Hi folks,
I'm trying to get to the bottom of why my call to list security groups in
nova is very slow.
This is some of my code (scala):
val context = ContextBuilder.newBuilder("openstack-nova")
.endpoint(origin.endpoint)
.credentials(s"${origin.tenant}:${origin.user}", origin.secret)
.build(classOf[ComputeServiceContext])
val compute = context.getComputeService
val securityGroupExtension = compute.getSecurityGroupExtension.get
val secGroups = securityGroupExtension.listSecurityGroups
val result = secGroups.map ( fromJCloud(_, existingGroups) )
Most of this is very quick, but when debugging I see that the call to
listSecurityGroups is slow. In one example run this took 6 minutes and 17
seconds to retrieve 32 security groups.
I've started to dig into this by observing the calls to the API. During the
six minute method call, 93 separate requests are made to the openstack
apis. The first is a call to GET /v2/<id>/extensions and the following 92
are calls to GET /v2/<id>/os-security-groups. These 92 calls all get an
identical response from the API and the calls are made with about 4 seconds
delay.
After all these calls the method returns with 32 records (I'm afraid I
haven't yet verified if the data is correct).
If anyone has any ideas or can point me to the classes that actually carry
out the collection of the data, I'd be grateful.
I also note that I am running this code across a couple of dozen tenants
and only two of them are quite this slow, most complete within a minute.
Many thanks,
Simon
--
Simon Hildrew
Lead Infrastructure Developer
theguardian.com
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