Page History

...

PickN

Use-case summary: Use PickN when you need to gather a precise number of events from multiple workers.  The ami graph output will update only when N events have been collected.  Note that there is some arithmetic rounding depending on the number of events requested and the number of workers running parallel.

PickN accumulates N events into a list. The GUI node is expanded into 3 underlying PickN graph nodes each with a color of worker, localCollector, and globalCollector. The underlying graph nodes have a different N.

...

The PickN will only update when N events have been collected. There is no guarantee on the order in which events are collected. 

RollingBuffer

Use-case summary: Use RollingBuffer like a circular buffer (or first-in-first-out buffer) that keeps a finite number of events.  The ami graph output updates every event.

RollingBuffer works similarly to the PickN, only it accumulates to a circular buffer, which shifts left after N elements have been accumulated. Unlike the PickN which only returns when N events have collected, the RollingBuffer returns after event.

...