Haproxy Memory Issue : its old process have occupied hefty memory

@amitgera wrote:

A day before we have taken reload for haproxy and next day we noticed that old process still occupying 4GB memory

~~Trace logs: Top 4 memory occupied processes are :
root@ip-10-0-x-xx:~# ps ax -o rss,user,command | sort -nr | head -n 4
8799424 haproxy /usr/local/sbin/haproxy -f /etc/haproxy/haproxy.cfg -p /var/run/haproxy.pid -D -sf 630
4918408 haproxy /usr/local/sbin/haproxy -f /etc/haproxy/haproxy.cfg -p /var/run/haproxy.pid -D -sf 27615
86292 ganglia /usr/sbin/gmond --pid-file=/var/run/ganglia-monitor.pid
29628 syslog rsyslogd

root@ip-10-0-x-xx:~#ps -ef | grep ha
haproxy 630 1 19 Jul28 ? 5-11:40:10 /usr/local/sbin/haproxy -f /etc/haproxy/haproxy.cfg -p /var/run/haproxy.pid -D -sf 27615
haproxy 13810 1 19 Aug24 ? 03:51:22 /usr/local/sbin/haproxy -f /etc/haproxy/haproxy.cfg -p /var/run/haproxy.pid -D -sf 630

Note:
processid :630 is old one which have occupied approx 4GB of ram
processid :13810 is latest one which have occupied approx 8GB of ram

Then we have checked that old id still have some few connection established :
root@ip-10-0-x-xx:~# lsof -p 630| grep TCP |wc -l
104
Note: 104 here means one for incoming and one for outgoing (i.e backend node)
i.e
root@ip-10-0-x-xx:~# lsof -p 630 | grep -v "ap-southeast-1.compute.internal:1883" |grep TCP |wc -l
52

Please help me understand even with very less number of these connection on old process why it has occupied hefty memory

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