couch_set_view,handle_info,\n [{'DOWN' error when user changes the design_doc during rebalance and runs the view query

steps to reproduce

start cluster_run -n4

run mcsodea
python pytests/performance/mcsoda.py memcached-binary://127.0.0.1:12001 json=1 doc-gen=0 doc-cache=0 max-items=10000

when the load is running rebalance in a new node and then modify the view during rebalance

log is also attached