final VersionedFlowSnapshot flowSnapshot, final AsynchronousWebRequest<VersionControlInformationEntity> asyncRequest, final String idGenerationSeed, final boolean verifyNotModified, final boolean updateDescendantVersionedFlows) throws LifecycleManagementException, ResumeFlowException {
    // Steps 6-7: Determine which components must be stopped and stop them.
    final Set<String> stoppableReferenceTypes = new HashSet<>();
    stoppableReferenceTypes.add(AffectedComponentDTO.COMPONENT_TYPE_PROCESSOR);
    stoppableReferenceTypes.add(AffectedComponentDTO.COMPONENT_TYPE_REMOTE_INPUT_PORT);
    stoppableReferenceTypes.add(AffectedComponentDTO.COMPONENT_TYPE_REMOTE_OUTPUT_PORT);
    stoppableReferenceTypes.add(AffectedComponentDTO.COMPONENT_TYPE_INPUT_PORT);
    stoppableReferenceTypes.add(AffectedComponentDTO.COMPONENT_TYPE_OUTPUT_PORT);
    final Set<AffectedComponentEntity> runningComponents = affectedComponents.stream().filter(dto -> stoppableReferenceTypes.contains(dto.getComponent().getReferenceType())).filter(dto -> "Running".equalsIgnoreCase(dto.getComponent().getState())).collect(Collectors.toSet());
    logger.info("Stopping {} Processors", runningComponents.size());
    final CancellableTimedPause stopComponentsPause = new CancellableTimedPause(250, Long.MAX_VALUE, TimeUnit.MILLISECONDS);
    asyncRequest.setCancelCallback(stopComponentsPause::cancel);
    componentLifecycle.scheduleComponents(exampleUri, user, groupId, runningComponents, ScheduledState.STOPPED, stopComponentsPause);
    if (asyncRequest.isCancelled()) {
        return null;
    }
    asyncRequest.update(new Date(), "Disabling Affected Controller Services", 20);
    // Steps 8-9. Disable enabled controller services that are affected
    final Set<AffectedComponentEntity> enabledServices = affectedComponents.stream().filter(dto -> AffectedComponentDTO.COMPONENT_TYPE_CONTROLLER_SERVICE.equals(dto.getComponent().getReferenceType())).filter(dto -> "Enabled".equalsIgnoreCase(dto.getComponent().getState())).collect(Collectors.toSet());
    logger.info("Disabling {} Controller Services", enabledServices.size());
    final CancellableTimedPause disableServicesPause = new CancellableTimedPause(250, Long.MAX_VALUE, TimeUnit.MILLISECONDS);
    asyncRequest.setCancelCallback(disableServicesPause::cancel);
    componentLifecycle.activateControllerServices(exampleUri, user, groupId, enabledServices, ControllerServiceState.DISABLED, disableServicesPause);
    if (asyncRequest.isCancelled()) {
        return null;
    }
    asyncRequest.update(new Date(), "Updating Flow", 40);
    logger.info("Updating Process Group with ID {} to version {} of the Versioned Flow", groupId, flowSnapshot.getSnapshotMetadata().getVersion());
    // by replicating a PUT to /nifi-api/versions/process-groups/{groupId}
    try {
        if (replicateRequest) {
            final URI updateUri;
            try {
                updateUri = new URI(exampleUri.getScheme(), exampleUri.getUserInfo(), exampleUri.getHost(), exampleUri.getPort(), "/nifi-api/versions/process-groups/" + groupId, null, exampleUri.getFragment());
            } catch (URISyntaxException e) {
                throw new RuntimeException(e);
            }
            final Map<String, String> headers = new HashMap<>();
            headers.put("content-type", MediaType.APPLICATION_JSON);
            final VersionedFlowSnapshotEntity snapshotEntity = new VersionedFlowSnapshotEntity();
            snapshotEntity.setProcessGroupRevision(dtoFactory.createRevisionDTO(revision));
            snapshotEntity.setRegistryId(requestEntity.getVersionControlInformation().getRegistryId());
            snapshotEntity.setVersionedFlow(flowSnapshot);
            snapshotEntity.setUpdateDescendantVersionedFlows(updateDescendantVersionedFlows);
            final NodeResponse clusterResponse;
            try {
                logger.debug("Replicating PUT request to {} for user {}", updateUri, user);
                if (getReplicationTarget() == ReplicationTarget.CLUSTER_NODES) {
                    clusterResponse = getRequestReplicator().replicate(user, HttpMethod.PUT, updateUri, snapshotEntity, headers).awaitMergedResponse();
