FROM EVENTING TO JOB PROCESSING Carsten Ziegeler | Adobe Research Switzerland 1
May 10, 2015
FROM EVENT ING TO JOB PROCESS ING
Carsten Ziegeler | Adobe Research Switzerland
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• RnD Team at Adobe Research Switzerland • Co-founder Adobe Granite
• OSGi Core Platform and Enterprise Expert Groups • Member of the ASF
• Current PMC Chair of Apache Sling • Apache Sling, Felix, ACE
• Conference Speaker • Technical Reviewer • Article/Book Author
[email protected] @cziegeler
ABOUT
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OVERVIEW Where to fit in the stack
Discovery
Offloading Workflow Distribution
DAM Ingestion
Sling
Granite
AEM
Job Distribution
Felix OSGi Event Admin
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OVERVIEW Where to fit in the stack
Discovery
Offloading Workflow Distribution
DAM Ingestion
Sling
Granite
AEM
Job Distribution
Felix OSGi Event Admin
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OSGI EVENT ADMIN Publish / Subscribe Model
OSGi Event Admin Component
A
publish deliver
Component X
Component Y
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• OSGi event is a data object with • Topic (hierarchical namespace) • Properties (key-value-pairs)
• Page Event • Topic: com/day/cq/wcm/core/page • Properties: path, change type (add/remove/edit) etc.
OSGI EVENT ADMIN Publish / Subscribe Model
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• Publisher creates event object • Sends event through EventAdmin service • Either sync or async delivery
• Subscriber is an OSGi service (EventHandler) • Service registration properties • Interested topic(s)
• com/day/cq/wcm/core/* • Additional filters (optional)
• (type="add“)
OSGI EVENT ADMIN Publish / Subscribe Model
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• Immediate delivery to available subscribers • No guarantee of delivery • No distributed delivery
OSGI EVENT ADMIN Publish / Subscribe Model
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• Immediate delivery to available subscribers • No guarantee of delivery • No distributed delivery
OSGI EVENT ADMIN Publish / Subscribe Model
Discovery Sling Job Distribution
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OVERVIEW Where to fit in the stack
Discovery
Offloading Workflow Distribution
DAM Ingestion
Sling
Granite
AEM
Job Distribution
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OVERVIEW Where to fit in the stack
Discovery
Offloading Workflow Distribution
DAM Ingestion
Sling
Granite
AEM
Job Distribution New in 5.6.1
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INSTALLAT ION SCENARIOS
Clustered CRX
Single Instance
CRX
Instance 1
Instance 2
Instance 3
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Instance: Unique Id (Sling ID)
TOPOLOGIES I Apache Sling Discovery
Clustered CRX CRX
ID : A ID : X ID : 42 ID : 1
Single Instance
Instance 1
Instance 2
Instance 3
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• Instance: Unique Id (Sling ID) • Cluster: Unique Id and leader
TOPOLOGIES I Apache Sling Discovery
Cluster 99
Cluster 35
Clustered CRX CRX
ID : A ID : X ID : 42 ID : 1
Single Instance
Instance 1
Instance 2
Instance 3
Leader Leader
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• Topology: Set of clusters
TOPOLOGIES I Apache Sling Discovery
Cluster 99
Cluster 35
Clustered CRX CRX
ID : A ID : X ID : 42 ID : 1
Single Instance
Instance 1
Instance 2
Instance 3
Leader Leader
Topology Topology
• Instance: Unique Id (Sling ID) • Cluster: Unique Id and leader
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TOPOLOGIES I Apache Sling Discovery
• Instance: Unique Id (Sling ID) • Cluster: Unique Id and leader
• Topology: Set of clusters
Cluster 99
Clustered CRX CRX
ID : A ID : X ID : 42 ID : 1
Single Instance
Instance 1
Instance 2
Instance 3
Leader
Topology
Cluster 35
Leader
Cluster 99
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• Instance • Sling ID • Optional: Name and description • Belongs to a cluster • Might be the cluster leader • Additional properties which are distributed
• Extensible through own services (PropertyProvider) • E.g. data center, region or enabled job topics
• Cluster • Elects (stable) leader • Stable instance ordering
• TopologyEventListener: receives events on topology changes
TOPOLOGIES I I Apache Sling Discovery
ID : 42
Instance 3
Topology
Leader
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OVERVIEW Where to fit in the stack
Discovery
Offloading Workflow Distribution
DAM Ingestion
Sling
Granite
AEM
Job Distribution
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• Job : Guaranteed processing, exactly once • Exactly one job consumer
• Started by client code, e.g. for replication, workflow... • Job topic • Payload is a serializable map
JOB HANDLING I Apache Sling Job Handling
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• Sling Job Manager handles and distributes jobs • Delivers job to a job consumer… • …and waits for response • Retry and failover
