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<p style="margin: 10px 0 0 0">The PersistentIdStore API is inherently racy. There's no way for the caller to prevent insertion of two new IDs at the same time, and there's no obvious database constraint that would prevent it because there's no counter column that would overlap if two random IDs were generated independently.</p>
<p style="margin: 10px 0 0 0">I don't see a minimally scoped fix for this that wouldn't be a rewrite, and require a change to the public API, though we can make an exception and take that API private (deprecate the old one).</p>
<p style="margin: 10px 0 0 0">OTOH, it probably is less work than <a href="https://issues.shibboleth.net/jira/browse/IDP-824" title="Consider porting the persistentId attributes to storage API" class="issue-link" data-issue-key="IDP-824" style="color: #3b73af; text-decoration: none">IDP-824</a> is, and I'm still wondering what storage options people could really use other than JDBC anyway. Yes, memcache can be made persistent, but most people don't use it that way, and it's not designed to keep data coherent anyway. And the current format does make things like revoking IDs or what not fairly simple. The storage API version wouldn't be as easy.</p>
<p style="margin: 10px 0 0 0">So I'm leaning toward a rewrite of this code that tries to avoid a storage format change (but might imply adding table constraints that should have been there already).</p>
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