                } else {
                    clusterResponse = getRequestReplicator().forwardToCoordinator(getClusterCoordinatorNode(), user, HttpMethod.PUT, updateUri, snapshotEntity, headers).awaitMergedResponse();
                }
            } catch (final InterruptedException ie) {
                logger.warn("Interrupted while replicating PUT request to {} for user {}", updateUri, user);
                Thread.currentThread().interrupt();
                throw new LifecycleManagementException("Interrupted while updating flows across cluster", ie);
            }
            final int updateFlowStatus = clusterResponse.getStatus();
            if (updateFlowStatus != Status.OK.getStatusCode()) {
                final String explanation = getResponseEntity(clusterResponse, String.class);
                logger.error("Failed to update flow across cluster when replicating PUT request to {} for user {}. Received {} response with explanation: {}", updateUri, user, updateFlowStatus, explanation);
                throw new LifecycleManagementException("Failed to update Flow on all nodes in cluster due to " + explanation);
            }
        } else {
            // Step 10: Ensure that if any connection exists in the flow and does not exist in the proposed snapshot,
            // that it has no data in it. Ensure that no Input Port was removed, unless it currently has no incoming connections.
            // Ensure that no Output Port was removed, unless it currently has no outgoing connections.
            serviceFacade.verifyCanUpdate(groupId, flowSnapshot, true, verifyNotModified);
            // Step 11-12. Update Process Group to the new flow and update variable registry with any Variables that were added or removed
            final VersionControlInformationDTO requestVci = requestEntity.getVersionControlInformation();
            final Bucket bucket = flowSnapshot.getBucket();
            final VersionedFlow flow = flowSnapshot.getFlow();
            final VersionedFlowSnapshotMetadata metadata = flowSnapshot.getSnapshotMetadata();
            final VersionControlInformationDTO vci = new VersionControlInformationDTO();
            vci.setBucketId(metadata.getBucketIdentifier());
            vci.setBucketName(bucket.getName());
            vci.setFlowDescription(flow.getDescription());
            vci.setFlowId(flow.getIdentifier());
            vci.setFlowName(flow.getName());
            vci.setGroupId(groupId);
            vci.setRegistryId(requestVci.getRegistryId());
            vci.setRegistryName(serviceFacade.getFlowRegistryName(requestVci.getRegistryId()));
            vci.setVersion(metadata.getVersion());
            vci.setState(flowSnapshot.isLatest() ? VersionedFlowState.UP_TO_DATE.name() : VersionedFlowState.STALE.name());
            serviceFacade.updateProcessGroupContents(user, revision, groupId, vci, flowSnapshot, idGenerationSeed, verifyNotModified, false, updateDescendantVersionedFlows);
        }
    } finally {
        if (!asyncRequest.isCancelled()) {
            if (logger.isDebugEnabled()) {
                logger.debug("Re-Enabling {} Controller Services: {}", enabledServices.size(), enabledServices);
            }
            asyncRequest.update(new Date(), "Re-Enabling Controller Services", 60);
            // Step 13. Re-enable all disabled controller services
            final CancellableTimedPause enableServicesPause = new CancellableTimedPause(250, Long.MAX_VALUE, TimeUnit.MILLISECONDS);
            asyncRequest.setCancelCallback(enableServicesPause::cancel);
            final Set<AffectedComponentEntity> servicesToEnable = getUpdatedEntities(enabledServices, user);
            logger.info("Successfully updated flow; re-enabling {} Controller Services", servicesToEnable.size());
            try {
                componentLifecycle.activateControllerServices(exampleUri, user, groupId, servicesToEnable, ControllerServiceState.ENABLED, enableServicesPause);
            } catch (final IllegalStateException ise) {
                // a more intelligent error message as to exactly what happened, rather than indicate that the flow could not be updated.
