4.0

Hazelcast Jet 4.0

• Updated Hazelcast IMDG version to 4.0, which brings many new features
  such as a revamped metrics system, improved performance.
• Jet now supports calling user-defined Python function from within a
  pipeline using the mapUsingPython transform.
• Snapshots now offer support for distributed two-phase commit (2PC),
  which enables end-to-end exactly-once processing support for sinks and
  sources such as JMS and files.
• Clients can now collect the results of jobs they have submitted via
  Rx-style Observables.
• Users can now add custom metrics to their Pipelines.
• The distribution has been improved with support for daemon mode and
  rolling file based logging.
• Snapshot statistics (keys & bytes saved) and job lifecycle-statistics
  (no. of jobs submitted, terminated and so on) can be tracked via
  metrics now.
• Debezium-Jet connector is now available in hazelcast-jet-contrib. The
  connector makes it possible to stream changes from a database into Jet,
  also known as Change Data Capture (CDC).
• A Kafka Connect adapter is added which enables using any Kafka Connect
  source inside Jet.
• It is now possible to specify the main class when submitting jobs from
  CLI.