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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://issues.shibboleth.net/jira/browse/SSPCPP" style="color: #3b73af; text-decoration: none">Shibboleth SP - C++</a> / <a href="https://issues.shibboleth.net/jira/browse/SSPCPP-670" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-improvement-3333f8f3-3a13-4c83-b609-7aba5e862c44" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom" /></a> <a href="https://issues.shibboleth.net/jira/browse/SSPCPP-670" style="color: #3b73af; text-decoration: none">SSPCPP-670</a>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://issues.shibboleth.net/jira/browse/SSPCPP-670" style="color: #3b73af; text-decoration: none">Session Cleanup for Database Session Storage can cause performance issues</a> </span>
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Issue Type:
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Affects Versions:
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2.5.3
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Assignee:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="cantor.2@osu.edu" id="email_cantor.2@osu.edu" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=cantor.2%40osu.edu" style="color:#3b73af;; color: #3b73af; text-decoration: none">Scott Cantor</a>
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Components:
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Session Cache
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Created:
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01/Oct/15 11:25 AM
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Environment:
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">90 windows servers running the Shibboleth Daemon using Database Session Management. The database is installed on a SQL Server</p>
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Labels:
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Session
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Priority:
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Reporter:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="lsteweod@idp.protectnetwork.org" id="email_lsteweod@idp.protectnetwork.org" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=lsteweod%40idp.protectnetwork.org" style="color:#3b73af;; color: #3b73af; text-decoration: none">lsteweod@idp.protectnetwork.org</a>
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Security Level:
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Standard (Standard bug, may impact functionality but does not represent a security vulnerability )
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Session cleanup interval is defined in the Shibboleth2 file. For the database session management, each web server hosting the Shibboleth Daemon servers as a listener. So each server is trying to cleanup database sessions. As the number of servers increases this causes contention and prolonged locking. For instance, for 90 servers all running the cleanup every 15 minutes, depending on how long the cleanup takes the texts table could be locked for most of the 15 minutes. This is an issue because it blocks new sessions from being created. It can also cause deadlocks which can cause the system to crash. (dll deadlock failure, required app pool recycles to correct)</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Suggestion is to allow session cleanup to be handled at the database level rather than from each web server. Also, an index on the expires column for the texts and strings tables greatly improves performance for these calls and reducing locking between the delete calls and new session creation.</p>
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