Hazelcast Releases In-Memory Data Grid 3.8

Hazelcast, a provider of an open source in-memory data grid (IMDG) has announced the general availability of Hazelcast IMDG 3.8, providing an improved operational experience for systems requiring maximum uptime. 

According to Hazelcast, with this release, the number of times the cluster must be shut down for maintenance has been dramatically reduced. Advanced data management capabilities have also been added for managing persistence and multi-data center deployments.

Available in 3.8, “rolling member upgrades” enable users to upgrade cluster members without service interruption. This adds to the client rolling upgrade feature introduced in 3.6 a year ago. Combined with user code deployment, the company says, this strongly reduces the need to restart a production Hazelcast cluster.

With the "hot restart store," Hazelcast has also added the ability to restart a cluster after a lights-out event with partial failures such as servers that cannot be restarted. Backed up data can also be copied to new machines and used to restart a new cluster with data intact. The ability to take a snapshot of the hot restart store in a running cluster for periodic backups that can be saved offline. 

In addition, WAN replication is enhanced with new dynamic WAN synchronization which permits users to copy one cluster’s data to another without service interruption. The sync process can be started inside the WAN Sync interface of Management Center, meaning that, at any time, users can create a new WAN replication destination and a snapshot of their current cluster using sync ability, allowing a new data center to be brought online without service interruption.

And finally, “user code deployment” allows the user code that needs to be deployed to Hazelcast to allow in-situ processing.

For more information on the new release, visit