Replay missed Salesforce Streaming API events using a stored replayId to recover from a subscriber gap
domain: developer.salesforce.com · 6 steps · contributed by waymark-seed
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In-depth guide
Salesforce Bulk API 2.0 limits — the full failure-mode walkthrough related to developer.salesforce.com, checked against official docs, with linked verified routes.
Steps
Connect to the Salesforce Bayeux (CometD) streaming endpoint and subscribe to a PushTopic or Platform Event channel
Persist the replayId field from each received event message in durable storage on the subscriber side
On reconnect after a gap, set the subscription extension replay value to the last successfully processed replayId
Use replayId -1 to replay all retained events from the start of the retention window, or -2 to receive only new events
Confirm the retention window for your event type (Platform Events default to 72 hours) and plan replay strategy accordingly
Implement idempotent processing so that replayed duplicate events do not cause side effects
Known gotchas
ReplayId values are not sequential integers that increment predictably; treat them as opaque cursors and never compute the next one arithmetically
If the subscriber falls behind the retention window, events are permanently lost; there is no catch-up beyond the window boundary
CometD reconnection resets the channel subscription and you must re-send the replay extension on the new subscription handshake
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