topic Trigger.once mode recommendation in Data Engineering

Trigger.once mode recommendation

User16783853906 — Wed, 23 Jun 2021 21:14:56 GMT

When is it recommended to use Trigger.once mode compared to fixed processing intervals with micro batches?

Re: Trigger.once mode recommendation

User16783853906 — Wed, 23 Jun 2021 21:19:20 GMT

With trigger.once mode, only one micro batch will be executed to process the latest data and application stops on its own once the processing is complete. This is helpful in cases where you need to periodically process everything that is available since the last processed data.

Fore more information on this, refer to - https://spark.apache.org/docs/latest/structured-streaming-programming-guide.html#triggers

Re: Trigger.once mode recommendation

brickster_2018 — Wed, 23 Jun 2021 21:26:12 GMT

Also note, the configurations like maxFilesPerTrigger, maxBytesPerTrigger are ignored with Trigger.Once.

Streaming queries with significantly less throughput can switch to Trigger.Once to avoid the continuous execution of the job checking the availability of the data.