[12.0 stable] Prevent deferred queue from growing #4028
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…C reqs LOC has different URL, so controller and LOC deferred requests can't be placed into the same queue due to the same requests keys. Having two destinations (controller + LOC), the second sender overrides a deferred item, so first one destination will be never reached. First attempt to fix this was made here: 62b00e2 ("zedcloud/deferred: respect URL argument as a key on starting new deferred") But this introduces more problems then fixes them (for example `RemoveDeferred()` was not covered at all). This is the proper way to deal with different destinations. Signed-off-by: Roman Penyaev <r.peniaev@gmail.com> (cherry picked from commit 713af84)
This fixes the growing deferred queue issue caused by missing request merges. Commit 9f2c9ad ("zedcloud/deferred: don't take lock while processing the deferred queue") relaxes locks and makes it possible to add new requests while queue processing waits in send. New requests should land in the same `deferredItems` list, which should be processed later at the end of the `handleDeferred()` operation. The bug lies in the actual merging of two queues: the one that has not been completed due to a possible error and the other queue, which was populated with new requests during the send. Proper queue merging is not just concatenation of queues (which would cause the resulting queue to always grow), but involves item replacement by key, so the queue size stays the same, with the item being replaced. Signed-off-by: Roman Penyaev <r.peniaev@gmail.com> Fixes: 9f2c9ad ("zedcloud/deferred: don't take lock while processing the deferred queue") Reported-by: Milan Lenco <milan@zededa.com> (cherry picked from commit 4582efb)
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Backport of the #4017 PR.