April 2025
Intermediate to advanced
324 pages
10h 14m
Portuguese (Portugal, Brazil)
Content preview from Criando microsserviços orientados a eventos
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Capítulo 6. Processamento determinístico de fluxos
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Os microsserviços orientados a eventos geralmente têm topologias mais complexas do que as apresentadas no capítulo anterior. Os eventos são consumidos e processados a partir de vários fluxos de eventos, enquanto o processamento com estado (abordado no próximo capítulo) é necessário para resolver muitos problemas de negócios. Os microsserviços também estão sujeitos às mesmas falhas e panes que os sistemas não microsserviços. Não é incomum ter uma mistura de microsserviços processando eventos quase em tempo real, enquanto outros microsserviços recém-iniciados estão recuperando o atraso processando dados históricos.
Eis as três principais questões abordadas neste capítulo:
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Como é que um microsserviço escolhe a ordem dos eventos a processar quando consome a partir de várias partições?
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Como é que um microsserviço lida com eventos fora de ordem e de chegada tardia?
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Como é que garantimos que os nossos microsserviços produzem resultados determinísticos quando processam fluxos em tempo quase real versus quando processam desde o início dos fluxos?
Podemos responder a estas questões examinando os carimbos de data/hora, a programação de eventos, as marcas de água e os tempos de fluxo, e a forma como contribuem para o processamento determinístico. Bugs, erros e alterações na lógica de negócios também exigirão reprocessamento, ...
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