November 2017
Beginner to intermediate
290 pages
7h 34m
English
book
Learning Apache Apex
by Ananth Gundabattula, Thomas Weise, Munagala V. Ramanath, David Yan, Kenneth Knowles
Content preview from Learning Apache Apex
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Accumulation Mode
Accumulation Mode tells the operator what to do with the state of the window when a trigger is fired. We will discuss triggers later in the section. There are three supported accumulation modes: ACCUMULATING, DISCARDING, and ACCUMULATING_AND_DISCARDING.
- ACCUMULATING: The state of the window is preserved until purged (usually as a result of window lying beyond the lateness horizon).
- DISCARDING: The state of the window is discarded immediately after firing of a trigger.
- ACCUMULATING_AND_RETRACTING: The state of the window is preserved until purged, but if the state has changed upon a trigger compared to the previous trigger, an additional retraction trigger is fired. This is to tell downstream operators to discard the previous ...
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