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view website/issues/html/user.index.html @ 6565:2c2dbfc332ba
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 | 370cc9052239 |
| children |
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<tal:block metal:use-macro="templates/page/macros/icing"> <title metal:fill-slot="head_title" i18n:translate="">User listing - <span i18n:name="tracker" tal:replace="config/TRACKER_NAME" /></title> <span metal:fill-slot="body_title" tal:omit-tag="python:1" i18n:translate="">User listing</span> <td class="content" metal:fill-slot="content"> <span tal:condition="python:not (context.is_view_ok() or request.user.hasRole('Anonymous'))" i18n:translate="">You are not allowed to view this page.</span> <span tal:condition="python:not context.is_view_ok() and request.user.hasRole('Anonymous')" i18n:translate="">Please login with your username and password.</span> <form tal:condition="context/is_view_ok" method="get" name="itemSynopsis" tal:attributes="action request/classname"> <table class="form" tal:define=" search_input templates/page/macros/search_input;"> <tr><th class="header" colspan="5">Search for users</th></tr> <tr> <th class="header">Username</th> <td tal:define="name string:username"> <input tal:attributes="value python:request.form.getvalue(name) or nothing; name name; id name"/> </td> <th class="header">Realname</th> <td tal:define="name string:realname"> <input tal:attributes="value python:request.form.getvalue(name) or nothing; name name; id name"/> </td> <td><input class="form-small" type="submit" value="Search" i18n:attributes="value"/></td> </tr> </table> <input type="hidden" name="@action" value="search"/> </form> <table width="100%" tal:condition="context/is_view_ok" class="list" tal:define="batch request/batch"> <tr> <th i18n:translate="">Username</th> <th i18n:translate="">Real name</th> <th i18n:translate="">Organisation</th> <th i18n:translate="">Email address</th> <th tal:condition="context/is_edit_ok" i18n:translate="">Retire</th> </tr> <tal:block repeat="user batch"> <tr tal:attributes="class python:['normal', 'alt'][repeat['user'].index%6//3]"> <td> <a tal:attributes="href string:user${user/id}" tal:content="user/username">username</a> </td> <td tal:content="python:user.realname.plain() or default"> </td> <td tal:content="python:user.organisation.plain() or default"> </td> <td tal:content="python:user.address.email() or default"> </td> <td tal:condition="context/is_edit_ok"> <form style="padding:0" method="POST" tal:attributes="action string:user${user/id}"> <input type="hidden" name="@template" value="index"> <input type="hidden" name="@action" value="retire"> <input type="submit" value="retire" i18n:attributes="value"> <input name="@csrf" type="hidden" tal:attributes="value python:utils.anti_csrf_nonce()"> </form> </td> </tr> </tal:block> <tr tal:condition="batch"> <th tal:attributes="colspan python:len(request.columns)"> <table width="100%"> <tr class="navigation"> <th> <a tal:define="prev batch/previous" tal:condition="prev" tal:attributes="href python:request.indexargs_url(request.classname, {'@startwith':prev.first, '@pagesize':prev.size})" i18n:translate=""><< previous</a> </th> <th i18n:translate=""><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> <a tal:define="next batch/next" tal:condition="next" tal:attributes="href python:request.indexargs_url(request.classname, {'@startwith':next.first, '@pagesize':next.size})" i18n:translate="">next >></a> </th> </tr> </table> </th> </tr> </table> </td> </tal:block>
