What is Hazelcast?

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.
Hazelcast is a tool in the In-Memory Databases category of a tech stack.
Hazelcast is an open source tool with 3.2K GitHub stars and 1.2K GitHub forks. Here’s a link to Hazelcast's open source repository on GitHub

Who uses Hazelcast?

35 companies reportedly use Hazelcast in their tech stacks, including Yammer, Internet Factory Seat Pagine Gialle, and Stormpath.

78 developers on StackShare have stated that they use Hazelcast.

Hazelcast Integrations

Why developers like Hazelcast?

Here’s a list of reasons why companies and developers use Hazelcast
Hazelcast Reviews

Here are some stack decisions, common use cases and reviews by companies and developers who chose Hazelcast in their tech stack.


If you have big, multi-module and distributed projects, you will need solutions to establish communication among services, distributed cache, etc. At the same time, you will need to run many cluster-based processes individually. For example, in the case of using coupons at the same time, you need a cluster-based lock to limit users to a single transaction only.

It’s possible to overcome with a solution that has many features such as in-memory distributed cache, lock, broadcast, and distributed task execution. And, there is a solution, developed in our own country: Hazelcast

Please read our blog post for more details.

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Ian Eslick
Ian Eslick
CEO at Massachusetts Institute of Technology · | 1 upvotes · 757 views
atVital Labs, Inc.Vital Labs, Inc.

HazelCast is the foundation for the distributed system that hosts our APIs and intelligent workflows. We wrap the core HazelCast functions in Clojure protocols to implement micro-services on top of a coherent, single-process instance per virtual node. Hazelcast

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Hazelcast's Features

  • Distributed implementations of java.util.{Queue, Set, List, Map}
  • Distributed implementation of java.util.concurrent.locks.Lock
  • Distributed implementation of java.util.concurrent.ExecutorService
  • Distributed MultiMap for one-to-many relationships
  • Distributed Topic for publish/subscribe messaging
  • Synchronous (write-through) and asynchronous (write-behind) persistence
  • Transaction support
  • Socket level encryption support for secure clusters
  • Second level cache provider for Hibernate
  • Monitoring and management of the cluster via JMX
  • Dynamic HTTP session clustering
  • Support for cluster info and membership events
  • Dynamic discovery, scaling, partitioning with backups and fail-over

Hazelcast Alternatives & Comparisons

What are some alternatives to Hazelcast?
Redis is an open source, BSD licensed, advanced key-value store. It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets and sorted sets.
Apache Spark
Spark is a fast and general processing engine compatible with Hadoop data. It can run in Hadoop clusters through YARN or Spark's standalone mode, and it can process data in HDFS, HBase, Cassandra, Hive, and any Hadoop InputFormat. It is designed to perform both batch processing (similar to MapReduce) and new workloads like streaming, interactive queries, and machine learning.
Memcached is an in-memory key-value store for small chunks of arbitrary data (strings, objects) from results of database calls, API calls, or page rendering.
Partitioning means that Cassandra can distribute your data across multiple machines in an application-transparent matter. Cassandra will automatically repartition as machines are added and removed from the cluster. Row store means that like relational databases, Cassandra organizes data by rows and columns. The Cassandra Query Language (CQL) is a close relative of SQL.
Aerospike is an open-source, modern database built from the ground up to push the limits of flash storage, processors and networks. It was designed to operate with predictable low latency at high throughput with uncompromising reliability – both high availability and ACID guarantees.
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Hazelcast's Stats

Hazelcast's Followers
86 developers follow Hazelcast to keep up with related blogs and decisions.
Muhammed Ozbilici
aybars badur
Ashok Ram
Oscar  Hernan
Vlad Voinov
Conor Lane
John DesJardins
Selim Öztürk