• Notification listeners (fail, retry, success)
JOB HANDLING I Apache Sling Job Handling
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S TART ING / PROCESS ING A JOB I Apache Sling Job Handling
public interface JobConsumer { String PROPERTY_TOPICS = "job.topics"; enum JobResult { OK, FAILED, CANCEL, ASYNC } JobResult process(Job job);}
public interface JobManager { Job addJob(String topic, String optionalName, Map<String, Object> properties); …}
Starting a job
Processing a job
Note: Starting/processing of jobs through Event Admin is deprecated but still supported
New in 5.6.1
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@Component@Service(value={JobConsumer.class})@Property(name=JobConsumer.PROPERTY_TOPICS, value="org/apache/sling/jobs/backup")public class BackupJobConsumer implements JobConsumer { @Override public JobResult process(final Job job) { // do backup return JobResult.OK; }}
S TART ING / PROCESS ING A JOB I I Apache Sling Job Handling
New in 5.6.1
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• New jobs are immediately persisted (resource tree / repository) • Jobs are “pushed” to the processing instance • Processing instances use different queues
• Associated with job topic(s) • Main queue • 0..n custom queues
• For example: replication agent queue or workflow queue
JOB HANDLING I I Apache Sling Job Handling
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• Queue is configurable • Queue is started on demand in own thread
• And stopped if unused for some time • Types
• Ordered queue (eg replication) • Parallel queues: Plain and Topic Round Robin (eg workflow)
• Limit for parallel threads per queue • Number of retries (-1 = endless) • Retry delay • Thread priority
JOB QUEUE Apache Sling Job Handling
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• Job Manager Configuration = Main Queue Configuration • Maximum parallel jobs (15) • Retries (10) • Retry Delay
• Eventing Thread Pool Configuration • Used by all queues • Pool size (35) = Maximum parallel jobs for a single instance
ADDIT IONAL CONFIGURAT IONS Apache Sling Job Handling
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MONITORING – WEB CONSOLE Apache Sling Job Handling
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MONITORING – WEB CONSOLE Apache Sling Job Handling
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• Each instance determines enabled job topics • Derived from Job Consumers (new API required) • Can be whitelisted/blacklisted (in Job Consumer Manager) • Announced through Topology
• Job Distribution depends on enabled job topics and queue type • Potential set of instances derived from topology (enabled job topics) • Ordered : processing on leader only, one job after the other • Parallel: Round robin distribution on all potential instances
• Local cluster instances have preference
• Failover • Instance crash: leader redistributes jobs to available instances
• Leader change taken into account
• On enabled job topics changes: potential redistribution
JOB DISTR IBUT ION Apache Sling Job Handling
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• Scalability in AEM: • DAM Ingestion • Non-Clustered installation requirement
• The term Offloading: • In AEM used for all things job distribution and topology in clustered and non-
clustered installations, e.g. ‘Offloading Browser’ • More technically it’s ‘only’ a little add-on in Granite to Sling Job Distribution
for handling non-clustered installations
WHY OFFLOADING
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OVERVIEW Where to fit in the stack
Discovery
Offloading Workflow Distribution
DAM Ingestion
Sling
Granite
AEM
Job Distribution
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OVERVIEW Where to fit in the stack
Discovery
Offloading Workflow Distribution
DAM Ingestion
Sling
Granite
AEM
Job Distribution
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SL ING JOB DISTR IBUT ION
Topology
Instance Sling ID: 1
Job Manager
Instance Sling ID: 2
Job Manager
Instance Sling ID: 3
Job Manager
Instance Sling ID: 4
Job Manager
Job Consumer Topic: A
Job Consumer Topic: B
Job Consumer Topic: C
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SL ING JOB DISTR IBUT ION
Instance Sling ID: 1
Job Manager
Instance Sling ID: 2
Job Manager
Instance Sling ID: 3
Job Manager
Instance Sling ID: 4
Job Manager A
Job Consumer Topic: A
Job Consumer Topic: B
A:2
Job Consumer Topic: C Job
Topology
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SL ING JOB DISTR IBUT ION
Instance Sling ID: 1
Job Manager
Instance Sling ID: 2
Job Manager
Instance Sling ID: 3
Job Manager
Instance Sling ID: 4
Job Manager B
Job Consumer Topic: A
Job Consumer Topic: B
B:3
Job Consumer Topic: C Job
Topology
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SL ING JOB DISTR IBUT ION
Instance Sling ID: 1
Job Manager
Instance Sling ID: 2
Job Manager
Instance Sling ID: 3
Job Manager
Instance Sling ID: 4
Job Manager C
Job Consumer Topic: A
Job Consumer Topic: B
C:4
Job Consumer Topic: C Job
?
