Aled Sage created BROOKLYN-399:
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             Summary: aws-ec2 provisoining: retrieving images from every 
region, rather than just one (inefficient!)
                 Key: BROOKLYN-399
                 URL: https://issues.apache.org/jira/browse/BROOKLYN-399
             Project: Brooklyn
          Issue Type: Bug
    Affects Versions: 0.9.0
            Reporter: Aled Sage
            Assignee: Aled Sage


When provisioning a VM in an AWS region (using {{location: 
aws-ec2:us-east-1}}), it retrieves the details of every region rather than just 
the one specified.

For example, it calls {{DescribeAvailabilityZones}} in every region, and 
{{DescribeImages}} in every region.

This is (a lot of!) unnecessary extra work that the Brooklyn server is doing.

It might also increases our changes of being rate-limited (if multiple apps are 
deploying to different regions concurrently).

Below is the output showing the API calls we made:
{noformat}
grep -E "InvokeHttpMethod.* invoking 
|JavaUrlHttpCommandExecutorService.*(Sending request|Receiving response)" 
brooklyn.debug.log

2016-11-23 15:51:39,908 DEBUG o.j.r.i.InvokeHttpMethod [main]: >> invoking 
DescribeRegions
2016-11-23 15:51:40,057 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [main]: 
Sending request -1293445899: POST https://ec2.us-east-1.amazonaws.com/ HTTP/1.1
2016-11-23 15:51:40,891 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [main]: 
Receiving response -1293445899: HTTP/1.1 200 OK
2016-11-23 15:51:46,532 DEBUG o.j.r.i.InvokeHttpMethod [main]: >> invoking 
DescribeAvailabilityZones
2016-11-23 15:51:46,537 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [main]: 
Sending request -586747076: POST https://ec2.eu-central-1.amazonaws.com/ 
HTTP/1.1
2016-11-23 15:51:46,729 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [main]: 
Receiving response -586747076: HTTP/1.1 200 OK
2016-11-23 15:51:46,740 DEBUG o.j.r.i.InvokeHttpMethod [main]: >> invoking 
DescribeAvailabilityZones
2016-11-23 15:51:46,745 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [main]: 
Sending request -1119368789: POST https://ec2.sa-east-1.amazonaws.com/ HTTP/1.1
2016-11-23 15:51:47,896 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [main]: 
Receiving response -1119368789: HTTP/1.1 200 OK
2016-11-23 15:51:47,902 DEBUG o.j.r.i.InvokeHttpMethod [main]: >> invoking 
DescribeAvailabilityZones
2016-11-23 15:51:47,908 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [main]: 
Sending request -684139233: POST https://ec2.ap-northeast-1.amazonaws.com/ 
HTTP/1.1
2016-11-23 15:51:49,748 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [main]: 
Receiving response -684139233: HTTP/1.1 200 OK
2016-11-23 15:51:49,755 DEBUG o.j.r.i.InvokeHttpMethod [main]: >> invoking 
DescribeAvailabilityZones
2016-11-23 15:51:49,758 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [main]: 
Sending request -1706527358: POST https://ec2.eu-west-1.amazonaws.com/ HTTP/1.1
2016-11-23 15:51:49,949 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [main]: 
Receiving response -1706527358: HTTP/1.1 200 OK
2016-11-23 15:51:49,955 DEBUG o.j.r.i.InvokeHttpMethod [main]: >> invoking 
DescribeAvailabilityZones
2016-11-23 15:51:49,957 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [main]: 
Sending request -252867372: POST https://ec2.us-east-1.amazonaws.com/ HTTP/1.1
2016-11-23 15:51:50,384 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [main]: 
Receiving response -252867372: HTTP/1.1 200 OK
2016-11-23 15:51:50,390 DEBUG o.j.r.i.InvokeHttpMethod [main]: >> invoking 
DescribeAvailabilityZones
