Using Kafka to Optimize Data Movement and System Integration. Alex
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1 Using Kafka to Optimize Data Movement and System Integration Alex
2
3 THIS SUCKS E T (circa 2560 B.C.E.) L
4 a few years later...
5 2,014 C.E. i need you to copy data from oracle to HADOOP... 3 weeks later... this sucks!
6 Agenda Look at challenges with data and system integration Provide an overview of Kafka, including its performance Examine Kafka data and system integration patterns
7 whoami Alex Holmes Software engineer Working on distributed systems for many grepalex.com
8 Challenges with data integration
9 i need you to copy data from oracle into Hadoop for our data scientists
10 Sqoop Custom ETL Hadoop Problems you ll need to solve: Reliability/fault tolerance Scalability/throughput Handle large tables Throttle network IO Idempotent writes Scheduling
11 OH, AND WE NEED To use the same data to calculate aggregates in real-time
12 Sqoop Hadoop? NoSQL
13 Hadoop OLTP OLAP / EDW HBase Cassan dra Voldem ort Rec. Engine Analytics Security Search Monitoring Social Graph
14 Hadoop OLTP OLAP / EDW HBase Cassan dra Voldem ort kafka Rec. Engine Analytics Security Search Monitoring Social Graph
15 Kafka
16 Background Apache project Originated from LinkedIn Open-sourced in 2011 Written in Scala and Java Borrows concepts in messaging systems and logs
17 Powered by Twitter LinkedIn Netflix Spotify Mozilla
18 A log (partition in Kafka parlance) First record Most recent record
19 Producer-consumer system Producer Producer Producer Kafka Consumer Consumer Consumer
20 Kafka!= JMS Doesn t use the JMS API Ordering guarantees Mid-to-long term message storage Rewind capabilities Many-to-many messaging Broker doesn t maintain delivery state
21 Concepts A Kafka cluster consists of 1..N brokers and manages 1..N topics Topics are a category or feed name where messages are published Topics have one or more partitions, which are ordered, immutable sequence of messages that are continually appended to, much like a commit log
22 Data scaling and parallelism Partition Partition Partition
23 Partition distribution Round-robin/ load balance Producer Domain-specific semantic partition strategy Server Server Server Partition 0 Partition 1 Partition 2 Partition 3 Partition 4 Partition 5
24 Consumers Server Server Server Partition 0 Partition 1 Partition 2 Consumer A Consumer B Consumer A Consumer group 1 Queue-balancing load Pub-sub - all messages broadcasted to all consumers
25 Consumer state High-level consumer Low-level consumer (manage your own state) ZooKeeper Pick your own offset storage adventure Consumer Partition 0 Consumer Partition 0 Oldest Oldest Newest Newest
26 Partition replication Producers Server Server Server "Leader" partition "Follower" partition "Follower" partition Consumers
27 Performance + Scalability
28 Scalability Producer Producer Producer Kafka Server Kafka Server Kafka Server Consumer Consumer Consumer
29 Sequential disk IO Consumer A Consumer B Producer reads reads writes Disk
30 O.S. page cache is leveraged Consumer A Consumer B Producer reads reads writes OS page cache Disk
31 Zero-copy IO Traditional Zero-copy
32 Throughput Producer Producer Producer 2,024,032 TPS 2ms Kafka Server Kafka Server Kafka Server 2,615,968 TPS Consumer Consumer Consumer
33 Kafka data integration patterns
34 External data subscription Subscriber Subscriber Your App Kafka Subscriber Subscriber
35 Internal data subscription Hadoop Analytics Your App Kafka Recomm endations Monitoring Security
36 Stream processing Your App Kafka Your App NoSQL Your App
37 Lambda architecture Kafka NoSQL Hadoop
38 Multi-datacenter Datacenter 1 Datacenter 2 Kafka Kafka Datacenter 3 Kafka
39 Additional patterns Partition on user ID so all events for a user land on a single partition Publish system and application logs for downstream aggregation and monitoring System of record for your data
40 Data standardization Important to pick a lingua franca for your data Considerations should include compactness, schema evolution, tooling and third-party support Avro is a good fit (coupled with Parquet for on-disk)
41 Conclusion Kafka is a scalable system with useful traits such as ordered messages, durability, availability Popular for data movement and feeding multiple downstream systems using the same data pipe Excellent documentation available at
42 Shameless plug Book signing at the JavaOne 1pm tomorrow CON The Top 10 Hadoop Patterns and 11am tomorrow Parc 55 - Embarcadero
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