修改kafka數據保存時間

./kafka-topics.sh --zookeeper localhost:2181 --alter --topic HIK_TOPIC --config retention.ms=60000
	./kafka-configs.sh --zookeeper localhost:2181 --alter --entity-name SNAP_IMAGE_INFO_TOPIC --entity-type topics --add-config retention.ms=10800000
	./kafka-configs.sh --zookeeper localhost:2181 --describe --entity-name SNAP_IMAGE_INFO_TOPIC --entity-type topics
	1)統計80端口鏈接數

netstat -nat|grep -i "80"|wc -l