                throw new ResumeFlowException("Failed to re-enable Controller Services because " + ise.getMessage(), ise);
            }
        }
        if (!asyncRequest.isCancelled()) {
            if (logger.isDebugEnabled()) {
                logger.debug("Restart {} Processors: {}", runningComponents.size(), runningComponents);
            }
            asyncRequest.update(new Date(), "Restarting Processors", 80);
            // Step 14. Restart all components
            final Set<AffectedComponentEntity> componentsToStart = getUpdatedEntities(runningComponents, user);
            // If there are any Remote Group Ports that are supposed to be started and have no connections, we want to remove those from our Set.
            // This will happen if the Remote Group Port is transmitting when the version change happens but the new flow version does not have
            // a connection to the port. In such a case, the Port still is included in the Updated Entities because we do not remove them
            // when updating the flow (they are removed in the background).
            final Set<AffectedComponentEntity> avoidStarting = new HashSet<>();
            for (final AffectedComponentEntity componentEntity : componentsToStart) {
                final AffectedComponentDTO componentDto = componentEntity.getComponent();
                final String referenceType = componentDto.getReferenceType();
                if (!AffectedComponentDTO.COMPONENT_TYPE_REMOTE_INPUT_PORT.equals(referenceType) && !AffectedComponentDTO.COMPONENT_TYPE_REMOTE_OUTPUT_PORT.equals(referenceType)) {
                    continue;
                }
                boolean startComponent;
                try {
                    startComponent = serviceFacade.isRemoteGroupPortConnected(componentDto.getProcessGroupId(), componentDto.getId());
                } catch (final ResourceNotFoundException rnfe) {
                    // Could occur if RPG is refreshed at just the right time.
                    startComponent = false;
                }
                // rather than removing the component here, because doing so would result in a ConcurrentModificationException.
                if (!startComponent) {
                    avoidStarting.add(componentEntity);
                }
            }
            componentsToStart.removeAll(avoidStarting);
            final CancellableTimedPause startComponentsPause = new CancellableTimedPause(250, Long.MAX_VALUE, TimeUnit.MILLISECONDS);
            asyncRequest.setCancelCallback(startComponentsPause::cancel);
            logger.info("Restarting {} Processors", componentsToStart.size());
            try {
                componentLifecycle.scheduleComponents(exampleUri, user, groupId, componentsToStart, ScheduledState.RUNNING, startComponentsPause);
            } catch (final IllegalStateException ise) {
                // a more intelligent error message as to exactly what happened, rather than indicate that the flow could not be updated.
                throw new ResumeFlowException("Failed to restart components because " + ise.getMessage(), ise);
            }
        }
    }
    asyncRequest.setCancelCallback(null);
    if (asyncRequest.isCancelled()) {
        return null;
    }
    asyncRequest.update(new Date(), "Complete", 100);
    return serviceFacade.getVersionControlInformation(groupId);
}

Example 2 with ComponentLifecycle

use of org.apache.nifi.web.util.ComponentLifecycle in project nifi by apache.

the class VersionsResource method initiateVersionControlUpdate.

