HazelCast - University of Floridamschneid/Teaching/CIS4930+CIS6930_Fall...Introduction Hazelcast is...
Transcript of HazelCast - University of Floridamschneid/Teaching/CIS4930+CIS6930_Fall...Introduction Hazelcast is...
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Hazelcast
Abhinav Prashant
Shweta Amla
Yagna Namburi
Venkata Rama Krishn Pandi
Ryan Wolf
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Contents
1• Introduction
2• Architecture/Data Model
3• Features
4.• Query Mechanisms
5• Market Comparison
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Introduction
Hazelcast is a leading
Open Source In-Memory Data Grid
Written in JAVA
Startup founded in 2008
by- Talip Ozturk, Fuad Malikov
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Data Grid
• Ability to access, modify and transfer humongous data
• Security concerns
• Data access using middleware applications
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CAP Theorem
• Also called Brewer’s theorem
• Distributed systems simultaneously cannot provide:
o Consistency
o Availability
o Partition tolerance
• Hazelcast chooses availability over consistency
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In-Memory Database
• Lies in main-memory for data storage
• Faster as compared to disk-optimized database
• Improved response time - critical applications
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Hazelcast - In-memory data Grid
• Data stored in RAM of Servers
• Redundancy - multiple copies of data exists on different servers
• Scalability - servers can be dynamically added or removed
• Peer to peer communication – No Master Slave
• Data persistence done using Relational or other NoSQL database
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Hazelcast Topology
Hazelcast can be deployed in Two ways:
• Embedded
• Client-Server
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Embedded Deployment
• Applications requiring o High performance
o Lots of task execution
• Members include o Application
o Hazelcast data and Services
• Low-latency data access
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Client-Server Deployment
• Centralized - accessed by applications through clients
• Server members -independently created and scaled
• Predictable and reliable Hazelcastperformance
• Scalability handled independently.
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Contents
1• Introduction
2• Architecture/Data Model
3• Features
4.• Query Mechanisms
5• Market Comparison
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Architecture
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Cluster Management
• Cluster auto detects new node
• Discovery mechanisms available:o Multicast
o TCP
o EC2 Cloud
• Oldest node is the cluster leader
• Oldest node listens to join requests
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Data Partitioning
Why?
Fast data operations across cluster
• Number of partitions fixed across cluster
• Partitions are equally divided across active nodes
• Partition table is used to keep track of partitions
• Leader node periodically send updated partition table to peer nodes
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Hazelcast Partition
2 Nodes 4 NodesSingle Node
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Data Model
• Data stored as Key-Value pairs
• To store key, hashing is used to find the partition:Keys are serialized
Byte array hashed using hashing algorithms
Hash result is mod by number of partitions
hash(key) mod partition count
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In Memory Format
• By default, data stored in serialized format
• Option to store data as objects in de-serialized format
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Indexing
• Applied to frequently queried fields
• Implemented using Maps of map
• Two types:Ordered
Unordered
• Costly for write intensive application
• Backup data not indexed
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Implementing Indexing
Two methods:
a. Using API
b. Using Hazelcast config file
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Eviction
• Unless explicitly deleted, entries remain in the memory
• Eviction prevents the JVM from running out of memory
• Hazelcast supports two eviction policies o LFU (least frequently used)
o LRU (least recently used)
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Eviction Contd.
• Eviction can be triggered based on:○ Heap used (percentage or absolute value)
○ Maximum entry count (in an entire member or partition)
• Eviction percentage parameter - fraction of entry set to be removed
• Eviction can also be triggered based on the following parameters:○ Time to live
○ Maximum idle time
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Contents
1• Introduction
2• Architecture/Data Model
3• Features
4.• Query Mechanism
5• Market Comparison
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Key Features
• Distributed Computing
• High Density Memory Store
• Database Caching/Persistence
• Distributed Messaging
• Web Session Clustering
• Distributed Caching
• Distributed Data Structures
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Distributed Computing
• In-memory computations over
distributed datasets
• Asynchronous task execution
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High Density Memory Store
• High Density Memory Store
• Jcache provider
• Hazelcast High Density caching
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Database Caching/Persistence
• Caching solution foro NoSQL databases
o RDBMS databases
• Performs hit/miss mechanism
• Improves performance
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Distributed Messaging
• Publish and subscribe are cluster wide
• Ordered messaging
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Web Session Clustering
• Maintains session for user
• Balances load across sessions at failover
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Distributed Support
• Hibernate Second Level Cacheo Stale data problem!!!! Hazelcast to the rescue
• Spring Supporto hazelcast-all.jar or hazelcast-spring.jar
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Distributed Caching
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Get in Distributed Cache Map
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Put in Distributed Map
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Put in Distributed Map
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Failover in Distributed Cache
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Failover in Distributed Cache
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Failover in Distributed Cache
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Failover in Distributed Cache
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Distributed Data Structures
• Map
• Queue
• Multimap
• Set
• List
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Contents
1• Introduction
2• Architecture/Data Model
3• Features
4• Query Mechanisms
5• Market Comparison
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Query Mechanisms
• Queries are distributed
• Predicate filters accordingly
• Merge all results
• Fast and Concurrent
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Criteria API
Predicate Class provides operators like:
Equal, notEqual, greaterThan, greaterEqual
Example
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Querying with SQL
• SqlPredicate takes regular Where clause
• And/Or: <expression> AND <expression>
• Equality: =,!=,<,<=,>,>=
• Between:<attribute> [NOT] Between <values1> AND <values2>
• Indexing
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Aggregators
• Supplier
• Average
• Sum
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• Minimum
• Maximum
• Count
Aggregator’s Contd.
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MapReduce
Summary of main steps:1. Read the source data.
2. Map the data to one or multiple key-value pairs.
3. Reduce all pairs with the same key.
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Contents
1• Introduction
2• Architecture/Data Model
3• Features
4.• Query Language
5• Market Comparison
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Hazelcast as NoSQL Database
Young, but popular• Speed
• Memory
• Caching
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Hazelcast as In-Memory Store
• Popular for:• Licensing
• Support
• Languages
• Competition:• Oracle Coherence,
• VmWare Gemfire
• Terracotta
• Persistence• Mapping
• No Single Point of Failure
• Avoids Garbage Collection delays
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Hazelcast vs Redis
• Architecture• Language
• Threading
• Scaling • Adding/Removing Nodes
• Failover• Node Relationship
• Clustering• Type
• Addresses
• Discovery
• Persistence
• Querying
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Hazelcast vs Oracle Coherence
• Per-core pricing model• Cost• Flexibility
• Aging Technology• Features• 10 year old Java
• De-prioritization of Coherence• 12c• Support and Attention
• Complex Deployment• Time and Consulting
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Hazelcast vs Couchbase
• Consistency• Backups and Replicas
• Serialization• Data types
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Hazelcast vs Apache Cassandra
• Why is Cassandra used?• Time
• Data
• License
• Querying
• Flexible
• But…
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Industry use of Hazelcast
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References
http://docs.hazelcast.org/docs/3.5/manual/html/
https://hazelcast.org/getting-started/
https://hazelcast.org/features/
https://hazelcast.com/use-cases/caching/
http://www.slideshare.net/tmatyashovsky/distributed-applications-using-hazelcast