7e5abd504f
Add three DBOS SDK skills with reference documentation for building reliable, fault-tolerant applications with durable workflows. Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
43 lines
1.3 KiB
Markdown
43 lines
1.3 KiB
Markdown
---
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title: Partition Queues for Per-Entity Limits
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impact: HIGH
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impactDescription: Enables per-entity concurrency control
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tags: queue, partition, per-user, dynamic
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---
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## Partition Queues for Per-Entity Limits
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Partitioned queues apply flow control limits per partition key instead of the entire queue. Each partition acts as a dynamic "subqueue".
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**Incorrect (global concurrency for per-user limits):**
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```go
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// Global concurrency=1 blocks ALL users, not per-user
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queue := dbos.NewWorkflowQueue(ctx, "tasks",
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dbos.WithGlobalConcurrency(1),
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)
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```
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**Correct (partitioned queue):**
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```go
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queue := dbos.NewWorkflowQueue(ctx, "tasks",
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dbos.WithPartitionQueue(),
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dbos.WithGlobalConcurrency(1),
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)
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func onUserTask(ctx dbos.DBOSContext, userID, task string) error {
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// Each user gets their own partition - at most 1 task per user
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// but tasks from different users can run concurrently
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_, err := dbos.RunWorkflow(ctx, processTask, task,
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dbos.WithQueue(queue.Name),
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dbos.WithQueuePartitionKey(userID),
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)
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return err
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}
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```
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When a queue has `WithPartitionQueue()` enabled, you **must** provide a `WithQueuePartitionKey()` when enqueuing. Partition keys and deduplication IDs cannot be used together.
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Reference: [Partitioning Queues](https://docs.dbos.dev/golang/tutorials/queue-tutorial#partitioning-queues)
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