Change Log¶

May 2023¶

Add Cluster Backup to the cluster quickstart sample
Introduce new content relating to the quickstart, including Replicated State Machines, Raft Consensus, Application Level Protocols and Performance.

April 2023¶

Adaptive have incorporated Aeron Cookbook into the Aeron.io family. This means that it will become an official part of the Aeron documentation, with a wider range of contributors.
Added a section on Gateway Design
Updated Aeron to 1.41.0, Agrona to 1.18.0 and Simple Binary Encoding to 1.28.1
Updated to Aeron 1.41.1, Agrona 1.18.1 and SBE 1.28.2
Updated to Aeron 1.41.2

March 2023¶

RFQ cluster sample has been rebuilt from scratch using Simple Binary Encoding and the Adaptive Aeron Cluster quickstart.
Removed docker aeroncookbook:jdk17 images from sample code; docker samples are now based off of Azul Zulu JDK 17 images. This solves issues with running the docker samples on non-x86 CPU architectures.
Added link to Adaptive's Aeron Cluster quickstart which shows a simple cluster (built using an SBE protocol) running on Kubernetes and Docker
Added a new cookbook item for Aeron Cluster: How to run Aeron Cluster on Kubernetes

February 2023¶

Restructured the cluster-core samples into dedicated Async, RSM and RFQ projects.
Removed infrastructure logic from the cluster RSM example to allow a cleaner, and far simpler to test RSM
Replaced Eider with SBE in Async and RSM examples.
Moved to Gradle 8 with Kotlin script for the Aeron Cookbook Example Code. Also removed Shadow Jar plugin.
Removed SimplestCase sample from Aeron Cluster as it is not realistic of how one would use Aeron Cluster.
Added an SBE sample showing encoding and decoding without a message header, see GitHub.
Tighter checkstyle rules, with associated tidy ups.

November 2022¶

Fixed bad example in Aeron Debugging and added more details on accepted units.
Clarified that offer cannot be called on the Cluster object during onStart in Cluster Timers
Added a new cookbook item for Aeron Cluster: How to create startup tasks

October 2022¶

Started work on updates to Agrona content on non-boxing methods added to a number of collection classes in Agrona 1.17.0
Examples adapted for Aeron 1.40.0, SBE 1.27.0, Agrona 1.17.1
Updates to Aeron Archive examples for changes around Archive.Context and AeronArchive.Context

August 2022¶

Updates to the cluster stream identifiers in Understanding Cluster Counters
Clarifications to the dynamic Aeron Agent configuration in Aeron Agent

July 2022¶

Bump Aeron to 1.39.0, Agrona to 1.16.0 and SBE to 1.26.0

May 2022¶

Clarification around using tryClaim in ConcurrentPublication in Publications & Subscriptions

April 2022¶

Bump Aeron to 1.38.1, Agrona to 1.15.1 and SBE to 1.25.3
Bump Aeron to 1.38.2 and update C Media Driver build pages. Note there is no Java release for 1.38.2, so Java specific pages are left on 1.38.1
Clarifications to client data loss during leader failure in Raft. See Consensus Algorithms

March 2022¶

Minor clarifications in Aeron Cluster election state descriptions

December 2021¶

Election states reviewed against changes in 1.37.0. No change noted.
Removed integrated site feedback - did not provide any actionable insights.

November 2021¶

Integrated page feedback added
Bump Aeron to 1.37.0, Agrona to 1.14.0 and SBE to 1.25.1
Updated notes for building the C Media Driver on macOS
Bump Aeron to 1.36.0, Agrona to 1.13.0 and SBE to 1.25.0

October 2021¶

Corrections to RAFT content.
Prepare for integrated site feedback.

September 2021¶

Update to Aeron 1.35.1

August 2021¶

Added Async Publication APIs to Publications & Subscriptions
Added Working with Recordings to the Aeron Archive section.
Added Unable to allocate Counter error to the Aeron common errors section.
Added a note about the join position in a Subscription sub-pos as seen in Aeron Stat
Update to Aeron 1.35.0, Agrona 1.12.0, SBE 1.24.0. Note that the Election State diagram has a pending minor change.

June 2021¶

Introduction to Multi-Destination-Cast, with a focus on Dynamic Multi-Destination-Cast Publications.
Snowflake Identity Generator (as found in Agrona 1.11.0)
Is there a simpler way for a utility to connect to a local Aeron Archive?
Aeron Cluster Gateway Patterns
Bump SBE to 1.23.0
Bump Agrona to 1.11.0
Bump Aeron to 1.34.0

May 2021¶

Multi-host Aeron Archive sample
Added Aeron Archive Replication Sample
Dynamic Aeron Agent (as found in Aeron 1.33.0+)
Added usage sample for the standard Aeron Agent
Building the C Media Driver on CentOS Linux 8
Minor updates on maximum position in Understanding Aeron Position
Added notes on JEP 403 and JDK 17 to Running Aeron on JDK 16 and JDK 17
Added draft content for Message Passing to Distributed Systems Basics
Note on needing the Archive.Context.archiveClientContext() when replicating archives from remote machines in Aeron Archive Overview
Bump Aeron to 1.33.1
Bump Agrona to 1.10.0
Bump SBE to 1.22.0
Moved table of content navigation into left side navigation
Improvements to dark mode & embedded videos

April 2021¶

Clarification to Aeron Debugging
Running Aeron on JDK 16
Clarification on UDP checksums in How to add an application checksum to messages
Updates to Election States for Aeron 1.33.0
Updates to Understanding Cluster Counters for Aeron 1.33.0
Updates to Aeron Tooling and RPC Server - Running the sample for Aeron 1.33.0
Draft Dynamic Aeron Agent (as found in Aeron 1.33.0)
Clarification on role of Agent Runner in Agents and Idle Strategies

