Improve documentation about batching (#5989)
Improve documentation about batching (#5989)

I noticed the documentation around batching didn't clarify some important details about how batching works in Pulsar, and particularly how it interacts with acknowledgements and redeliveries. This is my attempt to provide some clarity.

yahoo/pulsar,yahoo/pulsar,merlimat/pulsar,massakam/pulsar,yahoo/pulsar,yahoo/pulsar,merlimat/pulsar,merlimat/pulsar,massakam/pulsar,merlimat/pulsar,yahoo/pulsar,yahoo/pulsar,merlimat/pulsar,massakam/pulsar,massakam/pulsar,merlimat/pulsar,massakam/pulsar,massakam/pulsar