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<p style="margin: 10px 0 0 0">The ability to disable the cleanup for certain servers would help the issue. </p>
<p style="margin: 10px 0 0 0">We do have logs for the issue. Is there a specific log/message that you want to see?</p>
<p style="margin: 10px 0 0 0">Here is an explanation of what we saw. On the SQL Server we were able to see lots of blocking including one session that blocked 1659 other queries of all types. That is when the asp.net errors and isapi failures occurred. What we think happened is a delete query ran that locked the table. Then a user tried to login but had to wait because of the lock. They were impatient and tried again and again and so on and that happened for multiple users. This caused multiple database sessions to be created to update the same database row. When the delete lock was released it tried to process these updates but ended up being deadlocked because they wanted the same row. These deadlocks in turn caused more locking specifically of deletes which caused more insert/select/update/delete locking etc. And you have a cascade of locks that results in an outage. The update deadlocking looks to be related to <a href="https://issues.shibboleth.net/jira/browse/SSPCPP-636" title="NameID reverse cache prevents SP to sustain heavy load" class="issue-link" data-issue-key="SSPCPP-636" style="color: #3b73af; text-decoration: none">SSPCPP-636</a>. We are going to test out changing the setting mentioned in our performance lab to see if that prevents the issue.</p>
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