06 Mar '17, 11am

ruby-kafka: A Ruby client library for Apache Kafka 0.9 #Ruby

Once the client has delivered a set of messages to a Kafka broker the broker will forward them to its replicas, thus ensuring that a single broker failure will not result in message loss. However, the client can choose when the leader acknowledges the write . At one extreme, the client can choose fire-and-forget delivery, not even bothering to check whether the messages have been acknowledged. At the other end, the client can ask the broker to wait until all its replicas have acknowledged the write before returning. This is the safest option, and the default. It's also possible to have the broker return as soon as it has written the messages to its own log but before the replicas have done so. This leaves a window of time where a failure of the leader will result in the messages being lost, although this should not be a common occurrence.

Full article: http://www.rubydoc.info/gems/ruby-kafka

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