Topology
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SL ING JOB DISTR IBUT ION
Instance Sling ID: 1
Job Manager
Instance Sling ID: 2
Job Manager
Instance Sling ID: 3
Job Manager
Instance Sling ID: 4
Job Manager C
Job Consumer Topic: A
Job Consumer Topic: B
C:4
Job Consumer Topic: C Job
Offloading Framework
Topology
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• Detects offloading jobs • Transport of job and job
payload between origin and target instance
• Uses replication for the transport
• No distribution of jobs • No execution of jobs
OFFLOADING FRAMEWORK Overview
Instance Sling ID: 1
Job Manager
Offloading Job Manager
C:4
Instance Sling ID: 4
Job Manager
Job Consumer Topic: C
Offloading Job Manager
C:4
C
Job
Replication
1
2
3 5
4
6 7
Topology
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• Replication agents are created automatically • Uses naming convention • Needs manual adjustments (replication user)
OFFLOADING FRAMEWORK Replication
Worker Sling ID: 4
Author Sling ID: 1
offloading_4 (outgoing agent)
offloading_reverse_4 (reverse agent)
offloading_outbox (outbox agent)
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• Additional properties required • Offloading job input
• Property: OffloadingJobProperties. INPUT_PAYLOAD (offloading.input.payload) • Offloading job output
• Property: OffloadingJobProperties. OUTPUT_PAYLOAD (offloading.output.payload)
• Takes comma separated list of paths • Used to build the replication package • Job sender needs to set these properties for offloading to work!
OFFLOADING FRAMEWORK Job Payload
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• Configures Job Consumers • Configures the topic white/black listing properties of each instance • What jobs to execute on what instance
• Configures the distribution • Configuration applies for both, clustered and non-clustered installations
OFFLOADING BROWSER UI
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OFFLOADING BROWSER UI
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OFFLOADING BROWSER UI
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OFFLOADING BROWSER UI
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OVERVIEW Where to fit in the stack
Discovery
Offloading Workflow Distribution
DAM Ingestion
Sling
Granite
AEM
Job Distribution
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• New JobConsumer • Class: WorkflowOffloadingJobConsumer • Topic: com/adobe/granite/workflow/offloading • Can launch new workflows • Expects the workflow model on the job payload • Expects the workflow payload on the job payload
• For use with clustered and non-clustered installations
WORKFLOW DISTR IBUT ION
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@Component @Service @Property(name = JobConsumer.PROPERTY_TOPICS, value = WorkflowOffloadingJobConsumer.TOPIC) public class WorkflowOffloadingJobConsumer implements JobConsumer { public static final String TOPIC = "com/adobe/granite/workflow/offloading"; public static final String WORKFLOW_OFFLOADING_MODEL = "offloading.workflow.model"; public static final String WORKFLOW_OFFLOADING_PAYLOAD = "offloading.workflow.payload”; public JobResult process(Job job) { // read workflow model and payload from job payload String modelPath= job.getProperty(WORKFLOW_OFFLOADING_MODEL , ""); String payloadPath= job.getProperty(WORKFLOW_OFFLOADING_PAYLOAD , ""); // get/create WorkflowSession, WorkflowModel and WorkflowData objects WorkflowSession wfSession = ..; WorkflowModel wfModel = ..; WorkflowData wfData = ..; // start the workflow wfSession.startWorkflow(wfModel, wfData, metaData); // all good return JobResutl.OK; } }
WORKFLOW DISTR IBUT ION Job Consumer (Simplified)
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@Component @Service @Property(name = JobConsumer.PROPERTY_TOPICS, value = WorkflowOffloadingJobConsumer.TOPIC) public class WorkflowOffloadingJobConsumer implements JobConsumer { public static final String TOPIC = "com/adobe/granite/workflow/offloading"; public static final String WORKFLOW_OFFLOADING_MODEL = "offloading.workflow.model"; public static final String WORKFLOW_OFFLOADING_PAYLOAD = "offloading.workflow.payload”; public JobResult process(Job job) { // read workflow model and payload from job payload String modelPath= job.getProperty(WORKFLOW_OFFLOADING_MODEL , ""); String payloadPath= job.getProperty(WORKFLOW_OFFLOADING_PAYLOAD , ""); // get/create WorkflowSession, WorkflowModel and WorkflowData objects WorkflowSession wfSession = ..; WorkflowModel wfModel = ..; WorkflowData wfData = ..; // start the workflow wfSession.startWorkflow(wfModel, wfData, metaData); // all good return JobResutl.OK; } }
