Description of problem:
-------------------------

As a part of  verification of https://bugzilla.redhat.com/show_bug.cgi?id=1526363 , created 300  dist rep volumes

Bricks are multiplexed.

Then proceeded to do vol set in loop.

<snip>

for i in {1..300};do gluster volume create butcher$i replica 2 gqas013.sbu.lab.eng.bos.redhat.com:/bricks1/brickA$i gqas016.sbu.lab.eng.bos.redhat.com:/bricks1/brickA$i gqas006.sbu.lab.eng.bos.redhat.com:/bricks1/brickA$i gqas008.sbu.lab.eng.bos.redhat.com:/bricks1/brickA$i gqas003.sbu.lab.eng.bos.redhat.com:/bricks1/brickA$i gqas007.sbu.lab.eng.bos.redhat.com:/bricks1/brickA$i;gluster v start butcher$i;sleep 2;done ;

followed by 

for i in {1..300};do gluster v set butcher$i cluster.self-heal-daemon off;sleep 3 ;gluster v set butcher$i group metadata-cache;sleep 3;gluster v set butcher$i cluster.lookup-optimize on;sleep 3 ;done


<snip>



Self heal daemon occupies almost 4.6G of Resident space in memory post all volume set operations.


**BEFORE VOL SET ** : 

[root@gqas008 /]# ps aux|grep glus
root      8078 12.4  2.6 28807468 1315220 ?    Ssl  05:13   0:28 /usr/sbin/glusterfs -s localhost --volfile-id gluster/glustershd -p /var/run/gluster/glustershd/glustershd.pid -l /var/log/glusterfs/glustershd.log -S /var/run/gluster/e32d8903c5b60efed5cc4e725235c143.socket --xlator-option *replicate*.node-uuid=cedc8e7d-d3a0-47f2-a50e-ebe12fe964bc


**AFTER VOL SET ** :


[root@gqas008 /]# ps aux|grep glustershd
root      8078  3.0  9.4 31756588 4677648 ?    Ssl  05:13   3:56 /usr/sbin/glusterfs -s localhost --volfile-id gluster/glustershd -p /var/run/gluster/glustershd/glustershd.pid -l /var/log/glusterfs/glustershd.log -S /var/run/gluster/e32d8903c5b60efed5cc4e725235c143.socket --xlator-option *replicate*.node-uuid=cedc8e7d-d3a0-47f2-a50e-ebe12fe964bc



Mem consumption increased from 1.3G to 4.6G.

Since the delta is massive , raising with high prio.

Version-Release number of selected component (if applicable):
--------------------------------------------------------------

[root@gqas008 /]# rpm -qa|grep glus
glusterfs-libs-3.8.4-52.3.el7rhgs.x86_64
glusterfs-server-3.8.4-52.3.el7rhgs.x86_64


How reproducible:
------------------

2/2

Steps to Reproduce:
-------------------

1. Create lots of volumes of type dist-rep (say,300)

2. Disable self heal in loop



Actual results:
----------------

Drastic increase in mem consumption by shd post vol set operations.

Expected results:
------------------

Controlled memory consumption by shd.