[SLING-10123] Distribution agent queue processor should implement a backoff in case of retries for processing an item

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Content Distribution Core 0.4.2
• Fix Version/s: Content Distribution Core 0.4.6
• Component/s: Content Distribution
• Assignee: Timothee Maret
• Reporter: Mohit Arora
• Created: 03/Feb/21 11:50
• Updated: 06/Jul/21 16:05
• Resolved: 16/Mar/21 09:59

Description

In case of recoverable exceptions, distribution agent queue processor does not evict the queue item from the processing queue [0]. Rather, the item is retried infinitely until either the distribution of the item is successful or a non-recoverable exception is thrown for the item. However, since there is "something wrong" because of which an exception is thrown in the first place, we should add a cool off period before trying to reattempt to distribute the same item. This can be achieved through a linear or exponential backoff.

cc - ashishc

[0] https://github.com/apache/sling-org-apache-sling-distribution-core/blob/master/src/main/java/org/apache/sling/distribution/agent/impl/SimpleDistributionAgentQueueProcessor.java#L147-L150