This manual is for an old version of Hazelcast Jet, use the latest stable version.


  • Hazelcast Jet or Jet both refer to the same distributed data processing engine provided by Hazelcast, Inc.
  • Hazelcast or Hazelcast IMDG both refer to Hazelcast in-memory data grid middleware. Hazelcast is also the name of the company (Hazelcast, Inc.) providing Hazelcast IMDG and Hazelcast Jet.


Hazelcast Jet and Hazelcast Jet Reference Manual are free and provided under the Apache License, Version 2.0.


Hazelcast is a registered trademark of Hazelcast, Inc. All other trademarks in this manual are held by their respective owners.

Phone Home

Hazelcast uses phone home data to learn about usage of Hazelcast Jet.

Hazelcast Jet instances call our phone home server initially when they are started and then every 24 hours. This applies to all the instances joined to the cluster.

What is sent in?

The following information is sent in a phone home:

  • Hazelcast Jet version
  • Local Hazelcast Jet member UUID
  • Download ID
  • A hash value of the cluster ID
  • Cluster size bands for 5, 10, 20, 40, 60, 100, 150, 300, 600 and > 600
  • Number of connected clients bands of 5, 10, 20, 40, 60, 100, 150, 300, 600 and > 600
  • Cluster uptime
  • Member uptime
  • Environment Information:
    • Name of operating system
    • Kernel architecture (32-bit or 64-bit)
    • Version of operating system
    • Version of installed Java
    • Name of Java Virtual Machine
  • Hazelcast IMDG Enterprise specific:
    • Number of clients by language (Java, C++, C#)
    • Flag for Hazelcast Enterprise
    • Hash value of license key
    • Native memory usage

Phone Home Code

The phone home code itself is open source. Please see here.

Disabling Phone Homes

Set the system property to false either in the config or on the Java command line.

Starting with Hazelcast Jet 0.5, you can also disable the phone home using the environment variable HZ_PHONE_HOME_ENABLED. Simply add the following line to your .bash_profile:


Phone Home URLs

For versions 1.x and 2.x:

For versions 3.x up to 3.6:

For versions after 3.6:

Getting Help

Support for Hazelcast Jet is provided via GitHub, Hazelcast Jet mailing list and Stack Overflow.

For information on the commercial support for Hazelcast Jet, please see

Typographical Conventions

The below table shows the conventions used in this manual.

Convention Description
bold font - Indicates part of a sentence that requires the reader's specific attention.
- Also indicates property/parameter values.
italic font - When italicized words are enclosed with "<" and ">", it indicates a variable in the command or code syntax that you must replace (for example, hazelcast-<version>.jar).
- Note and Related Information texts are in italics.
monospace Indicates files, folders, class and library names, code snippets, and inline code words in a sentence.
RELATED INFORMATION Indicates a resource that is relevant to the topic, usually with a link or cross-reference.
image NOTE Indicates information that is of special interest or importance, for example an additional action required only in certain circumstances.
element & attribute Mostly used in the context of declarative configuration that you perform using an XML file. Element refers to an XML tag used to configure a feature. Attribute is a parameter owned by an element, contributing into the declaration of that element's configuration. Please see the following example.

<property name="property1">value1</property>

In this example, name is an attribute of the property element.