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${user/id}"
     tal:content="user/username">username</a>
 </td>
 <td tal:content="python:user.realname.plain() or default">&nbsp;</td>
 <td tal:content="python:user.organisation.plain() or default">&nbsp;</td>
 <td tal:content="python:user.address.email() or default">&nbsp;</td>
 <td tal:condition="context/is_edit_ok">
     <form style="padding:0" method="POST"
           tal:attributes="action string:user${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="">&lt;&lt; previous</a>
      &nbsp;
     </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 &gt;&gt;</a>
      &nbsp;
     </th>
    </tr>
   </table>
  </th>
 </tr>

</table>
</td>



</tal:block>

Roundup Issue Tracker: http://roundup-tracker.org/