queueing: Fix cluster duplicate handler dying #161
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With python3 the cluster duplicate handler would die from RuntimeErrors due to the items() accessor of the duplicate backlog dict being a view/iterator that doesn't respond well to the dict changing while being iterated. Prevent the RuntimeError by iterating over the items of a copy of the dict while changing the original, similar to what we're doing in the cuckoo job tracke for alomst the same reason already. Fixes scVENUS#160.
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With python3 the cluster duplicate handler would die from RuntimeErrors
due to the items() accessor of the duplicate backlog dict being a
view/iterator that doesn't respond well to the dict changing while being
iterated. Prevent the RuntimeError by iterating over the items of a copy
of the dict while changing the original, similar to what we're doing in
the cuckoo job tracke for alomst the same reason already.
Fixes #160.