Comment 1 for bug 1254795

As mentioned in the description, it's not just nova-api processes. Below is a ps output after running unstack:

ps -ef | grep nova
jdob 3291 1 0 15:34 ? 00:00:46 /usr/bin/python /usr/bin/nova-api
jdob 3746 1 0 15:34 ? 00:00:21 /usr/bin/python /usr/bin/nova-conductor --config-file /etc/nova/nova.conf
jdob 4034 1 0 15:34 ? 00:00:04 /usr/bin/python /usr/bin/nova-network --config-file /etc/nova/nova.conf
jdob 4148 1 0 15:34 ? 00:00:04 /usr/bin/python /usr/bin/nova-scheduler --config-file /etc/nova/nova.conf
jdob 4535 1 0 15:34 ? 00:00:04 /usr/bin/python /usr/bin/nova-consoleauth --config-file /etc/nova/nova.conf
jdob 12074 3291 0 16:59 ? 00:00:00 /usr/bin/python /usr/bin/nova-api
jdob 12075 3291 0 16:59 ? 00:00:00 /usr/bin/python /usr/bin/nova-api
jdob 12078 3291 0 16:59 ? 00:00:00 /usr/bin/python /usr/bin/nova-api
jdob 12079 3291 0 16:59 ? 00:00:00 /usr/bin/python /usr/bin/nova-api
jdob 12080 3291 0 16:59 ? 00:00:00 /usr/bin/python /usr/bin/nova-api
jdob 12081 3291 0 16:59 ? 00:00:00 /usr/bin/python /usr/bin/nova-api
jdob 12082 3291 0 16:59 ? 00:00:00 /usr/bin/python /usr/bin/nova-api
jdob 12083 3291 0 16:59 ? 00:00:00 /usr/bin/python /usr/bin/nova-api
jdob 13801 1 1 17:04 ? 00:00:01 /usr/bin/python /usr/bin/nova-cert --config-file /etc/nova/nova.conf
jdob 13828 1 1 17:04 ? 00:00:01 /usr/bin/python /usr/bin/nova-conductor --config-file /etc/nova/nova.conf
jdob 13854 1 1 17:04 ? 00:00:01 /usr/bin/python /usr/bin/nova-network --config-file /etc/nova/nova.conf
jdob 13870 1 1 17:04 ? 00:00:01 /usr/bin/python /usr/bin/nova-scheduler --config-file /etc/nova/nova.conf
jdob 13887 1 1 17:04 ? 00:00:01 /usr/bin/python /usr/bin/nova-consoleauth --config-file /etc/nova/nova.conf
jdob 14617 3291 8 17:05 ? 00:00:03 /usr/bin/python /usr/bin/nova-api
jdob 14661 3291 9 17:05 ? 00:00:01 /usr/bin/python /usr/bin/nova-api
jdob 14667 3291 7 17:05 ? 00:00:00 /usr/bin/python /usr/bin/nova-api
jdob 14675 3291 10 17:05 ? 00:00:00 /usr/bin/python /usr/bin/nova-api