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Workers with single decision poller with sticky tasklist feature enabled will stop processing #1369

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shijiesheng opened this issue Oct 8, 2024 · 2 comments
Open

Workers with single decision poller with sticky tasklist feature enabled will stop processing #1369

shijiesheng opened this issue Oct 8, 2024 · 2 comments

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@shijiesheng
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Describe the bug
Decision worker will stop processing if decision poller count is 1 and sticky tasklist is enabled

To Reproduce
MaxConcurrentDecisionTaskPollers is set to 1 (default 2)
Or MinConcurrentDecisionTaskPollers is set to 1 and Poller Auto Scaler is enabled

Expected behavior
Workflow workers should process decision tasks
@shijiesheng
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Root Cause
Current implementation is:
X number of decision goroutines are started
Each goroutine will either call sticky tasklist or normal tasklist based on metrics
When X = 1, the condition will always be true. This causes decision polling to stop for normal tasklist

Temporal keeps the same logic https://github.com/temporalio/sdk-go/blob/cdd30702f1ba479b57111763095e24a25a04ea53/internal/internal_task_pollers.go#L781

@shijiesheng
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We decided to add enforcement to have at least 2 decision pollers to avoid breaking existing behaviors

@shijiesheng shijiesheng mentioned this issue Oct 8, 2024
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@shijiesheng shijiesheng reopened this Oct 8, 2024
shijiesheng added a commit that referenced this issue Oct 10, 2024
@shijiesheng
added worker.NewV2 with validation on decision poller count (#1370)
89676d3 
What changed?

added a worker.NewV2 interface that will return error and a deprecation message on New api.
added validation on WorkerOptions
-- decision poller should be larger than 1 if value is set (not zero) and sticky execution is enabled.
Why?
#1369

How did you test it?
Unit Test

Potential risks
Low
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@shijiesheng