Does Temporal Workflow Streams replace a durable session layer?
Blog post from Ably
Temporal's Workflow Streams, currently in public preview for Python and TypeScript, is a built-in streaming abstraction designed to provide exactly-once, ordered delivery of a single Workflow's output to subscribers, bypassing the need for a separate relay like a Redis pub/sub system. This system, however, only supports one-way communication through long-polling, meaning it cannot replace a durable session layer which is necessary for capabilities such as real-time push delivery, bidirectional communication, multi-participant visibility, offline delivery, conversation branching, and human handover. While Workflow Streams excels at delivering durable, ordered messages from a Workflow, a durable session layer is required for more complex interaction scenarios where feedback from clients or multiple participant visibility is needed. Users already utilizing a Redis pub/sub relay should evaluate whether Workflow Streams matches their needs, as migrating might not be beneficial if their current setup accommodates bidirectional input, multiple agents, or human operator involvement.
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