Hello:
After taking a quick look at your logs, it appears there is some issue with dogtag simply
reading records from the ldap db at a pretty low level. Is there a chance the db became
corrupted at some point or something? Or was this a brand new install of the dogtag
server?
Sorry could not be more help but these symptoms are something I have not seen before.
----- Original Message -----
 From: "Mike Johnson" <m.d.johnson(a)kuub.org>
 To: pki-users(a)redhat.com
 Sent: Friday, November 17, 2017 3:15:23 AM
 Subject: [Pki-users] Slowness and java.lang.ClassCastException
 
 Hi.  I am running a DogTag server as part of a FreeIPA install.  I
 have an issue which has persisted following some directory replication
 issues, now resolved.  I had initially put the slowness down to the
 replication issues but now I find errors in the PKI logs and the
 slowness has persisted.
 
 Though the services are working as intended, it's very slow and in
 particular the API is sitting at 100% load (user) while performing
 operations.
 
 Extracts from the logs are pasted at
 
https://paste.fedoraproject.org/paste/7pz2eBm6KzItXZFFoYpldQ
 
 I'd be very grateful for any guidance as to how to investigate further.
 Thanks!
 
 Mike
 
 Name        : pki-base
 Version     : 10.4.1
 Release     : 13.el7_4
 Kernel: 3.10.0-693.5.2.el7.x86_64
 CentOS 7.4.1708
 FreeIPA v4.5, Domain Level 1.
 
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