Zimbra have created ZBUG-4827 in response to a Support Case we opened where we observed Java was consuming 100% of a mailstore's CPU, sometimes for more than an hour. Note this is on 10.0.13.
This is not the mailbox locking issue that others have experienced; this is due to an issue with the per-user contacts ranking database, where autocomplete doesn't finish in a timely manner. Support noted one instance in our logs where the autocomplete took more than an hour to finish.
You can turn off this feature entirely:
Or, you can reset each impacted user's autocomplete database manually via https://wiki.zimbra.com/wiki/Reset_cont ... te_ranking. But first you have to find out which users are having autocomplete issues.
I wrote a simple zgrep command you can run on each of your mailstores to do that. It looks through mailbox.log files and identifies user accounts whose autocomplete took longer than 2 seconds, and how many times that happened:
I also did a blog post with more details if you are interested: https://www.missioncriticalemail.com/20 ... plete-bug/
Do please consider voting for ZBUG-4827 when it appears on pm.zimbra.com!
Hope that helps,
Mark
This is not the mailbox locking issue that others have experienced; this is due to an issue with the per-user contacts ranking database, where autocomplete doesn't finish in a timely manner. Support noted one instance in our logs where the autocomplete took more than an hour to finish.
You can turn off this feature entirely:
Code:
su - zimbrazmlocalconfig -e contact_ranking_enabled=falsezmmailboxdctl restartI wrote a simple zgrep command you can run on each of your mailstores to do that. It looks through mailbox.log files and identifies user accounts whose autocomplete took longer than 2 seconds, and how many times that happened:
Code:
zgrep -E "autocomplete: overall=([2-9][0-9]{3,}|[0-9]{5,})ms" ~/log/mailbox.log* | grep -o "name=[^;]*" | sort | uniqDo please consider voting for ZBUG-4827 when it appears on pm.zimbra.com!
Hope that helps,
Mark
Statistics: Posted by L. Mark Stone — Tue Apr 22, 2025 2:08 pm