@POST
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
@Path("update-requests/process-groups/{id}")
@ApiOperation(value = "Initiate the Update Request of a Process Group with the given ID", response = VersionedFlowUpdateRequestEntity.class, notes = "For a Process Group that is already under Version Control, this will initiate the action of changing " + "from a specific version of the flow in the Flow Registry to a different version of the flow. This can be a lengthy " + "process, as it will stop any Processors and disable any Controller Services necessary to perform the action and then restart them. As a result, " + "the endpoint will immediately return a VersionedFlowUpdateRequestEntity, and the process of updating the flow will occur " + "asynchronously in the background. The client may then periodically poll the status of the request by issuing a GET request to " + "/versions/update-requests/{requestId}. Once the request is completed, the client is expected to issue a DELETE request to " + "/versions/update-requests/{requestId}. " + NON_GUARANTEED_ENDPOINT, authorizations = { @Authorization(value = "Read - /process-groups/{uuid}"), @Authorization(value = "Write - /process-groups/{uuid}"), @Authorization(value = "Read - /{component-type}/{uuid} - For all encapsulated components"), @Authorization(value = "Write - /{component-type}/{uuid} - For all encapsulated components"), @Authorization(value = "Write - if the template contains any restricted components - /restricted-components") })
@ApiResponses(value = { @ApiResponse(code = 400, message = "NiFi was unable to complete the request because it was invalid. The request should not be retried without modification."), @ApiResponse(code = 401, message = "Client could not be authenticated."), @ApiResponse(code = 403, message = "Client is not authorized to make this request."), @ApiResponse(code = 404, message = "The specified resource could not be found."), @ApiResponse(code = 409, message = "The request was valid but NiFi was not in the appropriate state to process it. Retrying the same request later may be successful.") })
public Response initiateVersionControlUpdate(@ApiParam("The process group id.") @PathParam("id") final String groupId, @ApiParam(value = "The controller service configuration details.", required = true) final VersionControlInformationEntity requestEntity) {
    // Verify the request
    final RevisionDTO revisionDto = requestEntity.getProcessGroupRevision();
    if (revisionDto == null) {
        throw new IllegalArgumentException("Process Group Revision must be specified");
    }
    final VersionControlInformationDTO requestVersionControlInfoDto = requestEntity.getVersionControlInformation();
    if (requestVersionControlInfoDto == null) {
        throw new IllegalArgumentException("Version Control Information must be supplied.");
    }
    if (requestVersionControlInfoDto.getGroupId() == null) {
        throw new IllegalArgumentException("The Process Group ID must be supplied.");
    }
    if (!requestVersionControlInfoDto.getGroupId().equals(groupId)) {
        throw new IllegalArgumentException("The Process Group ID in the request body does not match the Process Group ID of the requested resource.");
    }
    if (requestVersionControlInfoDto.getBucketId() == null) {
        throw new IllegalArgumentException("The Bucket ID must be supplied.");
    }
    if (requestVersionControlInfoDto.getFlowId() == null) {
        throw new IllegalArgumentException("The Flow ID must be supplied.");
    }
    if (requestVersionControlInfoDto.getRegistryId() == null) {
        throw new IllegalArgumentException("The Registry ID must be supplied.");
    }
    if (requestVersionControlInfoDto.getVersion() == null) {
        throw new IllegalArgumentException("The Version of the flow must be supplied.");
    }
    // We will perform the updating of the Versioned Flow in a background thread because it can be a long-running process.
    // In order to do this, we will need some parameters that are only available as Thread-Local variables to the current
    // thread, so we will gather the values for these parameters up front.
    final boolean replicateRequest = isReplicateRequest();
    final ComponentLifecycle componentLifecycle = replicateRequest ? clusterComponentLifecycle : localComponentLifecycle;
    final NiFiUser user = NiFiUserUtils.getNiFiUser();
    // Workflow for this process:
    // 0. Obtain the versioned flow snapshot to use for the update
    // a. Contact registry to download the desired version.
    // b. Get Variable Registry of this Process Group and all ancestor groups
    // c. Perform diff to find any new variables
    // d. Get Variable Registry of any child Process Group in the versioned flow
    // e. Perform diff to find any new variables
    // f. Prompt user to fill in values for all new variables
    // 1. Determine which components would be affected (and are enabled/running)
    // a. Component itself is modified in some way, other than position changing.
    // b. Source and Destination of any Connection that is modified.
    // c. Any Processor or Controller Service that references a Controller Service that is modified.
    // 2. Verify READ and WRITE permissions for user, for every component.
    // 3. Verify that all components in the snapshot exist on all nodes (i.e., the NAR exists)?
    // 4. Verify that Process Group is already under version control. If not, must start Version Control instead of updateFlow
    // 5. Verify that Process Group is not 'dirty'.
    // 6. Stop all Processors, Funnels, Ports that are affected.
    // 7. Wait for all of the components to finish stopping.
    // 8. Disable all Controller Services that are affected.
    // 9. Wait for all Controller Services to finish disabling.