WORKFLOW DISTR IBUT ION Job Consumer (Simplified)
• Define the job topic
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@Component @Service @Property(name = JobConsumer.PROPERTY_TOPICS, value = WorkflowOffloadingJobConsumer.TOPIC) public class WorkflowOffloadingJobConsumer implements JobConsumer { public static final String TOPIC = "com/adobe/granite/workflow/offloading"; public static final String WORKFLOW_OFFLOADING_MODEL = "offloading.workflow.model"; public static final String WORKFLOW_OFFLOADING_PAYLOAD = "offloading.workflow.payload”; public JobResult process(Job job) { // read workflow model and payload from job payload String modelPath= job.getProperty(WORKFLOW_OFFLOADING_MODEL , ""); String payloadPath= job.getProperty(WORKFLOW_OFFLOADING_PAYLOAD , ""); // get/create WorkflowSession, WorkflowModel and WorkflowData objects WorkflowSession wfSession = ..; WorkflowModel wfModel = ..; WorkflowData wfData = ..; // start the workflow wfSession.startWorkflow(wfModel, wfData, metaData); // all good return JobResutl.OK; } }
WORKFLOW DISTR IBUT ION Job Consumer (Simplified)
• Create service component • Must register with topic • Implement new JobConsumer
interface
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@Component @Service @Property(name = JobConsumer.PROPERTY_TOPICS, value = WorkflowOffloadingJobConsumer.TOPIC) public class WorkflowOffloadingJobConsumer implements JobConsumer { public static final String TOPIC = "com/adobe/granite/workflow/offloading"; public static final String WORKFLOW_OFFLOADING_MODEL = "offloading.workflow.model"; public static final String WORKFLOW_OFFLOADING_PAYLOAD = "offloading.workflow.payload”; public JobResult process(Job job) { // read workflow model and payload from job payload String modelPath= job.getProperty(WORKFLOW_OFFLOADING_MODEL , ""); String payloadPath= job.getProperty(WORKFLOW_OFFLOADING_PAYLOAD , ""); // get/create WorkflowSession, WorkflowModel and WorkflowData objects WorkflowSession wfSession = ..; WorkflowModel wfModel = ..; WorkflowData wfData = ..; // start the workflow wfSession.startWorkflow(wfModel, wfData, metaData); // all good return JobResutl.OK; } }
WORKFLOW DISTR IBUT ION Job Consumer (Simplified)
• Access job properties (payload) • Read workflow model and
payload from job properties
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@Component @Service @Property(name = JobConsumer.PROPERTY_TOPICS, value = WorkflowOffloadingJobConsumer.TOPIC) public class WorkflowOffloadingJobConsumer implements JobConsumer { public static final String TOPIC = "com/adobe/granite/workflow/offloading"; public static final String WORKFLOW_OFFLOADING_MODEL = "offloading.workflow.model"; public static final String WORKFLOW_OFFLOADING_PAYLOAD = "offloading.workflow.payload”; public JobResult process(Job job) { // read workflow model and payload from job payload String modelPath= job.getProperty(WORKFLOW_OFFLOADING_MODEL , ""); String payloadPath= job.getProperty(WORKFLOW_OFFLOADING_PAYLOAD , ""); // get/create WorkflowSession, WorkflowModel and WorkflowData objects WorkflowSession wfSession = ..; WorkflowModel wfModel = ..; WorkflowData wfData = ..; // start the workflow wfSession.startWorkflow(wfModel, wfData, metaData); // all good return JobResutl.OK; } }
WORKFLOW DISTR IBUT ION Job Consumer (Simplified)
• Workflow specific • Use workflow API to start
workflow for the given model and payload
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@Component @Service @Property(name = JobConsumer.PROPERTY_TOPICS, value = WorkflowOffloadingJobConsumer.TOPIC) public class WorkflowOffloadingJobConsumer implements JobConsumer { public static final String TOPIC = "com/adobe/granite/workflow/offloading"; public static final String WORKFLOW_OFFLOADING_MODEL = "offloading.workflow.model"; public static final String WORKFLOW_OFFLOADING_PAYLOAD = "offloading.workflow.payload”; public JobResult process(Job job) { // read workflow model and payload from job payload String modelPath= job.getProperty(WORKFLOW_OFFLOADING_MODEL , ""); String payloadPath= job.getProperty(WORKFLOW_OFFLOADING_PAYLOAD , ""); // get/create WorkflowSession, WorkflowModel and WorkflowData objects WorkflowSession wfSession = ..; WorkflowModel wfModel = ..; WorkflowData wfData = ..; // start the workflow wfSession.startWorkflow(wfModel, wfData, metaData); // all good return JobResutl.OK; } }