2016-11-23 15:51:50,393 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [main]: 
Sending request 1267838460: POST https://ec2.us-west-1.amazonaws.com/ HTTP/1.1
2016-11-23 15:51:51,138 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [main]: 
Receiving response 1267838460: HTTP/1.1 200 OK
2016-11-23 15:51:51,145 DEBUG o.j.r.i.InvokeHttpMethod [main]: >> invoking 
DescribeAvailabilityZones
2016-11-23 15:51:51,147 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [main]: 
Sending request 679642982: POST https://ec2.us-west-2.amazonaws.com/ HTTP/1.1
2016-11-23 15:51:51,829 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [main]: 
Receiving response 679642982: HTTP/1.1 200 OK
2016-11-23 15:51:51,835 DEBUG o.j.r.i.InvokeHttpMethod [main]: >> invoking 
DescribeAvailabilityZones
2016-11-23 15:51:51,838 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [main]: 
Sending request 186208934: POST https://ec2.ap-southeast-2.amazonaws.com/ 
HTTP/1.1
2016-11-23 15:51:53,325 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [main]: 
Receiving response 186208934: HTTP/1.1 200 OK
2016-11-23 15:51:53,331 DEBUG o.j.r.i.InvokeHttpMethod [main]: >> invoking 
DescribeAvailabilityZones
2016-11-23 15:51:53,334 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [main]: 
Sending request -1354539746: POST https://ec2.ap-southeast-1.amazonaws.com/ 
HTTP/1.1
2016-11-23 15:51:55,317 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [main]: 
Receiving response -1354539746: HTTP/1.1 200 OK
2016-11-23 15:51:55,402 DEBUG o.j.r.i.InvokeHttpMethod [user thread 8]: >> 
invoking DescribeImages
2016-11-23 15:51:55,402 DEBUG o.j.r.i.InvokeHttpMethod [user thread 10]: >> 
invoking DescribeImages
2016-11-23 15:51:55,402 DEBUG o.j.r.i.InvokeHttpMethod [user thread 7]: >> 
invoking DescribeImages
2016-11-23 15:51:55,402 DEBUG o.j.r.i.InvokeHttpMethod [user thread 6]: >> 
invoking DescribeImages
2016-11-23 15:51:55,405 DEBUG o.j.r.i.InvokeHttpMethod [user thread 12]: >> 
invoking DescribeImages
2016-11-23 15:51:55,406 DEBUG o.j.r.i.InvokeHttpMethod [user thread 11]: >> 
invoking DescribeImages
2016-11-23 15:51:55,406 DEBUG o.j.r.i.InvokeHttpMethod [user thread 5]: >> 
invoking DescribeImages
2016-11-23 15:51:55,402 DEBUG o.j.r.i.InvokeHttpMethod [user thread 2]: >> 
invoking DescribeImages
2016-11-23 15:51:55,402 DEBUG o.j.r.i.InvokeHttpMethod [user thread 9]: >> 
invoking DescribeImages
2016-11-23 15:51:55,407 DEBUG o.j.r.i.InvokeHttpMethod [user thread 4]: >> 
invoking DescribeImages
2016-11-23 15:51:55,411 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 12]: Sending request 330550067: POST 
https://ec2.ap-southeast-1.amazonaws.com/ HTTP/1.1
2016-11-23 15:51:55,411 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 7]: Sending request -348882795: POST 
https://ec2.eu-west-1.amazonaws.com/ HTTP/1.1
2016-11-23 15:51:55,412 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 5]: Sending request 1825720062: POST 
https://ec2.sa-east-1.amazonaws.com/ HTTP/1.1
2016-11-23 15:51:55,412 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 8]: Sending request 489719034: POST https://ec2.us-east-1.amazonaws.com/ 
HTTP/1.1
2016-11-23 15:51:55,411 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 10]: Sending request 96455669: POST https://ec2.us-west-2.amazonaws.com/ 
HTTP/1.1
2016-11-23 15:51:55,413 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 6]: Sending request -79242123: POST 
https://ec2.ap-northeast-1.amazonaws.com/ HTTP/1.1
2016-11-23 15:51:55,411 DEBUG o.j.r.i.InvokeHttpMethod [user thread 3]: >> 
invoking DescribeImages
2016-11-23 15:51:55,416 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 11]: Sending request 1188482435: POST 