    // 10. Ensure that if any connection was deleted, that it has no data in it. Ensure that no Input Port
    // was removed, unless it currently has no incoming connections. Ensure that no Output Port was removed,
    // unless it currently has no outgoing connections. Checking ports & connections could be done before
    // stopping everything, but removal of Connections cannot.
    // 11. Update variable registry to include new variables
    // (only new variables so don't have to worry about affected components? Or do we need to in case a processor
    // is already referencing the variable? In which case we need to include the affected components above in the
    // Set of affected components before stopping/disabling.).
    // 12. Update components in the Process Group; update Version Control Information.
    // 13. Re-Enable all affected Controller Services that were not removed.
    // 14. Re-Start all Processors, Funnels, Ports that are affected and not removed.
    // Step 0: Get the Versioned Flow Snapshot from the Flow Registry
    final VersionedFlowSnapshot flowSnapshot = serviceFacade.getVersionedFlowSnapshot(requestEntity.getVersionControlInformation(), true);
    // The flow in the registry may not contain the same versions of components that we have in our flow. As a result, we need to update
    // the flow snapshot to contain compatible bundles.
    BundleUtils.discoverCompatibleBundles(flowSnapshot.getFlowContents());
    // Step 1: Determine which components will be affected by updating the version
    final Set<AffectedComponentEntity> affectedComponents = serviceFacade.getComponentsAffectedByVersionChange(groupId, flowSnapshot, user);
    // build a request wrapper
    final InitiateChangeFlowVersionRequestWrapper requestWrapper = new InitiateChangeFlowVersionRequestWrapper(requestEntity, componentLifecycle, getAbsolutePath(), affectedComponents, replicateRequest, flowSnapshot);
    final Revision requestRevision = getRevision(requestEntity.getProcessGroupRevision(), groupId);
    return withWriteLock(serviceFacade, requestWrapper, requestRevision, lookup -> {
        // Step 2: Verify READ and WRITE permissions for user, for every component.
        final ProcessGroupAuthorizable groupAuthorizable = lookup.getProcessGroup(groupId);
        authorizeProcessGroup(groupAuthorizable, authorizer, lookup, RequestAction.READ, true, false, true, true);
        authorizeProcessGroup(groupAuthorizable, authorizer, lookup, RequestAction.WRITE, true, false, true, true);
        final VersionedProcessGroup groupContents = flowSnapshot.getFlowContents();
        final Set<ConfigurableComponent> restrictedComponents = FlowRegistryUtils.getRestrictedComponents(groupContents);
        restrictedComponents.forEach(restrictedComponent -> {
            final ComponentAuthorizable restrictedComponentAuthorizable = lookup.getConfigurableComponent(restrictedComponent);
            authorizeRestrictions(authorizer, restrictedComponentAuthorizable);
        });
    }, () -> {
        // Step 3: Verify that all components in the snapshot exist on all nodes
        // Step 4: Verify that Process Group is already under version control. If not, must start Version Control instead of updating flow
        // Step 5: Verify that Process Group is not 'dirty'
        serviceFacade.verifyCanUpdate(groupId, flowSnapshot, false, true);
    }, (revision, wrapper) -> {
        final String idGenerationSeed = getIdGenerationSeed().orElse(null);
        // Create an asynchronous request that will occur in the background, because this request may
        // result in stopping components, which can take an indeterminate amount of time.
        final String requestId = UUID.randomUUID().toString();
        final AsynchronousWebRequest<VersionControlInformationEntity> request = new StandardAsynchronousWebRequest<>(requestId, groupId, user, "Stopping Affected Processors");
        // Submit the request to be performed in the background
        final Consumer<AsynchronousWebRequest<VersionControlInformationEntity>> updateTask = vcur -> {
            try {
                final VersionControlInformationEntity updatedVersionControlEntity = updateFlowVersion(groupId, wrapper.getComponentLifecycle(), wrapper.getExampleUri(), wrapper.getAffectedComponents(), user, wrapper.isReplicateRequest(), revision, wrapper.getVersionControlInformationEntity(), wrapper.getFlowSnapshot(), request, idGenerationSeed, true, true);
                vcur.markComplete(updatedVersionControlEntity);
            } catch (final ResumeFlowException rfe) {
                // Treat ResumeFlowException differently because we don't want to include a message that we couldn't update the flow
                // since in this case the flow was successfully updated - we just couldn't re-enable the components.
