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Dapr

DEVOPS
Velocity5.0

Portable event-driven runtime for building distributed applications

dapr.io ↗

Dapr is fixing a cluster of workflow PENDING state bugs across three maintained release branches.

distributed-systemsworkflow-engineactorskubernetesreliability
◆Current state
Dapr is in active maintenance mode across three simultaneous release lines (1.16.x, 1.17.x, 1.18.x), with the recent entries focused almost entirely on bug fixes: workflow instances getting stuck permanently PENDING under various race conditions (scheduler restart, placement rebalance, slow reminder registration), pluggable pub/sub delivering messages serially instead of concurrently, and actor Placement reconnect failures after deactivation. The 1.18.4 release cycle required four release candidates before GA, indicating the workflow fixes were non-trivial to validate.
◆Where it's heading
The high concentration of workflow reliability fixes across multiple releases signals that Dapr's Workflow building block, while architecturally sound, is hitting edge cases in production scheduler and placement scenarios that weren't exercised at GA. The multi-branch backport pattern (the same fixes appearing in 1.16, 1.17, and 1.18) suggests Dapr is committed to keeping older release lines stable for enterprise deployments that can't upgrade immediately. The actor and pub/sub fixes are in the same reliability category.
◆Prediction
Expect the 1.18.5 RC cycle to begin once the current 1.18.4 release is validated in production. The workflow scheduler reliability work is likely ongoing — the PENDING state bugs fixed in 1.18.4 represent a pattern, not isolated incidents, and more edge cases in the Scheduler-Placement interaction will likely surface.

◆Recent moves

  1. 5d ago

    Dapr v1.17.14: pluggable pub/sub serial delivery fix

    v1.17.14 fixes pluggable pub/sub components that were delivering messages to the application one at a time instead of concurrently. The backport to 1.17 indicates this is a regression with production impact for teams using custom pub/sub implementations on the older stable line.

    View source ↗
  2. 5d ago

    Dapr Runtime v1.16.20

    v1.16.20 backports three fixes to the oldest maintained line: the Placement reconnect failure after actor deactivation, an actor call hang during slow Placement dissemination rounds, and the pluggable pub/sub serial delivery bug. This is stability maintenance for deployments locked to the 1.16.x branch.

    View source ↗
  3. 6d ago

    Dapr Runtime v1.18.4

    v1.18.4 GA resolves multiple workflow PENDING state scenarios: start reminders failing during scheduler restarts, reminders firing before creation commits, and placement rebalances interrupting reminder registration. Parent workflow deadlocks on child instance ID collision are also fixed. These are correctness issues that could permanently strand workflow instances in production.

    View source ↗
  4. 7d ago

    Dapr Runtime v1.18.4-rc.4

    v1.18.4-rc.4 includes access policy hot-reload ordering fixes and child/activity failure stamping improvements. RC work ahead of the v1.18.4 GA, with no user-visible changes beyond what's already described in the GA notes.

    View source ↗
  5. 13d ago

    Dapr Runtime v1.18.4-rc.3

    v1.18.4-rc.3 addresses stalled workflow watch and pins the workflow work item execution ID contract in integration tests. Infrastructure-level validation work before GA.

    View source ↗
  6. 19d ago

    Dapr v1.18.4-rc.2: workflow recreate-collision pin

    RC-level fix pinning the workflow recreate-collision behavior — an integration test precision fix ahead of v1.18.4 GA. No user-visible change.

    View source ↗