Deep Dive into Apache Apex App Development
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This document provides a detailed overview of Apache Apex, a stream processing framework, including its application development model that revolves around directed acyclic graphs (DAGs) made of operators and streams. It outlines the lifecycle of operators, the types of application examples, and various data source integrations for building applications. Additional resources for documentation, community support, and example projects are also provided.
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- 1. Deep Dive Into Apache Apex Application Chaitanya Chebolu
- 2. Application Development Model 2 âŞA Stream is a sequence of data tuples âŞA typical Operator takes one or more input streams, performs computations & emits one or more output streams ⢠Each Operator is YOUR custom business logic in java, or built-in operator from our open source library ⢠Operator has many instances that run in parallel and each instance is single-threaded âŞDirected Acyclic Graph (DAG) is made up of operators and streams Directed Acyclic Graph (DAG) Output Stream Tupl e Tupl e er Operator er Operator er Operator er Operator er Operator er Operator
- 4. 4 DAG Types O1 O2 O3 O4 O5⢠Logical Plan â Logical representation of computation â Defines operators, streams and dataflow ⢠Physical Plan â Deployable plan on cluster â Contains partition information of operators â Has ready-to-deploy serialized operator instances Logical DAG O1 P1 O1 P2 O1 P3 O2 P1 O2 P2 O2 P3 U O3 O4 O5 Physical DAG
- 5. 5 â All operators in DAG go through this life-cycle â Managed by Apex Platform â Governed by control tuples Operator Lifecycle
- 6. 6 â Setup âStart of operator lifecycle âDo any initialization here â beginWindow âMarks starting of window â endWindow âMarks end of window â teardown âDo any finalization here âEnd of operator lifecycle Operator Lifecycle (contd...)
- 7. 7 Operator Lifecycle (contd...) â emitTuples âCalled for Input Adapters âCalled in an infinite while loop by platform â process âCalled for Generic Operators and Output Adapters âAssociated to to a port âCalled for every incoming tuple
- 8. 8 Operator Lifecycle (contd...) â OutputPort::emit âSpecial method not part of operator lifecycle âTo be called by operator code âEmits the tuples to next operator âBound by Window
- 9. 9 Input Operator (Adapter) Output Operator (Adapter) Generic Operators LOGSReader Parser Counter Output HDFS Defining DAG
- 10. 10 ⢠MyApplication implements StreamingApplication ᾠProvide implementation for populateDAG ᾠStitch the DAG APIs : Application
- 11. 11 ⢠SampleInputOperator implements InputOperator ᾠDefine output ports ᾠDefine emitTuples method. ᾠDefine beginWindow, endWindow, setup, teardown APIs : InputOperator
- 12. 12 ⢠SampleOperator extends BaseOperator ᾠDefine input ports, output ports ᾠDefine process methods ᾠOptional : Define beginWindow, endWindow, setup, teardown APIs : GenericOperator, OutputOperator
- 13. Application Specification (Java) 13 DAG API (compositional)
- 16. Operator Library 16 RDBMS ⢠Vertica ⢠MySQL ⢠Oracle ⢠JDBC NoSQL ⢠Cassandra, Hbase ⢠Aerospike, Accumulo ⢠Couchbase/ CouchDB ⢠Redis, MongoDB ⢠Geode Messaging ⢠Kafka ⢠Solace ⢠Flume, ActiveMQ ⢠Kinesis, NiFi File Systems ⢠HDFS/ Hive ⢠NFS ⢠S3 Parsers ⢠XML ⢠JSON ⢠CSV ⢠Avro ⢠Parquet Transformations ⢠Filters ⢠Rules ⢠Expression ⢠Dedup ⢠Enrich Analytics ⢠Dimensional Aggregations (with state management for historical data + query) Protocols ⢠HTTP ⢠FTP ⢠WebSocket ⢠MQTT ⢠SMTP Other ⢠Elastic Search ⢠Script (JavaScript, Python, R) ⢠Solr ⢠Twitter
- 17. 17 Java : 1.7.x mvn : 3.0 + git : 1.7 + Apache hadoop : How to : Single node cluster Apache Apex Core áľ git clone [email protected]:apache/apex-core.git áľ cd apex-core/ áľ git checkout master áľ mvn clean install -DskipTests Apache Apex Malhar áľ git clone [email protected]:apache/apex-malhar.git áľ cd apex-malhar/ áľ git checkout master áľ mvn clean install -DskipTests DataTorrent RTS community edition Building Apache Apex
- 20. Q&A 20
- 21. Resources 21 ⢠http://apex.apache.org/ ⢠Learn more: http://apex.apache.org/docs.html ⢠Subscribe - http://apex.apache.org/community.html ⢠Download - http://apex.apache.org/downloads.html ⢠Follow @ApacheApex - https://twitter.com/apacheapex ⢠Meetups â http://www.meetup.com/pro/apacheapex/ ⢠More examples: https://github.com/DataTorrent/examples ⢠Slideshare: http://www.slideshare.net/ApacheApex/presentations ⢠https://www.youtube.com/results?search_query=apache+apex ⢠Free Enterprise License for Startups - https://www.datatorrent.com/product/startup-accelerator/