EventStoreDB 4.0.2 Release Candidate 1

The first release candidate for Event Store 4.0.2 is now available! It is available for the following operating systems:

• Windows (via Chocolatey)
• Ubuntu 16.04 (via packagecloud)
• Ubuntu 14.04 (via packagecloud)

Our focus has remained on projections following them becoming a supported feature in Event Store. This release includes numerous fixes and performance improvements for projections.

Event Store Server 4.0.2 RC 1 release notes

Event Store Server

• #1265 - (All Platforms) - Add functionality to parse Dictionaries via Rags
• #1277 - (All Platforms) - Correctly convert the subscription confirmations
• #1280 - (All Platforms) - Revert to legacy queued handler.
• #1282 - (Mono) - Reduce CPU usage of idling Event Store on mono
• #1287 - (All Platforms) - Improve GetHashCode
• #1336 - (All Platforms) - Remove unnecessary logging filling up client’s log files
• #1369 - (All Platforms) - Limit pending send bytes and drop messages to closed connections
• #1298 - (All Platforms) - Remove PAdmin in favor of the ES CLI

Event Store Server - Projections

• #1272, #1312 - (All Platforms) - Disallow the deletion of System Projections
• #1273 - (All Platforms) - Support any valid json as partition state
• #1279 - (All Platforms) - Handle all messages in queue even if a consumer throws an error
• #1281 - (All Platforms) - Partition should handle empty string as simple state
• #1299 - (All Platforms) - Safe guard collection causing “Collection was modified when running projections” errors
• #1303 - (All Platforms) - Fix cases where projections are just buffering
• #1305 - (All Platforms) - Projection Processing Phase can be null
• #1307 - (All Platforms) - Add additional logging for failure conditions
• #1309 - (All Platforms) - Improve multi stream reader feedback loop
• #1314 - (Windows) - Fix projection compilation timeout on Windows
• #1325 - (All Platforms) - Change how registered projections are read to prevent deleted projections coming back to life
• #1326 - (All Platforms) - Add ‘fromCategories’ helper
• #1338 - (All Platforms) - Checkpoint after a certain period
• #1346 - (All Platforms) - Time out reads in the ProjectionManagerResponseReader
• #1351 - (All Platforms) - Dont allow the checkpoint to be enabled for a one time projection as
• #1357, #1356, #1360 - (All Platforms) - Make use of the idempotency checks when attempting rewrites
• #1359 - (All Platforms) - Replace strings with constants
• #1368 - (All Platforms) - Handle read timeouts during projection recovery
• #1370 - (All Platforms) - Fix projections getting stuck in preparing when a node becomes master
• #1373 - (All Platforms) - Limit the number of inflight writes per projection to 1
• #1374 - (All Platforms) - Expose config options for projections

Event Store Server - Persistent Subscriptions

• #1302 - (All Platforms) - Fix checkpoint bug where events could be skipped

Event Store UI

• (https://github.com/EventStore/EventStore.UI/pull/154) - Allow read/update of projection config

Embedded client

• #1266 - (All Platforms) - Fix acking for embedded persistent subscriptions

.NET Client

• #1285 - (All Platforms) - Allow use name of catch-up subscription in connection verbose logging
• #1262 - (All Platforms) - Add client API for executing queries and awaiting results
• #1310, #1323 - (All Platforms) - Support async OnEventAppeared for subscriptions
• #1365 - (All Platforms) - Fix memory leak in ReadEventsInternalAsync for subscriptions

Where can I get the release candidate 1 packages?

The alpha packages can be installed using the following instructions.

Ubuntu 14.04/16.04 (via packagecloud)

curl -s https://packagecloud.io/install/repositories/EventStore/EventStore-OSS-PreRelease/script.deb.sh | sudo bash
sudo apt-get install eventstore-oss=4.0.2-rc1

Windows (via Chocolatey)

choco install eventstore-oss -version 4.0.2-rc1 -pre

Client Packages (via Nuget)

Install-Package EventStore.Client -Pre

How do I provide feedback?

We appreciate any feedback via either GitHub Issues or forum.