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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 | 44a9c74394b4 |
| children | 28aa76443f58 |
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<tal:block metal:define-macro="frame"> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html tal:define="what python:request.form.getvalue('property', request.classname); form request/form/form/value; field request/form/property/value"> <head> <meta http-equiv="Content-Type" tal:attributes="content string:text/html;; charset=${request/client/charset}" /> <title i18n:translate=""> <tal:x i18n:name="what" tal:content="what" i18n:translate="" /> help - <span i18n:name="tracker" tal:replace="config/TRACKER_NAME" /> </title> <script language="Javascript" type="text/javascript" tal:content="structure string:<!-- // this is the name of the field in the original form that we're working on form = window.opener.document.${form}; field = '${field}'; //-->"> </script> <link rel="stylesheet" type="text/css" href="@@file/help.css" /> <script src="@@file/help_controls.js" type="text/javascript"></script> <metal:x define-slot="more-javascript" /> </head> <body onload="resetList();"> <div class="header"> <h1>Roundup Issue Tracker: Help - <tal:block tal:content="what">item</tal:block></h1> </div> <div class="content"> <tal:block metal:define-slot="content">Page content goes here</tal:block> </div> <!-- content --> <div class="footer"> <tal:block metal:define-slot="footer"></tal:block> </div> <!-- footer --> </body> </html> </tal:block> <!-- legend for helper search results --> <thead> <tr metal:define-macro="legend"> <th tal:repeat="prop props" tal:content="prop" i18n:translate=""></th> </tr> </thead> <table width="100%" metal:define-macro="batch_navi" tal:define="prev batch/previous; next batch/next;" tal:condition="python:prev or next"> <tr class="navigation"> <th width="30%"> <a tal:condition="prev" tal:attributes="href python:request.indexargs_url(request.classname, {'@template':'help-list', 'property': property, 'properties': request.form['properties'].value, 'form': request.form['form'].value, '@startwith':prev.first, '@pagesize':prev.size})" i18n:translate="" ><< previous</a> </th> <th i18n:translate="" width="40%"><span tal:replace="batch/start" i18n:name="start" />..<span tal:replace="python: batch.start + batch.length -1" i18n:name="end" /> out of <span tal:replace="batch/sequence_length" i18n:name="total" /> </th> <th width="30%"> <a tal:condition="next" tal:attributes="href python:request.indexargs_url(request.classname, {'@template':'help-list', 'property': property, 'properties': request.form['properties'].value, 'form': request.form['form'].value, '@startwith':next.first, '@pagesize':next.size})" i18n:translate="" >next >></a> </th> </tr> </table>