Made more responsive the check_nodes thread
Made more responsive the check_nodes thread


Former-commit-id: b7754116ad87c972aea8c929b0c4393552a634da [formerly 28e20514e8ae5ff08f8360172099572e72b7132e]
Former-commit-id: b046653834f28ad26fd88fc1c500fe261ae09bd3
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine