Control node hangs when creating with large amount of networks.

ODL Version : distribution-karaf-0.5.2-Boron-SR2

Openstack Version : mitaka

Setup Details : 1 Control Node + 2 Compute Nodes + 3 ODL Nodes

ODL 3 node:
Configuration:
Harddisk- 50 GB
Core - 4 CPU
RAM - 8 GB Ram

Control Node and Compute Node:
Configuration:
Harddisk- 50 GB
Core - 4 CPU
RAM - 8 GB Ram

Steps to reproduce the issue,
1) ODL Clean and Start:
cd /opt/distribution-karaf-0.5.2-Boron-SR2/bin
rm -rf snapshots journal data
set JAVA_OPTS -Xms128M -Xmx2048m
./karaf

2) OVS Clean
sudo systemctl stop openvswitch
sudo rm -rf /var/log/openvswitch/*
sudo rm -rf /etc/openvswitch/conf.db
sudo systemctl start openvswitch

3) Create 1000 networks and subnets.

4) Issue reproduced at creation of 189th network. Also Control node hangs not able to access it.

5) ODL nodes does not hang and karaf process is running.

Observation:
1) Created 1000 networks using script.
2) When network has reached 189, control node hanged. We couldn't able to proceed further and not able to perform any operation.
3) But all 3 ODLs nodes are working fine.

Attached Karaf logs for all ODLs for your reference

Attached heap memory and jconsole output for your reference.