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https://issues.apache.org/jira/browse/AMBARI-17376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15345100#comment-15345100
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Srimanth Gunturi commented on AMBARI-17376:
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Turns out that the default JSON library of Python2 is really slow -
[http://artem.krylysov.com/blog/2015/09/29/benchmark-python-json-libraries/]
Multiple users have suggested
[simplejson|https://pypi.python.org/pypi/simplejson/], which is also available
in Centos base packages.
By switching to simplejson in stack-advisor (1 line change), the loadJson()
calls went from ~1100ms to ~60ms.
*json times:*
{noformat}
loadJson(hosts): 1012 922 938 972 943
loadJson(services) 216 207 208 212 204
dumpJson(): 5 4 4 4 4
{noformat}
*simplejson times:*
{noformat}
loadJson(hosts): 53 52 55 56 53
loadJson(services) 11 11 12 11 11
dumpJson(): 2 2 2 2 2
{noformat}
A call which used to take ~3s now takes ~1s.
> Recommendations request execution takes too long time
> -----------------------------------------------------
>
> Key: AMBARI-17376
> URL: https://issues.apache.org/jira/browse/AMBARI-17376
> Project: Ambari
> Issue Type: Bug
> Components: ambari-server
> Affects Versions: 2.4.0
> Reporter: Srimanth Gunturi
> Assignee: Srimanth Gunturi
> Priority: Critical
> Fix For: 2.4.0
>
> Attachments: RecommendationsBreakdown.png
>
>
> /api/v1/stacks/HDP/versions/2.5/recommendations GET request is executed for a
> long time.
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