Hi all,

since we updated our Zabbix Server to version 3.4 we are having a lot of trouble regarding the memory usage of preprocessing manager. The memory usage of this process sporadically raises up to 90% of total server memory and results in OOM process kills on OS level -> In most cases the server itself or the database are beeing killed with a loss of data in result.

Strange fact: This mostly happens on saturdays (I already checked cron-/anacrontab but couldn't find anything).

Steps to reproduce:
-

Result:

1. High CPU and memory usage of preprocessing manager (see "atop_preprocessingmem.PNG" and "atop_proprocessingcpu.PNG")
2. OOM Killer killing processes (see "oom_report.png")
3. Loss of data within zabbix (see "Dataloss.png")

Seems like I am not the only one with this issue: https://www.zabbix.com/forum/showthread.php?p=203975#post203975

Tomorrow I will raise the debug level for preprocessing process as mentioned in ZBX-12791

Thanks in advance!