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Hazelcast vs VoltDB: What are the differences?
What is Hazelcast? Clustering and highly scalable data distribution platform for Java. With its various distributed data structures, distributed caching capabilities, elastic nature, memcache support, integration with Spring and Hibernate and more importantly with so many happy users, Hazelcast is feature-rich, enterprise-ready and developer-friendly in-memory data grid solution.
What is VoltDB? In-memory relational DBMS capable of supporting millions of database operations per second. VoltDB is a fundamental redesign of the RDBMS that provides unparalleled performance and scalability on bare-metal, virtualized and cloud infrastructures. VoltDB is a modern in-memory architecture that supports both SQL + Java with data durability and fault tolerance.
Hazelcast and VoltDB belong to "In-Memory Databases" category of the tech stack.
Some of the features offered by Hazelcast are:
- Distributed implementations of java.util.{Queue, Set, List, Map}
- Distributed implementation of java.util.concurrent.locks.Lock
- Distributed implementation of java.util.concurrent.ExecutorService
On the other hand, VoltDB provides the following key features:
- In-Memory Performance with On-Disk Durability
- Transparent Scalability with Data Consistency
- NewSQL – All the benefits of SQL with Unlimited Scalability
"High Availibility" is the primary reason why developers consider Hazelcast over the competitors, whereas "SQL + Java" was stated as the key factor in picking VoltDB.
Hazelcast is an open source tool with 3.18K GitHub stars and 1.16K GitHub forks. Here's a link to Hazelcast's open source repository on GitHub.
Pros of Hazelcast
- High Availibility11
- Distributed Locking6
- Distributed compute6
- Sharding5
- Load balancing4
- Map-reduce functionality3
- Simple-to-use3
- Written in java. runs on jvm3
- Publish-subscribe3
- Sql query support in cluster wide3
- Optimis locking for map2
- Performance2
- Multiple client language support2
- Rest interface2
- Admin Interface (Management Center)1
- Better Documentation1
- Easy to use1
- Super Fast1
Pros of VoltDB
- SQL + Java5
- In-memory database4
- A brainchild of Michael Stonebraker4
- Very Fast3
- NewSQL2
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Cons of Hazelcast
- License needed for SSL4