WORKFLOW DISTR IBUT ION Job Consumer (Simplified)
• Use JobResult enumeration to report back the job status
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OVERVIEW Where to fit in the stack
Discovery
Offloading Workflow Distribution
DAM Ingestion
Sling
Granite
AEM
Job Distribution
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• Default ingestion workflow: “DAM Update Asset” • Load is put on the instance where the workflow is started, usually the author
• New ingestion workflow: “DAM Update Asset Offloading” • Needs to be manually enabled by changing the workflow launcher • New workflow model with a single step: AssetOffloadingProcess • Uses WorkflowExternalProcess API • Creates a new job on topic: com/adobe/granite/workflow/offloading • Allows distributing the default ingestion workflow • Load is put on the instance where the job is distributed to
• Can be used to distribute in clustered and non-clustered installations
DAM INGEST ION
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@Component @Service public class AssetOffloadingProcess implements WorkflowExternalProcess { @Reference private JobManager jobManager; private static final String TOPIC = "com/adobe/granite/workflow/offloading"; public Serializable execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap metaDataMap){ Asset asset = ..; String workflowModel = “/etc/workflow/models/dam/update_asset/jcr:content/model”; String workflowPayload = “/content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg”; ValueMap jobProperties = new ValueMapDecorator(new HashMap<String, Object>()); jobProperties.put(WORKFLOW_OFFLOADING_MODEL, workflowModel); jobProperties.put(WORKFLOW_OFFLOADING_PAYLOAD, workflowPayload); String offloadingInput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; String offloadingOutput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; jobProperties.put(OffloadingJobProperties.INPUT_PAYLOAD.propertyName(), offloadingInput); jobProperties.put(OffloadingJobProperties.OUTPUT_PAYLOAD.propertyName(), offloadingOutput); Job offloadingJob = jobManager.addJob(TOPIC, null, jobProperties); return offloadingJob.getId(); }
DAM INGEST ION Create Job (from workflow step)
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@Component @Service public class AssetOffloadingProcess implements WorkflowExternalProcess { @Reference private JobManager jobManager; private static final String TOPIC = "com/adobe/granite/workflow/offloading"; public Serializable execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap metaDataMap){ Asset asset = ..; String workflowModel = “/etc/workflow/models/dam/update_asset/jcr:content/model”; String workflowPayload = “/content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg”; ValueMap jobProperties = new ValueMapDecorator(new HashMap<String, Object>()); jobProperties.put(WORKFLOW_OFFLOADING_MODEL, workflowModel); jobProperties.put(WORKFLOW_OFFLOADING_PAYLOAD, workflowPayload); String offloadingInput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; String offloadingOutput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; jobProperties.put(OffloadingJobProperties.INPUT_PAYLOAD.propertyName(), offloadingInput); jobProperties.put(OffloadingJobProperties.OUTPUT_PAYLOAD.propertyName(), offloadingOutput); Job offloadingJob = jobManager.addJob(TOPIC, null, jobProperties); return offloadingJob.getId(); }
DAM INGEST ION Create Job (from workflow step)
• Create service component • Implement
WorkflowExternalProcess interface
• Reference JobManager service
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@Component @Service public class AssetOffloadingProcess implements WorkflowExternalProcess { @Reference private JobManager jobManager; private static final String TOPIC = "com/adobe/granite/workflow/offloading"; public Serializable execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap metaDataMap){ Asset asset = ..; String workflowModel = “/etc/workflow/models/dam/update_asset/jcr:content/model”; String workflowPayload = “/content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg”; ValueMap jobProperties = new ValueMapDecorator(new HashMap<String, Object>()); jobProperties.put(WORKFLOW_OFFLOADING_MODEL, workflowModel); jobProperties.put(WORKFLOW_OFFLOADING_PAYLOAD, workflowPayload); String offloadingInput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; String offloadingOutput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; jobProperties.put(OffloadingJobProperties.INPUT_PAYLOAD.propertyName(), offloadingInput); jobProperties.put(OffloadingJobProperties.OUTPUT_PAYLOAD.propertyName(), offloadingOutput); Job offloadingJob = jobManager.addJob(TOPIC, null, jobProperties); return offloadingJob.getId(); }
