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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 | 7146b68ac263 |
| children | 4ac0bbb3e440 |
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<tal:doc metal:use-macro="templates/page/macros/icing" define="edit_ok context/is_edit_ok" > <title metal:fill-slot="head_title"> <tal:if condition="context/id" i18n:translate="" >User <span tal:replace="context/id" i18n:name="id" />: <span tal:replace="context/username" i18n:name="title" /> - <span tal:replace="config/TRACKER_NAME" i18n:name="tracker" /></tal:if> <tal:if condition="not:context/id" i18n:translate="" >New User - <span tal:replace="config/TRACKER_NAME" i18n:name="tracker" /></tal:if> </title> <metal:slot fill-slot="more-javascript"> <script metal:use-macro="templates/page/macros/user_utils" tal:attributes="nonce request/client/client_nonce"></script> <script type="text/javascript" src="@@file/help_controls.js" tal:attributes="nonce request/client/client_nonce"></script> </metal:slot> <tal:block metal:fill-slot="body_title" define="edit_ok context/is_edit_ok"> <span tal:condition="python: not (context.id or edit_ok)" tal:omit-tag="python:1" i18n:translate="">New User</span> <span tal:condition="python: not context.id and edit_ok" tal:omit-tag="python:1" i18n:translate="">New User Editing</span> <span tal:condition="python: context.id and not edit_ok" tal:omit-tag="python:1" i18n:translate="">User<tal:x replace="context/id" i18n:name="id" /></span> <span tal:condition="python: context.id and edit_ok" tal:omit-tag="python:1" i18n:translate="">User<tal:x replace="context/id" i18n:name="id" /> Editing</span> </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" tal:define="required python:'username address'.split()" enctype="multipart/form-data" tal:attributes="action context/designator; onSubmit python:'return checkRequiredFields(\'%s\')'%'\', \''.join(required); "> <table class="form" tal:define=" th_label templates/page/macros/th_label; src_input templates/page/macros/user_src_input; normal_input templates/page/macros/user_normal_input; pw_input templates/page/macros/user_pw_input; confirm_input templates/page/macros/user_confirm_input; edit_ok context/is_edit_ok; "> <tr tal:define="name string:realname; label string:Name; value context/realname; edit_ok edit_ok"> <th metal:use-macro="th_label">Name</th> <td><input name="realname" metal:use-macro="src_input"></td> </tr> <tr tal:define="name string:username; label string:Login Name; value context/username"> <th metal:use-macro="th_label">Login Name</th> <td><input metal:use-macro="src_input"></td> </tr> <tal:if condition="edit_ok"> <tr tal:define="name string:password; label string:Login Password"> <th metal:use-macro="th_label">Login Password</th> <td><input metal:use-macro="pw_input" type="password"></td> </tr> <tr tal:define="name string:password; label string:Confirm Password"> <th metal:use-macro="th_label">Confirm Password</th> <td><input metal:use-macro="confirm_input" type="password"></td> </tr> </tal:if> <tal:if condition="python:request.user.hasPermission('Web Roles')"> <tr tal:define="name string:roles; label string:Roles;"> <th><label for="roles" i18n:translate="">Roles</label></th> <td tal:define="gips context/id"> <tal:subif condition=gips define="value context/roles"> <input metal:use-macro="normal_input"> </tal:subif> <tal:subif condition="not:gips" define="value db/config/NEW_WEB_USER_ROLES"> <input metal:use-macro="normal_input"> </tal:subif> <tal:block i18n:translate="">(to give the user more than one role, enter a comma,separated,list)</tal:block> </td> </tr> </tal:if> <tr tal:define="name string:organisation; label string:Organisation; value context/organisation"> <th metal:use-macro="th_label">Organisation</th> <td><input name="organisation" metal:use-macro="normal_input"></td> </tr> <tr tal:condition="python:edit_ok or context.timezone" tal:define="name string:timezone; label string:Timezone; value context/timezone"> <th metal:use-macro="th_label">Timezone</th> <td><input tal:replace="structure python: utils.tzfield(context.timezone, 'timezone', db.config.DEFAULT_TIMEZONE)"/> </td> </tr> <tr tal:define="name string:address; label string:E-mail address; value context/address"> <th metal:use-macro="th_label">E-mail address</th> <td tal:define="mailto python:context.address.field(id='address'); mklink python:mailto and not edit_ok"> <a href="mailto:calvin@the-z.org" tal:attributes="href string:mailto:$value" tal:content="value" tal:condition="python:mklink">calvin@the-z.org</a> <tal:if condition=edit_ok> <input metal:use-macro="src_input" value="calvin@the-z.org"> </tal:if> </td> </tr> <tr> <th><label for="alternate_addresses" i18n:translate="">Alternate E-mail addresses<br>One address per line</label></th> <td> <textarea rows=5 cols=40 tal:replace="structure context/alternate_addresses/multiline">nobody@nowhere.org anybody@everywhere.net (alternate_addresses) </textarea> </td> </tr> <tr tal:condition="edit_ok"> <td> <input type="hidden" name="@template" value="item"> <input type="hidden" name="@required" value="username,address" tal:attributes="value python:','.join(required)"> </td> <td><input type="submit" value="save" tal:replace="structure context/submit"><!--submit button here--> <input type="reset"> </td> </tr> </table> </form> <tal:block tal:condition="not:context/id" i18n:translate=""> <table class="form"> <tr> <td>Note: </td> <th class="required">highlighted</th> <td> fields are required.</td> </tr> </table> </tal:block> <tal:block tal:condition="context/id" tal:replace="structure context/history" /> </div> </td> </tal:doc>
