Ask: Add persistent queue for deferred requests

[gptankit]

The current deferred queue implementation uses Go buffered channels which are inherently in-memory structures. As such, they lose all buffered requests in case of service/node restarts and are also limited by system's memory. Few users have requested to add a persistent queue as well. Although there are low chances of queue filling up unless there is a problem elsewhere in the cluster, but I do see certain benefits of building a persistent deferred queue as an alternative -

• Not limited by memory
• Preserve requests across restarts
• Ordering of requests across serviceq nodes

[tkasidakis1996]

Hello !!! Could I pick this up ??