DAM INGEST ION Create Job (from workflow step)
• DAM and Workflow specific • Resolve to Asset • Read model from meta data • Read workflow payload from
Asset path
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public Serializable execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap metaDataMap){ Asset asset = ..; String workflowModel = “/etc/workflow/models/dam/update_asset/jcr:content/model”; String workflowPayload = “/content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg”; ValueMap jobProperties = new ValueMapDecorator(new HashMap<String, Object>()); jobProperties.put(WORKFLOW_OFFLOADING_MODEL, workflowModel); jobProperties.put(WORKFLOW_OFFLOADING_PAYLOAD, workflowPayload); String offloadingInput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; String offloadingOutput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; jobProperties.put(OffloadingJobProperties.INPUT_PAYLOAD.propertyName(), offloadingInput); jobProperties.put(OffloadingJobProperties.OUTPUT_PAYLOAD.propertyName(), offloadingOutput); Job offloadingJob = jobManager.addJob(TOPIC, null, jobProperties); return offloadingJob.getId(); }
DAM INGEST ION Create Job (from workflow step)
• ValueMap for job properties • Put model and payload on job
properties • Used by the JobConsumer
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public Serializable execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap metaDataMap){ Asset asset = ..; String workflowModel = “/etc/workflow/models/dam/update_asset/jcr:content/model”; String workflowPayload = “/content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg”; ValueMap jobProperties = new ValueMapDecorator(new HashMap<String, Object>()); jobProperties.put(WORKFLOW_OFFLOADING_MODEL, workflowModel); jobProperties.put(WORKFLOW_OFFLOADING_PAYLOAD, workflowPayload); String offloadingInput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; String offloadingOutput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; jobProperties.put(OffloadingJobProperties.INPUT_PAYLOAD.propertyName(), offloadingInput); jobProperties.put(OffloadingJobProperties.OUTPUT_PAYLOAD.propertyName(), offloadingOutput); Job offloadingJob = jobManager.addJob(TOPIC, null, jobProperties); return offloadingJob.getId(); }
DAM INGEST ION Create Job (from workflow step)
• Build offloading payload properties • Comma separated list of paths • Put them on the job payload as
well • Only used for non-clustered
distribution
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public Serializable execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap metaDataMap){ Asset asset = ..; String workflowModel = “/etc/workflow/models/dam/update_asset/jcr:content/model”; String workflowPayload = “/content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg”; ValueMap jobProperties = new ValueMapDecorator(new HashMap<String, Object>()); jobProperties.put(WORKFLOW_OFFLOADING_MODEL, workflowModel); jobProperties.put(WORKFLOW_OFFLOADING_PAYLOAD, workflowPayload); String offloadingInput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; String offloadingOutput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; jobProperties.put(OffloadingJobProperties.INPUT_PAYLOAD.propertyName(), offloadingInput); jobProperties.put(OffloadingJobProperties.OUTPUT_PAYLOAD.propertyName(), offloadingOutput); Job offloadingJob = jobManager.addJob(TOPIC, null, jobProperties); return offloadingJob.getId(); }
DAM INGEST ION Create Job (from workflow step)
• Create job using JobManager service
• Use topic from job consumer • Put job payload properties • Return the jobId as the workflow
process id (workflow specific)
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@Component @Service public class AssetOffloadingProcess implements WorkflowExternalProcess { @Reference private JobManager jobManager; private static final String TOPIC = "com/adobe/granite/workflow/offloading"; public Serializable execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap metaDataMap){ …. } public boolean hasFinished(Serializable externalProcessId, ..){ // returns null, if job is finished Job offloadingJob = jobManager.getJobById((String) externalProcessId); return offloadingJob == null; } }
