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https://issues.apache.org/jira/browse/ARTEMIS-4087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17631689#comment-17631689
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Marcel Jansen commented on ARTEMIS-4087:
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I understand that Artemis uses a calculated memory estimate to determine when
to start paging. But how do you explain that this behaviour also occurs when
the limits are set to '-1' and thus should be almost unlimited.
When I have a JVM size of 30Gb and the max limits are on default (-1), the only
applicable limit should be global-max-size (which is 15Gb when JVM memory size
is 30Gb). With at max 300.000 messages with an average size of 3kb this is
approximately 1Gb. Do you expect that Artemis starts paging in this situation?
> Artemis starts paging before reaching configured limits
> -------------------------------------------------------
>
> Key: ARTEMIS-4087
> URL: https://issues.apache.org/jira/browse/ARTEMIS-4087
> Project: ActiveMQ Artemis
> Issue Type: Bug
> Affects Versions: 2.23.1, 2.25.0
> Reporter: Marcel Jansen
> Priority: Major
>
> As documented ([Paging · ActiveMQ
> Artemis|https://activemq.apache.org/components/artemis/documentation/2.0.0/paging.html])
> should Artemis start paging when reaching one of the following limits:
> Per queue:
> * max-size-bytes (default: -1, thus unlimited)
> * max-size-messages (default: -1, thus unlimited)
> Global:
> * global-max-size (default: 1/2 of max JVM memory size)
> * global-max-messages (default: -1, thus unlimited)
> In my understanding should Artemis (if not configured otherwise) start paging
> when the global size reaches half the size of the JVM max memory.
> I have tested with both the above settings and specific limits. The JVM has a
> max memory size of 30gb.
> The following log is from a broker with a queue that has approximately 10.000
> messages of 3kb in size (at peak moments this increases to above 300.000
> messages) . Despite of the configured limits the log tells me it starts
> paging:
> {code:java}
> 2022-11-08 14:58:52,282 INFO [org.apache.activemq.artemis.core.server]
> AMQ222038: Starting paging on address 'redacted.queue.name'; size=0 bytes (0
> messages); maxSize=4000000000 bytes (1000000 messages); globalSize=0 bytes (0
> messages); globalMaxSize=16106127360 bytes (-1 messages);{code}
> This is confirmed when I inspect the filesystem:
> {code:java}
> /var/lib/artemis-instance/data/paging$ du -h
> 8.0K ./62bde078-a373-11ec-931e-7ab5b265b3a6
> 161M ./3bd3774b-a32e-11ec-931e-7ab5b265b3a6
> 8.0K ./93ad59a3-df28-11ec-b0a5-8a1ef8f4c99e
> 161M .{code}
> {code:java}
> /var/lib/artemis-instance/data/paging$ ls -l
> 3bd3774b-a32e-11ec-931e-7ab5b265b3a6/
> total 179160
> -rw-rw-r-- 1 artemis artemis 10483423 Nov 8 14:51 000033795.page
> -rw-rw-r-- 1 artemis artemis 10484549 Nov 8 14:53 000033797.page
> -rw-rw-r-- 1 artemis artemis 10483487 Nov 8 14:57 000033802.page
> -rw-r--r-- 1 artemis artemis 10481506 Nov 8 15:04 000033804.page
> -rw-r--r-- 1 artemis artemis 10483474 Nov 8 15:04 000033805.page
> -rw-r--r-- 1 artemis artemis 10484783 Nov 8 15:07 000033806.page
> -rw-r--r-- 1 artemis artemis 10485629 Nov 8 15:12 000033807.page
> -rw-r--r-- 1 artemis artemis 10483845 Nov 8 15:13 000033808.page
> -rw-r--r-- 1 artemis artemis 10484295 Nov 8 15:14 000033809.page
> -rw-r--r-- 1 artemis artemis 10483287 Nov 8 15:15 000033810.page
> -rw-r--r-- 1 artemis artemis 10482534 Nov 8 15:15 000033811.page
> -rw-r--r-- 1 artemis artemis 10483602 Nov 8 15:16 000033812.page
> -rw-r--r-- 1 artemis artemis 10483332 Nov 8 15:16 000033813.page
> -rw-r--r-- 1 artemis artemis 10484324 Nov 8 15:16 000033814.page
> -rw-r--r-- 1 artemis artemis 10484248 Nov 8 15:17 000033815.page
> -rw-r--r-- 1 artemis artemis 10484052 Nov 8 15:17 000033816.page
> -rw-r--r-- 1 artemis artemis 10484635 Nov 8 15:18 000033817.page
> -rw-r--r-- 1 artemis artemis 5128056 Nov 8 15:18 000033818.page
> -rw-rw-r-- 1 artemis artemis 46 Mar 14 2022 address.txt {code}
> Am I missing something in my configuration or is this a bug?
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