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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State storage
As discussed earlier in this section, each window (or each window/key pair when keyed) has its own state. There could be millions of windows or window/key pairs at a time (see the following section for watermark and allowed lateness to limit the number of windows in the state of the operator). How the state is stored and checkpointed is likely to be the most important factor for performance. Apex provides two types of state storage. These are In-Memory Windowed Storage and Spillable Windowed Storage:
- In-Memory Windowed Storage stores the operator state only in memory and the entire state is copied to DFS at checkpoint. This storage is useful only if the state is expected to be small and the cardinality of valid windows and ...
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