March 2021¶

Added How to decode Aeron network data captures with Wireshark
Clarifications on the link of MTU length to position; see Understanding Aeron Position
First cut of Troubleshooting Aeron and Aeron Cluster
How to add an application checksum to messages
New section on network latency impacts in Performance Limits
Update sample code to Java 16

February 2021¶

Corrections to null handing in Simple Binary Encoding
Additional clarifications and details on the output of AeronStat
Improvements to the Aeron cluster send-to-cluster-log documentation under Cluster Timers
Discussion on Aeron Cluster Sharding
Additional Cluster Error cases
Added BroadcastTransmitter and BroadcastReceiver to Agrona Concurrent collections
Removed Eider as a compile time dependency to the sample code

January 2021¶

Initial version of Cluster Clients
Updates to AeronStat options in Aeron Tooling
First cut of Understanding Aeron Cluster Counters
Added tryClaim to OneToOneRingBuffer in Agrona Concurrent Collections
Added notes on the error Cannot assign requested address
Improvements to Publications & Subscriptions around buffer reuse in FragmentHandlers & a common misunderstanding around which addresses to use in publications & subscriptions
Initial content for Cluster Errors
Add Aeron Cluster election states Election States
Initial ArchiveTool details Aeron Archive Tooling
Added an alternative to Aeron Cluster Timers for cases when you want a message sent back to the cluster for processing as soon as possible, but not before any pending sequenced messages are processed. Efficient Business Logic adjusted to mention the approach as well.
Bump SBE to 1.21.0, Aeron to 1.32.0

December 2020¶

Building the C Media Driver on macOS
Building the C Media Driver on Ubuntu 20.04
Building the C Media Driver on Windows 10
New section on Cluster Client Consistency
Added ControlledMessageHandler to OneToOneRingBuffer in Agrona Concurrent Collections
Swapped out Eider for Simple Binary Encoding in the Aeron RPC sample
Changed the Aeron IPC sample to send ~10 million messages/second on a laptop
Added performance notes to Aeron IPC sample, plus changes needed to run with the Aeron C Media Driver
Added Two Agent example of OneToOneRingBuffer
Added ManyToOneRingBuffer in Agrona Concurrent Collections
Added Three Agent example of ManyToOneRingBuffer
Minor update to Publications & Subscriptions regarding read only nature of the buffer in FragmentHandlers, ExclusivePublication being required for initial position replay, and the various offer variants
Minor update to Aeron Cluster Timers around cluster snapshots and timers.
Added Log Inspector to Aeron Tooling
Added How to increase Aeron timeouts for debugging to the cookbook
Bump Agrona to 1.9.0 and SBE to 1.20.4
Added initial details on the C Media Driver to the Media Driver section
Added note on the C versions of AeronStat, ErrorStat, LossStat to Aeron Tooling

November 2020¶

Bump Aeron to 1.31.1
New section on Reference Data within Aeron Cluster
New section on Efficient Business Logic in Aeron Cluster
New section on Databases and Aeron Cluster
Clarifications on Aeron Cluster Timers
Updates to Cluster Performance Limits

October 2020¶

Bump Aeron to 1.31.0, Agrona to 1.8.0, SBE to 1.20.3
Switch to JDK 15
Site fixes for mobile devices, printing
Agrona Concurrent Collections
Added Long2x collections to Agrona Data Structures
Aeron Channels, Streams and Sessions
Clarification in Publications & Subscriptions about a Publication not being able to send until a Subscription is ready
Note on potential timer data structures in Threads, Agents & Duty Cycles

September 2020¶

Bump Aeron to 1.30.0
Bump Agrona to 1.7.2
Bump SBE to 1.20.2
Performance Limits of Aeron Cluster
Improved site search with better structured results, search term highlighting. Dark mode support - note that some issues remain with dark mode & SVGs.

August 2020¶

Start building out the task oriented cookbook content
New cookbook content for Aeron, Aeron Cluster and Agrona topics
Additional Aeron Common Error content for Active Driver, Message Size
Clarifications in Term Buffer Lengths in Log Buffers & Images
LossStat and BacklogStat added to Aeron Tooling
Further details on how to read AeronStat output, see Aeron Tooling
Fixed various broken internal links
Understanding Aeron's Position and how to see it via AeronStat and other tools, see Position
Bump Agrona to 1.7.0 and SBE to 1.20.0

July 2020¶

RFQ server Aeron Cluster sample and content added
Aeron Archive overview rewritten
Backpressure section improved
Replicated State Machine updates
Link added to Aeron Cookbook from Official Aeron Wiki
Agrona 1.6.0 updates
SBE 1.19.0 updates
Aeron 1.29.0 updates
Switched typography to fonts better suited to longer form text
Reduce color intensity of the site, reworking all images and animations
Contact page added
Link to Issues added
Threads, Agents & Duty Cycles added
Reduced page size by ±10%

June 2020¶

Switch all diagrams to SVG
Vector Clocks added Vector Clocks section
Async Systems added
Consensus Algorithms added
RPC server Aeron RPC sample and content added
Rewrite Media Driver content
Log Buffers & Images content added
Aeron Cluster Timers content extended
Aeron Cluster Basic Sample added snapshoting details

May 2020¶

Improved Aeron IPC sample
Total Ordering added
Vector Clocks added Lamport Clocks section and sample
Agrona Direct Buffers added section and samples for UnsafeBuffer
Aeron 1.28.x updates

(changelog not captured prior to May 2020)