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Try to handle multiple connections better.
The session database is a hot spot. When multiple requests (e.g. 20)
come in at the same time session database contention can get great.
The original code didn't retry session database access when the open
failed. This resulted in errors at the client.
The second pass delayed 0.01 seconds and retried. It was better but we
still had multiple second stalls. I think the first request got in,
everybody else backed up and then retried at the same time. Again they
stepped on each other. With logging I would see many counters go all
the way to low single digits or to -1 indicating falure.
This pass uses randomint to generate delays from 0-.125 seconds in 5ms
increments. This performs better in testing. I rarely saw a counter
less than 13 (2 failed retries). Current logging starts after 6
failures and counts down until success or failure.
| author | John Rouillard <rouilj@ieee.org> |
|---|---|
| date | Thu, 16 Dec 2021 20:02:00 -0500 |
| parents | c2d0d3e9099d |
| children |
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<tal:block metal:use-macro="templates/page/macros/icing"> <title metal:fill-slot="head_title" i18n:translate="" ><span tal:replace="python:context._classname.capitalize()" i18n:name="class" /> editing - <span i18n:name="tracker" tal:replace="config/TRACKER_NAME" /></title> <tal:block metal:fill-slot="body_title" i18n:translate="" ><span tal:replace="python:context._classname.capitalize()" i18n:name="class" /> editing</tal:block> <td class="content" metal:fill-slot="content"> <p tal:condition="python:not (context.is_view_ok() or request.user.hasRole('Anonymous'))" i18n:translate=""> You are not allowed to view this page.</p> <p tal:condition="python:not context.is_view_ok() and request.user.hasRole('Anonymous')" i18n:translate=""> Please login with your username and password.</p> <div tal:condition="context/is_view_ok"> <form method="POST" onSubmit="return submit_once()" enctype="multipart/form-data" tal:condition="context/is_view_ok" tal:attributes="action context/designator"> <input type="hidden" name="@template" value="item"> <table class="form"> <tr tal:repeat="prop python:db[context._classname].properties()"> <tal:block tal:condition="python:prop._name not in ('id', 'creator', 'creation', 'actor', 'activity')"> <th tal:content="prop/_name"></th> <td tal:content="structure python:context[prop._name].field()"></td> </tal:block> </tr> <tr> <td> </td> <td colspan=3 tal:content="structure context/submit"> submit button will go here </td> </tr> </table> </form> <tal:block tal:condition="context/id" tal:replace="structure context/history" /> </div> </td> </tal:block>