Vert.x gets blocked for ordered task execution when quarkus.thread-pool.queue-size is set

[ahus1]

Describe the bug

The configuration option quarkus.thread-pool.queue-size can be used to make the Quarkus executor thread pool reject threads. I use it for load tests of Keycloak for load shedding in an overload situation.

Due to eclipse-vertx/vert.x#4900 this can lead to the Vert.x TasksQueue to be permanently blocked, when an ordered task is submitted and it is rejected.

This issue is for tracking the current behavior which is included in Vert.x 4.4.x in the current versions of Quarkus. It will be part of the upcoming Vert.x 4.5.0 version (eclipse-vertx/vert.x#4904), and I've asked for backport to 4.4.x (eclipse-vertx/vert.x#4912).

Expected behavior

When setting quarkus.thread-pool.queue-size, the task execution shouldn't stall.

Actual behavior

The task execution is stalled until the Quarkus application is restarted as a variable is not cleared when the rejected exception is thrown.

How to Reproduce?

See eclipse-vertx/vert.x#4900. For Keycloak, this happend when I called MutinyHelper.blockingExecutor(vertx) - see keycloak/keycloak#23919

Quarkus version or git rev

3.2.6.Final

[cescoffier]

Unfortunately, the fix is only for Vert.x 4.5. I cannot tell when 4.5 will be integrated in Quarkus, unlikely this year.

[ahus1]

Thank you @cescoffier - that's good to know.

I've created a backport for Vert.x 4.4.x here eclipse-vertx/vert.x#4912 - let's see if it gets accepts and when there will be a another 4.4.x release.

[ahus1]

Update: The backport to 4.4.x has been accepted, but there is currently no planned release for a Vert.x 4.4.x release until more changes accumulate.

[cescoffier]

Closed - Vert.x has been updated.