A practical guide to coordinating asynchronous fan-out pipelines using the Wait and Notify processors in Snowflake Openflow (NiFi-based). The pattern uses a HazelcastMapCacheClient as shared state to hold a coordination FlowFile at a gate until all parallel page-processing units have completed. Covers controller service setup, processor configuration, dynamic target count extraction from API responses, signal identifier uniqueness, expiration handling, and common caveats like missed signals and stale Hazelcast map entries.
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