We are using openldap 2.4.26 with BDB 4.8 and have replication set up in mirror mode for our main ldap database. There are a couple of other replicas that have a subset of the data that the main cluster has but we are seeing the following behavior on all of them.<div>
<br></div><div>When performing mass updates via LDAP, lets say on the order of 30,000 entries being added to existing entries. We&#39;ve noticed that the CPU use of the slapd instances goes through the roof (between 65% and 95% continuously), and seems to stay there until it is restarted.</div>
<div><br></div><div>The Problem is that this system has to be highly available, even for writing and when these updates &quot;shock&quot; the system, the response time goes way down when the process are turning like that. I don&#39;t think they are trying to catch up to the data changes because if I let them run a while after the updates are done. (Talking like 1hr) and then restart the instances, they go back to their normal state.</div>
<div><br></div><div>So far the only way I&#39;ve been able to mitigate the issues is to reconfigure our ldap proxy instances to a machine that is having less trouble, restart the instances that are chugging along, then repoint the proxies back to the one just started, and start the others. Not exactly a quick operation.</div>
<div><br></div><div>I&#39;ve played with cache settings for both OpenLDAP and BDB and have gotten the frequency of this issue reduced but I can&#39;t seem to get rid of it completely and it shows up quite often after large data manipulations. I&#39;m at a loss of how to debug since nothing is crashing. Any suggestions on how to find out what&#39;s causing this would be very helpful. The logs are not throwing any warnings or posting messages that would seem out of the ordinary and I have played with the log settings but nothing seems to relate to anything that might explain why we are seeing CPU usage to go so high.</div>
<div><br></div><div>Thanks in advance<br clear="all"><div><br></div>-- <br>I fly because it releases my mind from the tyranny of petty things . . .<br><br>— Antoine de Saint-Exupéry<br><br>Jeffrey E. Crawford<br>ITS Application Administrator (IDM)<br>
831-459-4365<br><a href="mailto:jeffreyc@ucsc.edu" target="_blank">jeffreyc@ucsc.edu</a><br>
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