Queue high after upgrade to Zabbix 4.0

[duqa]

Hi All,
yesterday I upgraded my Zabbix server to 4.0 version. After the upgrade, I have a high number of items in queue.
I tried to use more StartPollers but the situation not change. I am using zabbix agent in active mode.

Do I need to change some stuff in the server configuration?

Thanks a lot

[Vovik]

Hi. I have same problem. Increase of preforked pollers/dbsyncers/timers/escalators doesn't have result.
Somewhere i have read that this issue might be occurs when server and agent versions is different.
Possible we need wait for agent version 4.

[kloczek]

Pollers are for passive items.
Check what is in the queue (Administration -> Queue -> Details) of the most delayed items and have closer look on why really those items are delayed.

[Vovik]

I saw it. In version 3.4 all was ok.

Upd. Windows precompiled aqent 4.0.0 included in source tarball. After upgrade it, items queue began almost empty.

[Ranz]

Hi guys,
I have seen the same behavior.
We are running around 800 Active agents (most of them version 3.2+ ) all connected directly to the zabbix sever
Currently monitoring ~ 25K items.

After the upgrade ( which went well ) we had the queue grow from an average of 800 items to above 10K
More then 50 servers were unable to connect - although the installed agent version is 3+ and the same IP was assigned to the version 4

waited a few hours to let the first house keeping process and tidy up the database and sync cache - yet issue remains
tried the same server configuration parameters as version 3.4 and tried increasing values to assign additional resources but nothing helped.
regretfully had to roll back to the 3.4 Image we kept and immediately all agents connected and queue went back to the normal below 1K items value

Any feedback will be appreciated

Cheers
Ran

[stevereaver]

Thought I was going mad, as I have zabbix4 proxy that constantly has queued items, seems I am not the only one. I have changed every parameter and can confirm that the DB is not the issue. I'm at a lose to explain why there are always queued items.

[Jason]

Have you tried increasing the logging level to see what is going on?

[ingus.vilnis]

Apart from the queue graph have you guys observed any other changes in the other internal performance graphs of Zabbix server?

And what about the log files both on Zabbix Server and on the agent side? Check few agents which you have in the queue details page, check the logs on them. Any traces there?

[kloczek]

Thought I was going mad, as I have zabbix4 proxy that constantly has queued items, seems I am not the only one. I have changed every parameter and can confirm that the DB is not the issue. I'm at a lose to explain why there are always queued items.

Instead going mad just check what is going on with sampling monitoring data of those items.
It is quite possible that upgrade uncovered some issue which you've not been aware so far.

[stevereaver]

I wrote up my particular issue here. https://www.zabbix.com/forum/zabbix-...ed-item-checks

[Jason]

After the upgrade ( which went well ) we had the queue grow from an average of 800 items to above 10K
More then 50 servers were unable to connect - although the installed agent version is 3+ and the same IP was assigned to the version 4

How many of your servers that are unable to connect are on version 3 agents? If so what versions? Are servers on version 4 agents able to connect ok?

[dewes]

I am also having a similar problem with the queue after the update to Zabbix 4.0.1. It seems it is displaying wrong or some sort of problem, because the itens on the queue had already been checked but they never clean. Here is some examples, in the first screenshot is the detail from the queue, displaying 5d (since the upgrade) of the object on the queue and the second is the object displaying data gathered today.

[TwiX]

Hi,

I also noticed that issue since upgrade ZBX 3.4 to 4.0.5.

The only way to fix this is to force check by selecting related items and clicking 'check now'.
Indeed, I had the "Problem: More than 100 items having missing data for more than 10 minutes"....

After that, I still have only one item in queue, but when I click on details : => No data found.

[TwiX]

Here are the screenshots.