                logger.error(rfe.getMessage(), rfe);
                vcur.setFailureReason(rfe.getMessage());
            } catch (final Exception e) {
                logger.error("Failed to update flow to new version", e);
                vcur.setFailureReason("Failed to update flow to new version due to " + e);
            }
        };
        requestManager.submitRequest("update-requests", requestId, request, updateTask);
        // Generate the response.
        final VersionedFlowUpdateRequestDTO updateRequestDto = new VersionedFlowUpdateRequestDTO();
        updateRequestDto.setComplete(request.isComplete());
        updateRequestDto.setFailureReason(request.getFailureReason());
        updateRequestDto.setLastUpdated(request.getLastUpdated());
        updateRequestDto.setProcessGroupId(groupId);
        updateRequestDto.setRequestId(requestId);
        updateRequestDto.setUri(generateResourceUri("versions", "update-requests", requestId));
        updateRequestDto.setPercentCompleted(request.getPercentComplete());
        updateRequestDto.setState(request.getState());
        final VersionedFlowUpdateRequestEntity updateRequestEntity = new VersionedFlowUpdateRequestEntity();
        final RevisionDTO groupRevision = serviceFacade.getProcessGroup(groupId).getRevision();
        updateRequestEntity.setProcessGroupRevision(groupRevision);
        updateRequestEntity.setRequest(updateRequestDto);
        return generateOkResponse(updateRequestEntity).build();
    });
}

Example 3 with ComponentLifecycle

use of org.apache.nifi.web.util.ComponentLifecycle in project nifi by apache.

the class VersionsResource method initiateRevertFlowVersion.

@POST
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
@Path("revert-requests/process-groups/{id}")
@ApiOperation(value = "Initiate the Revert Request of a Process Group with the given ID", response = VersionedFlowUpdateRequestEntity.class, notes = "For a Process Group that is already under Version Control, this will initiate the action of reverting " + "any local changes that have been made to the Process Group since it was last synchronized with the Flow Registry. This will result in the " + "flow matching the Versioned Flow that exists in the Flow Registry. This can be a lengthy " + "process, as it will stop any Processors and disable any Controller Services necessary to perform the action and then restart them. As a result, " + "the endpoint will immediately return a VersionedFlowUpdateRequestEntity, and the process of updating the flow will occur " + "asynchronously in the background. The client may then periodically poll the status of the request by issuing a GET request to " + "/versions/revert-requests/{requestId}. Once the request is completed, the client is expected to issue a DELETE request to " + "/versions/revert-requests/{requestId}. " + NON_GUARANTEED_ENDPOINT, authorizations = { @Authorization(value = "Read - /process-groups/{uuid}"), @Authorization(value = "Write - /process-groups/{uuid}"), @Authorization(value = "Read - /{component-type}/{uuid} - For all encapsulated components"), @Authorization(value = "Write - /{component-type}/{uuid} - For all encapsulated components"), @Authorization(value = "Write - if the template contains any restricted components - /restricted-components") })
@ApiResponses(value = { @ApiResponse(code = 400, message = "NiFi was unable to complete the request because it was invalid. The request should not be retried without modification."), @ApiResponse(code = 401, message = "Client could not be authenticated."), @ApiResponse(code = 403, message = "Client is not authorized to make this request."), @ApiResponse(code = 404, message = "The specified resource could not be found."), @ApiResponse(code = 409, message = "The request was valid but NiFi was not in the appropriate state to process it. Retrying the same request later may be successful.") })
