jeremiaswerner commented on issue #2744: Deploy kafka & zookeeper cluster with ansible URL: https://github.com/apache/incubator-openwhisk/pull/2744#issuecomment-344285888 @devbv many thanks for the update on the review comments and the investigation on latency. I think what you described makes perfect sense and making the ACKS_CONFIG value configurable per environment is the right thing to do. I've done some tests on latency and load of the overall system as well and was not possible to detect a regression. I've tested maximum throughput with a single user/action and with 100 different users. Further checked on latency for different runtimes. All numbers in the same ballpark. Further I've performed some investigations on resiliency under load and found that even with `acks=1` the loss during the outage of a single node seems acceptable. Since OW is latency sensitive I would vote to go with `acks=1` as default and allow a "deployer" to override the default per deployment. We might need a comment on the setting to describe the tradeoff.
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