Event Store 5.0.0 Release Candidate 2

Event Store 5.0.0 RC 2 is out! It is available for the following operating systems:

  • Windows
  • Ubuntu 18.04
  • Ubuntu 16.04
  • Ubuntu 14.04
  • macOS 10.9+
  • CentOS 7 (Commercial version)
  • Amazon Linux AMI (Commercial version)

This release candidate contains all the changes in 5.0.0 RC 1 plus the following changes.

Event Store 5.0.0 RC 2 Changelog

New Features

  • #1678 - (Server) Structured Logging
    By adding StructuredLog: True to your config or launching EventStore with --structured-log, your logs and stats files will magically turn into JSON which can easily be ingested into your log aggregation platform for analysis. Each line written to the logs/stats file is a serialized JSON string.
  • [Commercial] Correlation/Causation ID visualization
    This feature allows you to visualize event flows if you use the correlation/causation ID pattern. The $by_correlation_id projection must be turned on for this feature to work. To access this feature, you can go to the “Visualize” tab in the web UI menu.
  • #1813 - (Server) Referenced Environment Variables (thanks to @hanxinimm!)
    EventStore has for a long time supported setting configuration parameters through Environment Variables. For example, setting the environment variable EVENTSTORE_EXT_IP= when launching the node is equivalent to adding ExtIP: to your config file.
    With this change, you can now reference another environment variable by setting the value to ${env:REFERENCED_ENV_VAR}. For instance, if you’re on Azure Service Fabric some predefined environment variables exist. You could thus set EVENTSTORE_EXT_IP=${env:Fabric_NodeIPOrFQDN} to easily reference the node’s IP address.
  • [Packaging] A .pkg installer is now available for macOS in the downloads section of our website.
  • [Packaging] The EventStore test client is now bundled in deb and rpm packages as estestclient
  • [Commercial/Windows] Allow the EventStore Manager service to be installed or uninstalled in non-interactive mode. This is useful for unattended installation of EventStore through a powershell script.

Bug Fixes / Enhancements

  • #1737 - (Server) Fixed ObjectPoolMaxLimitReachedException for many reader threads (thanks to @MadKat13!)
    When --reader-threads-count is increased, the object pool size was not scaled up accordingly. The following error would be thrown during high read load: Object pool 'ReadIndex readers pool' has reached its max limit for items: 14.
  • #1774 - (Projections) Add a FaultOutOfOrderProjections option (default: True) to allow the user to specify if a projection should be faulted when there is a discontinuity in event ordering. For example, if a stream has a $maxAge or $maxCount, a projection processing this stream may not receive some events if they have already “expired”. In case FaultOutOfOrderProjections is set to False, an error will simply be logged and the projection will continue processing events.
  • #1769 - (Client API) Fix issue where FailOnNoServerResponse() combined with KeepReconnecting() would cause the client to hang indefinitely
  • #1801 - (Test Client) Use testclient.conf for the EventStore test client instead of eventstore.conf
  • #211 - (UI) Fix bug in ProjectionService.js -> updateQuery() causing the source to be set to emit value when an empty string is passed as source
  • #1799 - (Server) Fix assembly information for EventStore.Native and EventStore.Rags
  • [Packaging] Bundle missing mono shared libraries in native packages: libmono-btls-shared, libmono-system-native
  • [Packaging/Performance] Add --optimize=inline mono runtime optimization to native packages


  • #210 - (UI) Remove bower components from repository
  • #1823 - (UI) Install bower for UI builds
  • #1800 - (Server) Add default file locations for macOS (for system-wide installations)
  • #1796 - (API Docs) Polish ExpectedVersion docs

Where can I get the packages?

Downloads are available on our website in the “Pre-Release” section.

The packages can be installed using the following instructions.

Ubuntu 14.04/16.04/18.04 (via packagecloud)

curl -s https://packagecloud.io/install/repositories/EventStore/EventStore-OSS-PreRelease/script.deb.sh | sudo bash
sudo apt-get install eventstore-oss=5.0.0-rc2-1

Windows (via Chocolatey)

choco install eventstore-oss -version 5.0.0-rc2 -pre

Client Packages

EventStore Client

Install-Package EventStore.Client -Pre

EventStore Embedded Client

Install-Package EventStore.Client.Embedded -Pre

How do I provide feedback?

We appreciate any feedback via either GitHub Issues or Google Groups.

Photo of Shaan Nobee

Written by: Shaan Nobee

Shaan joined Event Store in 2017 as a software engineer and works on the core database engine. He is from Mauritius, a beautiful and peaceful island in the Indian Ocean.

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