Previously delete_confirmation was blocked on work_ongoing.
However, if the penciller has a work backlog, work_ongoing may be a recurring problem ... and some files, may remain undeleted long after their use - lifetimes for L0 fails in particular have seen to rise from 10-15s to 5m +.
Letting L0 files linger can have a significant impact on memory. In put-heavy tests (e.g. when testing riak-admin transfers) the memory footprint of a riak node has bene observed peaking more than 80% above normal levels, when compared to using this patch.
This PR allows for deletes to be confirmed even when there is work ongoing, by postponing the updating of the manifest until the manifest is next returned from the clerk.
Co-authored-by: Thomas Arts <thomas.arts@quviq.com>
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