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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 7849d8c7d917
children 2aa045e06fff
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<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="Description"
	  content="Documentation on the Roundup issue tracker, version {{ release|e }}.">
    {{ metatags }}
    {%- if builder != 'htmlhelp' %}
      {%- set titlesuffix = docstitle|e %}
      {%- set titlesuffix = " - " + titlesuffix %}
    {%- endif %}
    <title>{{ title|striptags }}{{ titlesuffix }}</title>
    {%- if builder == 'web' %}
    <link rel="stylesheet" href="{{ pathto('index') }}?do=stylesheet{%
      if in_admin_panel %}&admin=yes{% endif %}" type="text/css" />
    {%- for link, type, title in page_links %}
    <link rel="alternate" type="{{ type|e(true) }}" title="{{ title|e(true) }}" href="{{ link|e(true) }}" />
    {%- endfor %}
    {%- else %}
    <link rel="stylesheet" href="{{ pathto('_static/style.css', 1) }}" type="text/css" />
    <link rel="stylesheet" href="{{ pathto('_static/pygments.css', 1) }}" type="text/css" />

    {%- endif %}
    {%- if builder != 'htmlhelp' %}
    <script type="text/javascript">
      var DOCUMENTATION_OPTIONS = {
          URL_ROOT:    '{{ pathto("", 1) }}',
          VERSION:     '{{ release|e }}',
          COLLAPSE_MODINDEX: false,
          FILE_SUFFIX: '{{ file_suffix }}'
      };
    </script>
    {%- for scriptfile in script_files %}
    <script type="text/javascript" src="{{ pathto(scriptfile, 1) }}"></script>
    {%- endfor %}
    {%- if use_opensearch %}
    <link rel="search" type="application/opensearchdescription+xml"
          title="{% trans docstitle=docstitle|e %}Search within {{ docstitle }}{% endtrans %}"
          href="{{ pathto('_static/opensearch.xml', 1) }}"/>
    {%- endif %}
    {%- if favicon %}
    <link rel="shortcut icon" href="{{ pathto('_static/' + favicon, 1) }}"/>
    {%- endif %}
    {%- endif %}
{%- block linktags %}
    {%- if hasdoc('about') %}
    <link rel="author" title="{{ _('About these documents') }}" href="{{ pathto('about') }}" />
    {%- endif %}
    <link rel="index" title="{{ _('Index') }}" href="{{ pathto('genindex') }}" />
    <link rel="search" title="{{ _('Search') }}" href="{{ pathto('search') }}" />
    {%- if hasdoc('copyright') %}
    <link rel="copyright" title="{{ _('Copyright') }}" href="{{ pathto('copyright') }}" />
    {%- endif %}
    <link rel="top" title="{{ docstitle|e }}" href="{{ pathto('index') }}" />
    {%- if parents %}
    <link rel="up" title="{{ parents[-1].title|striptags }}" href="{{ parents[-1].link|e }}" />
    {%- endif %}
    {%- if next %}
    <link rel="next" title="{{ next.title|striptags }}" href="{{ next.link|e }}" />
    {%- endif %}
    {%- if prev %}
    <link rel="prev" title="{{ prev.title|striptags }}" href="{{ prev.link|e }}" />
    {%- endif %}
{%- endblock %}
{%- block extrahead %} {% endblock %}
  </head>
  <body>
    <div class="header"><h1>Roundup</h1>
      {%- if pagename != "search" %}
        <div id="searchbox" style="display: none">
          <form class="search" action="{{ pathto('search') }}" method="get">
            <input type="text" aria-label="Enter search terms"
		   name="q" size="18" />
            <input type="submit" value="{{ _('Search') }}" />
            <input type="hidden" name="check_keywords" value="yes" />
            <input type="hidden" name="area" value="default" />
          </form>
        </div>
        <script type="text/javascript">$('#searchbox').show(0);</script>
      {%- endif %}
    </div>
    <div class="navigation">
      <div class="menu">
       {{ toctree() }}
      </div>
    </div>
    <div class="content">
	<div id="subnav">
        {%- if prev %}
           <a title="{{ prev.title|striptags }}" href="{{ prev.link|e }}">
	     Prev</a>
        {%- endif %}
	{%- if next %}
           <a title="{{ next.title|striptags }}" href="{{ next.link|e }}">
	     Next</a>
	{%- endif %}
        <a title="{{ _('Index') }}" href="{{ pathto('genindex') }}">
	  Index</a>
	</div>
       {% block body %} {% endblock %}
    </div>
{%- block footer %}
    <div class="footer">
      <div>
      {%- if show_source and has_source and sourcename %}
        <span class="source">[<a href="{{ pathto('_sources/' + sourcename, true)|e }}" rel="nofollow">{{ _('page source') }}</a>]</span>
      {%- endif %}
      {%- if hasdoc('copyright') %}
        {% trans path=pathto('copyright'), copyright=copyright|e %}&copy; <a href="{{ path }}">Copyright</a> {{ copyright }}.{% endtrans %}
      {%- else %}
        {% trans copyright=copyright|e %}&copy; Copyright {{ copyright }}.{% endtrans %}
      {%- endif %}
      </div>
      <div>
      {%- if last_updated %}
        {% trans last_updated=last_updated|e %}Last updated on {{ last_updated }}.{% endtrans %}
      {%- endif %}
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      </div>
    </div>
{%- endblock %}
  </body>
</html>
Roundup Issue Tracker: http://roundup-tracker.org/