https://ec2.ap-southeast-2.amazonaws.com/ HTTP/1.1
2016-11-23 15:51:55,416 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 4]: Sending request -1824164655: POST 
https://ec2.us-west-2.amazonaws.com/ HTTP/1.1
2016-11-23 15:51:55,417 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 2]: Sending request -1306355801: POST 
https://ec2.us-east-1.amazonaws.com/ HTTP/1.1
2016-11-23 15:51:55,420 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 3]: Sending request 1301021373: POST 
https://ec2.eu-central-1.amazonaws.com/ HTTP/1.1
2016-11-23 15:51:55,421 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 9]: Sending request 607419236: POST https://ec2.us-west-1.amazonaws.com/ 
HTTP/1.1
2016-11-23 15:51:56,022 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 3]: Receiving response 1301021373: HTTP/1.1 200 OK
2016-11-23 15:51:56,466 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 7]: Receiving response -348882795: HTTP/1.1 200 OK
2016-11-23 15:51:56,909 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 2]: Receiving response -1306355801: HTTP/1.1 200 OK
2016-11-23 15:51:56,958 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 5]: Receiving response 1825720062: HTTP/1.1 200 OK
2016-11-23 15:51:56,958 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 9]: Receiving response 607419236: HTTP/1.1 200 OK
2016-11-23 15:51:57,081 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 4]: Receiving response -1824164655: HTTP/1.1 200 OK
2016-11-23 15:51:57,190 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 10]: Receiving response 96455669: HTTP/1.1 200 OK
2016-11-23 15:51:57,205 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 12]: Receiving response 330550067: HTTP/1.1 200 OK
2016-11-23 15:51:57,267 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 8]: Receiving response 489719034: HTTP/1.1 200 OK
2016-11-23 15:51:57,283 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 6]: Receiving response -79242123: HTTP/1.1 200 OK
2016-11-23 15:51:57,371 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 11]: Receiving response 1188482435: HTTP/1.1 200 OK
2016-11-23 15:52:00,883 DEBUG o.j.r.i.InvokeHttpMethod [user thread 4]: >> 
invoking DescribeImages
2016-11-23 15:52:00,888 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 4]: Sending request 2102082252: POST 
https://ec2.eu-west-1.amazonaws.com/ HTTP/1.1
2016-11-23 15:52:01,616 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 4]: Receiving response 2102082252: HTTP/1.1 200 OK
2016-11-23 15:53:05,250 DEBUG o.j.h.i.JavaUrlHttpCommandExecutorService [user 
thread 1]: Sending request 562982793: POST https://ec2.us-east-1.amazonaws.com/ 
HTTP/1.1
{noformat}

Digging into the jclouds code a bit, the {{AWSEC2ImageSupplier}} is constructed 
with {{@Region Supplier<Set<String>> regions}} which delegates to 
{{DescribeRegionsForRegionURIs}}. This will return all regions, unless 
{{RegionIdsFromConfiguration}} is configured with the property 
{{"jclouds.regions"}} which is used as a filter. After getting the regions, It 
then calls {{DescribeImagesParallel}}, which calls {{describeImagesInRegion}} 
on each of the given regions.

We can configure this easily in Brooklyn's {{ComputeServiceRegistryImpl}} to 
set the property {{"jclouds.regions"}}. 

Testing this, the time for resolving the template etc (not counting the VM 
provisioning) goes from 110 seconds, down to 10 seconds!

The memory usage also improves massively. In a simple test where we resolve the 
template but skip the VM provisioning, the memory usage peaked at 173MB. With 
the "jclouds.regions" property set, it only peaked at 61MB.




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