public Response initiateRevertFlowVersion(@ApiParam("The process group id.") @PathParam("id") final String groupId, @ApiParam(value = "The controller service configuration details.", required = true) final VersionControlInformationEntity requestEntity) throws IOException {
    // Verify the request
    final RevisionDTO revisionDto = requestEntity.getProcessGroupRevision();
    if (revisionDto == null) {
        throw new IllegalArgumentException("Process Group Revision must be specified");
    }
    final VersionControlInformationDTO requestVersionControlInfoDto = requestEntity.getVersionControlInformation();
    if (requestVersionControlInfoDto == null) {
        throw new IllegalArgumentException("Version Control Information must be supplied.");
    }
    if (requestVersionControlInfoDto.getGroupId() == null) {
        throw new IllegalArgumentException("The Process Group ID must be supplied.");
    }
    if (!requestVersionControlInfoDto.getGroupId().equals(groupId)) {
        throw new IllegalArgumentException("The Process Group ID in the request body does not match the Process Group ID of the requested resource.");
    }
    if (requestVersionControlInfoDto.getBucketId() == null) {
        throw new IllegalArgumentException("The Bucket ID must be supplied.");
    }
    if (requestVersionControlInfoDto.getFlowId() == null) {
        throw new IllegalArgumentException("The Flow ID must be supplied.");
    }
    if (requestVersionControlInfoDto.getRegistryId() == null) {
        throw new IllegalArgumentException("The Registry ID must be supplied.");
    }
    if (requestVersionControlInfoDto.getVersion() == null) {
        throw new IllegalArgumentException("The Version of the flow must be supplied.");
    }
    // We will perform the updating of the Versioned Flow in a background thread because it can be a long-running process.
    // In order to do this, we will need some parameters that are only available as Thread-Local variables to the current
    // thread, so we will gather the values for these parameters up front.
    final boolean replicateRequest = isReplicateRequest();
    final ComponentLifecycle componentLifecycle = replicateRequest ? clusterComponentLifecycle : localComponentLifecycle;
    final NiFiUser user = NiFiUserUtils.getNiFiUser();
    // Step 0: Get the Versioned Flow Snapshot from the Flow Registry
    final VersionedFlowSnapshot flowSnapshot = serviceFacade.getVersionedFlowSnapshot(requestEntity.getVersionControlInformation(), true);
    // The flow in the registry may not contain the same versions of components that we have in our flow. As a result, we need to update
    // the flow snapshot to contain compatible bundles.
    BundleUtils.discoverCompatibleBundles(flowSnapshot.getFlowContents());
    // Step 1: Determine which components will be affected by updating the version
    final Set<AffectedComponentEntity> affectedComponents = serviceFacade.getComponentsAffectedByVersionChange(groupId, flowSnapshot, user);
    // build a request wrapper
    final InitiateChangeFlowVersionRequestWrapper requestWrapper = new InitiateChangeFlowVersionRequestWrapper(requestEntity, componentLifecycle, getAbsolutePath(), affectedComponents, replicateRequest, flowSnapshot);
    final Revision requestRevision = getRevision(requestEntity.getProcessGroupRevision(), groupId);
    return withWriteLock(serviceFacade, requestWrapper, requestRevision, lookup -> {
        // Step 2: Verify READ and WRITE permissions for user, for every component.
