September 2017
Beginner to intermediate
360 pages
8h 13m
English
book
Practical Real-time Data Processing and Analytics
by Shilpi Saxena, Selva raj Ramasamy, Prateek Bhati, Saurabh Gupta
Content preview from Practical Real-time Data Processing and Analytics
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Opaque transactional Spout
An opaque transactional spout has the following property:
- Every tuple is successfully processed in exactly one batch. However, it's possible for a tuple to fail to process in one batch and then succeed to process in a later batch.
OpaqueTridentKafkaSpout is a spout that has this property and is fault-tolerant to losing Kafka nodes. Whenever it's time for OpaqueTridentKafkaSpout to emit a batch, it emits tuples starting from where the last batch finished emitting. This ensures that no tuple is ever skipped or successfully processed by multiple batches.
Using the following statement in code we can define an opaque transactional spout with Kafka:
OpaqueTridentKafkaSpout otks = new OpaqueTridentKafkaSpout(new TridentKafkaConfig(new ...
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