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https://issues.apache.org/jira/browse/ARTEMIS-4087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17631591#comment-17631591
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Clebert Suconic commented on ARTEMIS-4087:
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You only get the 0 messages and globalSize=0 if you are starting the system
with the destination already in paging.
We use a calculated memory estimate to determine when we start paging.. so we
just don't use the 3K body buffer as there's byteBuffers (that if you for
instance have 3K chars, you will have 6K bytes in memory) and other factors.
Your JIRA here is pretty much a question... hence you should have used the
user's forum.
if you confirm this as a bug, please provide a test case or a test procedure to
reproduce an issue. the way I see everything here the system is behaving as
intended.
your destination will be in page mode until you consume all your messages.
And since you are using paging, I would recommend you use 2.27.0 being released
this week, as it will include some good improvements to how we read pages and
cache them in memory.
> 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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