        final ProcessGroupAuthorizable groupAuthorizable = lookup.getProcessGroup(groupId);
        authorizeProcessGroup(groupAuthorizable, authorizer, lookup, RequestAction.READ, true, false, true, true);
        authorizeProcessGroup(groupAuthorizable, authorizer, lookup, RequestAction.WRITE, true, false, true, true);
        final VersionedProcessGroup groupContents = flowSnapshot.getFlowContents();
        final Set<ConfigurableComponent> restrictedComponents = FlowRegistryUtils.getRestrictedComponents(groupContents);
        restrictedComponents.forEach(restrictedComponent -> {
            final ComponentAuthorizable restrictedComponentAuthorizable = lookup.getConfigurableComponent(restrictedComponent);
            authorizeRestrictions(authorizer, restrictedComponentAuthorizable);
        });
    }, () -> {
        // Step 3: Verify that all components in the snapshot exist on all nodes
        // Step 4: Verify that Process Group is already under version control. If not, must start Version Control instead of updating flow
        serviceFacade.verifyCanRevertLocalModifications(groupId, flowSnapshot);
    }, (revision, wrapper) -> {
        final VersionControlInformationEntity versionControlInformationEntity = wrapper.getVersionControlInformationEntity();
        final VersionControlInformationDTO versionControlInformationDTO = versionControlInformationEntity.getVersionControlInformation();
        // Ensure that the information passed in is correct
        final VersionControlInformationEntity currentVersionEntity = serviceFacade.getVersionControlInformation(groupId);
        if (currentVersionEntity == null) {
            throw new IllegalStateException("Process Group cannot be reverted to the previous version of the flow because Process Group is not under Version Control.");
        }
        final VersionControlInformationDTO currentVersion = currentVersionEntity.getVersionControlInformation();
        if (!currentVersion.getBucketId().equals(versionControlInformationDTO.getBucketId())) {
            throw new IllegalArgumentException("The Version Control Information provided does not match the flow that the Process Group is currently synchronized with.");
        }
        if (!currentVersion.getFlowId().equals(versionControlInformationDTO.getFlowId())) {
            throw new IllegalArgumentException("The Version Control Information provided does not match the flow that the Process Group is currently synchronized with.");
        }
        if (!currentVersion.getRegistryId().equals(versionControlInformationDTO.getRegistryId())) {
            throw new IllegalArgumentException("The Version Control Information provided does not match the flow that the Process Group is currently synchronized with.");
        }
        if (!currentVersion.getVersion().equals(versionControlInformationDTO.getVersion())) {
            throw new IllegalArgumentException("The Version Control Information provided does not match the flow that the Process Group is currently synchronized with.");
        }
        final String idGenerationSeed = getIdGenerationSeed().orElse(null);
        // Create an asynchronous request that will occur in the background, because this request may
        // result in stopping components, which can take an indeterminate amount of time.
        final String requestId = UUID.randomUUID().toString();
        final AsynchronousWebRequest<VersionControlInformationEntity> request = new StandardAsynchronousWebRequest<>(requestId, groupId, user, "Stopping Affected Processors");
        // Submit the request to be performed in the background
        final Consumer<AsynchronousWebRequest<VersionControlInformationEntity>> updateTask = vcur -> {
            try {
                final VersionControlInformationEntity updatedVersionControlEntity = updateFlowVersion(groupId, wrapper.getComponentLifecycle(), wrapper.getExampleUri(), wrapper.getAffectedComponents(), user, wrapper.isReplicateRequest(), revision, versionControlInformationEntity, wrapper.getFlowSnapshot(), request, idGenerationSeed, false, true);
                vcur.markComplete(updatedVersionControlEntity);
            } catch (final ResumeFlowException rfe) {
                // Treat ResumeFlowException differently because we don't want to include a message that we couldn't update the flow
                // since in this case the flow was successfully updated - we just couldn't re-enable the components.
                logger.error(rfe.getMessage(), rfe);
                vcur.setFailureReason(rfe.getMessage());
            } catch (final Exception e) {
                logger.error("Failed to update flow to new version", e);
                vcur.setFailureReason("Failed to update flow to new version due to " + e.getMessage());
            }
        };
        requestManager.submitRequest("revert-requests", requestId, request, updateTask);
        // Generate the response.
        final VersionedFlowUpdateRequestDTO updateRequestDto = new VersionedFlowUpdateRequestDTO();
        updateRequestDto.setComplete(request.isComplete());
        updateRequestDto.setFailureReason(request.getFailureReason());
        updateRequestDto.setLastUpdated(request.getLastUpdated());
        updateRequestDto.setProcessGroupId(groupId);
        updateRequestDto.setRequestId(requestId);
        updateRequestDto.setState(request.getState());
        updateRequestDto.setPercentCompleted(request.getPercentComplete());
        updateRequestDto.setUri(generateResourceUri("versions", "revert-requests", requestId));
        final VersionedFlowUpdateRequestEntity updateRequestEntity = new VersionedFlowUpdateRequestEntity();
        final RevisionDTO groupRevision = serviceFacade.getProcessGroup(groupId).getRevision();
        updateRequestEntity.setProcessGroupRevision(groupRevision);
        updateRequestEntity.setRequest(updateRequestDto);
        return generateOkResponse(updateRequestEntity).build();
    });
}