New WAN Replication (synchronization of separate active clusters)

New Data Affinity (co-location of related entries) feature.

New EC2 Auto Discovery for your Hazelcast cluster running on Amazon EC2 platform.

New Distributed CountDownLatch implementation.

New Distributed Semaphore implementation.

Improvement: Distribution contains HTML and PDF documentation besides Javadoc.

Improvement: Better TCP/IP and multicast join support. Handling more edge cases like multiple nodes starting at the same time.

Improvement: Memcache protocol: Better integration between Java and Memcache clients. Put from memcache, get from Java client.

Monitoring Tool is removed from the project.

200+ commits 25+ bug fixes and several other enhancements.

Re-implementation of distributed queue.

Re-implementation of distributed list supporting index based operations.

New distributed semaphore implementation.

Optimized IMap.putAll for much faster bulk writes.

New IMap.getAll for bulk reads which is calling MapLoader.loadAll if necessary.

New IMap.tryLockAndGet and IMap.putAndUnlock API

New IMap.putTransient API for storing only in-memory.

New IMap.addLocalEntryListener() for listening locally owned entry events.

New IMap.flush() for flushing the dirty entries into MapStore.

New MapLoader.getAllKeys API for auto-pre-populating the map when cluster starts.

Support for min. initial cluster size to enable equally partitioned start.

Graceful shutdown.

Faster dead-member detection.

Memcache interface support. Memcache clients written in any language can access Hazelcast cluster.

RESTful access support. http://<ip>:5701/hazelcast/rest/maps/mymap/key1

Split-brain (network partitioning) handling

New LifecycleService API to restart, pause Hazelcast instances and listen for the lifecycle events.

New asynchronous put and get support for IMap via IMap.asyncPut() and IMap.asyncGet()

New AtomicNumber API; distributed implementation of java.util.concurrent.atomic.AtomicLong

So many bug fixes.

Significant performance gain for multi-core servers. Higher CPU utilization and lower latency.

Reduced the cost of map entries by 50%.

Better thread management. No more idle threads.

Queue Statistics API and the queue statistics panel on the Monitoring Tool.

Monitoring Tool enhancements. More responsive and robust.

Distribution contains hazelcast-all-<version>.jar to simplify jar dependency.

So many bug fixes.

Bug fixes

Sorted index optimization for map queries.

A major bug fix

Minor optimizations

Hazelcast Cluster Monitoring Tool (see the hazelcast-monitor-1.8.1.war in the distro)

New Partition API. Partition and key owner, migration listeners.

New IMap.lockMap() API.

New Multicast+TCP/IP join feature. Try multicast first, if not found, try tcp/ip.

New Hazelcast.getExecutorService(name) API. Have separate named ExecutorServices. Do not let your big tasks blocking your small ones.

New Logging API. Build your own logging. or simply use Log4j or get logs as LogEvents.

New MapStatistics API. Get statistics for your Map operations and entries.

HazelcastClient automatically updates the member list. no need to pass all members.

Ability to start the cluster members evenly partitioned. so no migration.

So many bug fixes and enhancements.

There are some minor Config API change. Just make sure to re-compile.

Java clients for accessing the cluster remotely. (C# is next)

Distributed Query for maps. Both Criteria API and SQL support.

Near cache for distributed maps.

TTL (time-to-live) for each individual map entry.

IMap.put(key,value, ttl, timeunit)

IMap.putIfAbsent(key,value, ttl, timeunit)

Many bug fixes.

Multiple Hazelcast members on the same JVM. New HazelcastInstance API.

Better API based configuration support.

Many performance optimizations. Fastest Hazelcast ever!

Smoother data migration enables better response times during joins.

Many bug fixes.

Persistence via Loader/Store interface for distributed map.

Socket level encryption. Both symmetric and asymmetric encryption supported.

New JMX support. (many thanks to Marco)

New Hibernate second level cache provider (many thanks to Leo)

Instance events for getting notified when a data structure instance (map, queue, topic etc.) is created or destroyed.

Eviction listener. EntryListener.entryEvicted(EntryEvent)

Fully 'maven'ized.

Modularized...

hazelcast (core library)

hazelcast-wm (http session clustering tool)

hazelcast-ra (JCA adaptor)

hazelcast-hibernate (hibernate cache provider)

Support for synchronous backups and configurable backup-count for maps.

Eviction support. Timed eviction for queues. LRU, LFU and time based eviction for maps.

Statistics/history for entries. create/update time, number of hits, cost. see IMap.getMapEntry(key)

MultiMap implementation. similar to google-collections and apache-common-collections MultiMap but distributed and thread-safe.

Being able to destroy() the data structures when not needed anymore.

Being able to Hazelcast.shutdown() the local member.

Get the list of all data structure instances viaHazelcast.getInstances().

Major internal refactoring

Full implementation ofjava.util.concurrent.BlockingQueue. Now queues can have configurable capacity limits.

Super Clients: Members with no storage. If -Dhazelcast.super.client=true JVM parameter is set, that JVM will join the cluster as a 'super client' which will not be a 'data partition' (no data on that node) but will have super fast access to the cluster just like any regular member does.

Http Session sharing support for Hazelcast Web Manager. Different webapps can share the same sessions.

Ability to separate clusters by creating groups. ConfigGroup

java.util.logging support.

Add, remove and update events for queue, map, set and list

Distributed Topic for pub/sub messaging

Integration with J2EE transactions via JCA complaint resource adapter

ExecutionCallback interface for distributed tasks

Cluster-wide unique id generator

Transactional Distributed Queue, Map, Set and List

Distributed Executor Service

Multi member executions

Key based execution routing

Task cancellation support

Session Clustering with Hazelcast Webapp Manager

Full TCP/IP clustering support

Distributed implementation of java.util.{Queue,Map,Set,List}

Distributed implementation of java.util.concurrency.Lock

Cluster Membership Events