DAM INGEST ION Create Job (from workflow step)
• Workflow API specific callback • Process id = jobId, from
execute() • Query job by jobId • Workflow step finished when job
is finished
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• Choose a job topic • Create JobConsumer component and register with topic chosen • To create a new job use new JobManager.addJob() API with the topic chosen
and the job payload • Add offloading payload to job payload • Bundle and deploy JobConsumer on topology instances • Enable/Disable the new topic on the instances, using Offloading Browser
DEVELOPMENT - RECIPE
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TAKE AWAY
Discovery
Offloading Workflow Distribution
DAM Ingestion
Sling
Granite
AEM
Job Distribution
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TAKE AWAY
Discovery
Offloading Workflow Distribution
DAM Ingestion
Sling
Granite
AEM
Job Distribution
org.apache.sling.discovery.api • Discovers topology • Cross-Cluster detection • Foundation for job distribution
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TAKE AWAY
Discovery
Offloading Workflow Distribution
DAM Ingestion
Sling
Granite
AEM
Job Distribution
org.apache.sling.event • Uses Sling Discovery • New JobConsumer API and job topics • New JobManager API for creating new distributed jobs • Distributes jobs based on available job topics and job queue
configuration. • Distributes in the whole topology, including clustered and non-
clustered instances • Can execute cluster local jobs only
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TAKE AWAY
Discovery
Offloading Workflow Distribution
DAM Ingestion
Sling
Granite
AEM
Job Distribution
com.adobe.granite.offloading.core
• Builds on top of Sling Distributed Jobs • Does not perform distribution • Detects jobs distributed to non-clustered instances • Transports the jobs and payload to non-clustered
instances • Uses replication for transport • Does not execute jobs
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Discovery
Offloading Workflow Distribution
DAM Ingestion
Sling
Granite
AEM
Job Distribution
com.adobe.granite.workflow.core
• Defines a job consumer to distribute the execution of whole workflows
• Defines topic com/adobe/granite/workflow/offloading
• Implements WorkflowOffloadingJobConsumer component
• Supports clustered and non clustered installations
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Discovery
Offloading Workflow Distribution
DAM Ingestion
Sling
Granite
AEM
Job Distribution
cq-dam-core
• Makes use of com/adobe/granite/workflow/offloading topic from Workflow Distribution
• New workflow step (external step) that creates a new job on topic com/adobe/granite/workflow/offloading
• New “DAM Update Asset Offloading” workflow • Supports clustered and non clustered
configurations
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TAKE AWAY Potential Future
Discovery
Offloading Workflow Distribution
DAM Ingestion
Sling
Granite
AEM
Job Distribution
Felix OSGi Event Admin
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TAKE AWAY Potential Future
Discovery
Offloading Workflow Distribution
DAM Ingestion
Sling
Granite
AEM
Job Distribution
Felix OSGi Event Admin
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New OSGi Specification • Distributed Eventing • Cloud Computing
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TAKE AWAY Potential Future
Discovery
Offloading Workflow Distribution
DAM Ingestion
Sling
Granite
AEM
Job Distribution
Felix OSGi Event Admin
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Job Distribution • Improved load balancing • Pull based distribution
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TAKE AWAY Potential Future
Discovery
Offloading Workflow Distribution
DAM Ingestion
Sling
Granite
AEM
Job Distribution
Felix OSGi Event Admin
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Offloading • As part of job distribution • Even simpler setup
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Discovery
Offloading Workflow Distribution
DAM Ingestion
Sling
Granite
AEM
Job Distribution
Felix OSGi Event Admin
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