During production environment use, the DGRAPH query is blocked and not responsive until it times out?

Issues Dgraph Clients
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6

the cluster config

nohup ./dgraphv2011 zero  --my 10.4.19.91:5180  --port_offset 100 --replicas 3 --v 3 > zero.log &
nohup ./dgraphv2011 alpha --whitelist 10.4.0.0:10.5.0.0 --port_offset 100 --lru_mb 42000 --my 10.4.19.91:7180 --zero 10.4.19.91:5180 --v 3 > dgraph.log &

nohup ./dgraphv2011 alpha --whitelist 10.4.0.0:10.5.0.0 --port_offset 100 --lru_mb 42000 --my 10.4.19.92:7180 --zero 10.4.19.91:5180 --v 3 > dgraph.log &
nohup ./dgraphv2011 alpha --whitelist 10.4.0.0:10.5.0.0 --port_offset 100 --lru_mb 42000 --my 10.4.30.26:7180 --zero 10.4.19.91:5180 --v 3 > dgraph.log &