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SOA, Low latency, highly scalable, High volume
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Build highly scalable_low_latency_applications
1.
Building Highly Scalable
and High Scalable Applications using Java/JEE Technologies Shivnarayan Varma Sr. Architect Tech COE, Fiserv
2.
© 2010 Fiserv,
Inc. or its affiliates. Agenda : • Defining and understanding scalability. • Scalability variables & Factors • Building our own Scalable Application • (Scale seamlessly • High Performance • Unlimited storage expansion • Reduce Network Latency • Direct the user to nearest server • Scale out, no Scale in • Sweet spot: Low Cost, High Performance, Scalable ) • Scalability Real Time Issue
3.
© 2012 Fiserv,
Inc. or its affiliates.•3 • How do I know if I have a scalability problem? • Why we need scalability? Defining and understanding scalability.
4.
© 2012 Fiserv,
Inc. or its affiliates. Scalability Variables • Scalability - Number of users / sessions / transactions / operations the entire system can perform • Performance – Optimal utilization of resources • Responsiveness – Time taken per operation • Availability - Probability of the application or a portion of the application being available at any given point in time • Downtime Impact - The impact of a downtime of a server/service/resource - number of users, type of impact etc • Cost • Maintenance Effort 4
5.
© 2012 Fiserv,
Inc. or its affiliates. Factors for Building Robust Scalable JEE Application • Platform selection • Hardware • Network limits • Garbage Collection • Application Design/ Architecture • Database Structure and Architecture • Deployment Architecture • Storage Architecture • Monitoring mechanisms 5
6.
6 Typical JEE Reference
Architecture
7.
7 Building our own
Scalable Application. Platform selection Hardware Application Design Database/Data store Structure and Architecture Deployment Architecture Storage Architecture Monitoring Mechanism
8.
© 2012 Fiserv,
Inc. or its affiliates. Identify areas of bottlenecks • Database red/Write • Memory Clustering • Failover Caching 8
9.
© 2012 Fiserv,
Inc. or its affiliates.•9 Typical JEE Reference Architecture
10.
© 2012 Fiserv,
Inc. or its affiliates.
11.
© 2012 Fiserv,
Inc. or its affiliates. JEE Scalability Points • We will now build an example architecture for an example app using the following iterative incremental steps – • Inspect current Architecture • Identify Scalability Bottlenecks • Identify SPOFs and Availability Issues • Identify Downtime Impact Risk Zones • Apply one of - • Vertical Scaling • Vertical Partitioning • Horizontal Scaling • Horizontal Partitioning • Repeat process 11
12.
© 2012 Fiserv,
Inc. or its affiliates. JEE Scalability Points • We will now build an example architecture for an example app using the following iterative incremental steps – • Inspect current Architecture • Identify Scalability Bottlenecks • Identify SPOFs and Availability Issues • Identify Downtime Impact Risk Zones • Apply one of - • Vertical Scaling • Vertical Partitioning • Horizontal Scaling • Horizontal Partitioning • Repeat process 12
13.
© 2012 Fiserv,
Inc. or its affiliates. Clustering factors • High Availability • Load balancing • Fault Tolerance • Failover • Idempotent methods 13
14.
© 2012 Fiserv,
Inc. or its affiliates. Best Practices • Use scalable session replication mechanisms Use collocated deployment instead of distributed one Shared resources and services Distributed cache • Memcached/Terracotta • Paralleled processing • MapReduce • MPI • Using unorthodox approach to achieve high scalability • • 14
15.
© 2012 Fiserv,
Inc. or its affiliates. How can I integrate multiple applications so that they work together and can exchange information? Remote Procedure Invocation File Transfer Shared Database Messaging- MOM
16.
© 2012 Fiserv,
Inc. or its affiliates. Asynchronous MOM Element Channels are separate from applications Channels are asynchronous & reliable
17.
© 2012 Fiserv,
Inc. or its affiliates. How does one application communicate with another using messaging? Messaging Channel -A virtual pipe that connects a sender to a receiver application.
18.
© 2012 Fiserv,
Inc. or its affiliates. Point To Point Channel How can the sender be sure that exactly one receiver will receive the message? In point-to-point Java Message Service (JMS) , messages are routed to an individual consumer which maintains a queue of "incoming" messages. This messaging type is built on the concept of message queues, senders, and receivers
19.
© 2012 Fiserv,
Inc. or its affiliates. Publish – Subscribe Channel How can the sender broadcast a message to all interested receivers? In JMS publish – subscribe ,subscribers may register interest in receiving messages on a particular message topic. In this model, neither the publisher nor the subscriber knows about each other.
20.
20 Message Routing
21.
© 2012 Fiserv,
Inc. or its affiliates. Web Banking Page 21 • Partitioning •HTTP Caching •RDBMS Sharding •NOSQL • Distributed Caching •Data Grids •Concurrency Scalability Patterns: State
22.
© 2012 Fiserv,
Inc. or its affiliates. Advance Confirmation Page 22 • HTTP Caching • Reverse Proxy • • Varnish • • Squid • • rack-cache • • Pound • • Nginx • • Apache mod_proxy • • Traffic Server
23.
© 2012 Fiserv,
Inc. or its affiliates. Successful Creation of RA 23 • Generate Static Content • Precompute content • • Homegrown + cron or Quartz • • Spring Batch • • Gearman • • Hadoop • • Google Data Protocol • • Amazon Elastic MapReduce
24.
© 2012 Fiserv,
Inc. or its affiliates.24
25.
© 2012 Fiserv,
Inc. or its affiliates.25 HTTP Caching Subsequent request
26.
© 2012 Fiserv,
Inc. or its affiliates. How to scale out RDBMS? 26 • Sharding • •Partitioning • •Replication
27.
© 2012 Fiserv,
Inc. or its affiliates. Sharding: Partitioning 27
28.
© 2012 Fiserv,
Inc. or its affiliates. NOSQL in the wild 28 •Google: Bigtable • Amazon: Dynamo • Amazon: SimpleDB • Yahoo: HBase • Facebook: Cassandra • LinkedIn: Voldemort NOSQL in the wild
29.
© 2012 Fiserv,
Inc. or its affiliates. Sharding: Partitioning 29 • Relational DBs (MySQL, Oracle, Postgres) • Object DBs (Gemstone, db4o) • Clustering products (Coherence, Terracotta) • Most caching products (ehcache)
30.
© 2012 Fiserv,
Inc. or its affiliates. Sharding: Partitioning 30 • Types of NOSQL stores • • Key-Value databases (Voldemort, Dynomite) • • Column databases (Cassandra, Vertica, Sybase IQ) • • Document databases (MongoDB, CouchDB) • • Graph databases (Neo4J, AllegroGraph) • • Datastructure databases (Redis, Hazelcast)
31.
© 2012 Fiserv,
Inc. or its affiliates. Distributed Caching 31 • •Write-through • •Write-behind • • Eviction Policies • • Replication • • Peer-To-Peer (P2P) • Distributed Caching
32.
© 2012 Fiserv,
Inc. or its affiliates. Distributed Caching 32 • Pain of Duplication • • How do I get failover capability while avoiding • excessive duplication of data?
33.
© 2012 Fiserv,
Inc. or its affiliates. Distributed Caching 33
34.
© 2012 Fiserv,
Inc. or its affiliates. References 34 • http://www.theserverside.com/news/1320914/Scaling-Your-Java-EE- Applications-Part-2
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