Add option for acknowledging failed tasks (globally and per-task) #298
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If a task fails with an exception, it is retried until it succeeds. This is contrary to what is said in the documentation: under the "Architecture" section, heading "Broker" (link) it says that even when a task errors, it's still considered a successful delivery. Failed tasks never get acknowledged however, thereby being retried after the timeout period. See also issues #238 and #194.
This patch adds an option to acknowledge failures, thereby closing issue #238. Issue #194 would require some more work. The default of this option is set to
False
, thereby maintaining backwardscompatibility.