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https://issues.apache.org/jira/browse/ARTEMIS-4973?focusedWorklogId=928940&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-928940
 ]

ASF GitHub Bot logged work on ARTEMIS-4973:
-------------------------------------------

                Author: ASF GitHub Bot
            Created on: 06/Aug/24 15:00
            Start Date: 06/Aug/24 15:00
    Worklog Time Spent: 10m 
      Work Description: gaohoward commented on code in PR #5128:
URL: https://github.com/apache/activemq-artemis/pull/5128#discussion_r1705696846


##########
artemis-server/src/main/java/org/apache/activemq/artemis/core/paging/impl/PagingStoreImpl.java:
##########
@@ -228,11 +228,34 @@ private void configureSizeMetric() {
       size.setMax(maxSize, maxSize, maxMessages, maxMessages);
    }
 
+   private boolean validateNewSettings(final AddressSettings addressSettings) {
+
+      Long newPageLimitBytes = addressSettings.getPageLimitBytes();
+
+      if (newPageLimitBytes != null && newPageLimitBytes.longValue() < 0) {
+         newPageLimitBytes = null;
+      }
+      int newPageSize = 
storageManager.getAllowedPageSize(addressSettings.getPageSizeBytes());
+      if (newPageLimitBytes != null && newPageSize > 0) {
+         long newEstimatedMaxPages = newPageLimitBytes / newPageSize;
+         if (this.numberOfPages > newEstimatedMaxPages) {
+            ActiveMQServerLogger.LOGGER.pageSettingsFailedApply(storeName, 
addressSettings, "estimated max pages " + newEstimatedMaxPages + " is less than 
current number of pages " + this.numberOfPages);
+            return false;
+         }
+      }
+      return true;
+   }
+
    /**
     * @param addressSettings
     */
    @Override
    public void applySetting(final AddressSettings addressSettings) {
+
+      if (!validateNewSettings(addressSettings)) {
+         return;
+      }

Review Comment:
   hmm, that's ugly. I think we can do
   1. make sure pageLimitBytes is greater than or equal pageSize (i.e. at least 
one page file should be allowed)
   2. if page store is not running (running flag is false), check the number of 
pages in the store and compare the new max estimated pages, and return false if 
the number of the new estimated pages is smaller than the number of existing 
page files.





Issue Time Tracking
-------------------

    Worklog Id:     (was: 928940)
    Time Spent: 1h 40m  (was: 1.5h)

> pageSizeBytes/pageLimitBytes combination can cause Address full
> ---------------------------------------------------------------
>
>                 Key: ARTEMIS-4973
>                 URL: https://issues.apache.org/jira/browse/ARTEMIS-4973
>             Project: ActiveMQ Artemis
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 2.36.0
>            Reporter: Howard Gao
>            Assignee: Howard Gao
>            Priority: Major
>          Time Spent: 1h 40m
>  Remaining Estimate: 0h
>
> There is an edge case where adjusting pageSizeBytes can cause "Address is 
> full" errors, even though the address is not full.
> Do we need to enforce that pageSizeBytes <= pageLimitBytes?
> Reproducer steps:
> Step 1: configure pageSizeBytes == pageLimitBytes == 1mb:
> $ cat my.broker.properties 
> addressSettings."FOO".pageSizeBytes=1048576
> addressSettings."FOO".pageLimitBytes=1048576
> addressSettings."FOO".maxSizeBytes=1048576
> addressSettings."FOO".pageFullMessagePolicy=FAIL
> addressConfigurations."FOO".routingTypes=MULTICAST
> addressConfigurations."FOO".queueConfigs."FOO".name=FOO
> addressConfigurations."FOO".queueConfigs."FOO".address=FOO
> addressConfigurations."FOO".queueConfigs."FOO".routingType=MULTICAST
> Step 2: run broker
> bin/artemis run --properties my.broker.properties
> Step 3: produce 15 messages
> $ bin/artemis producer --user admin --password admin --destination 
> topic://FOO --message-count 15 --message-size 100000 --protocol amqp
> Step 4: observe paging started on the destination (but the page size is 
> 328kb, can hold more messages)
> INFO  [org.apache.activemq.artemis.core.server] AMQ222038: Starting paging on 
> address 'FOO'; size=1107003 bytes (11 messages); maxSize=1048576 bytes (-1 
> messages); globalSize=1107003 bytes (11 messages); globalMaxSize=1073741824 
> bytes (-1 messages);
> Step 5: stop broker, increase page size
>  cat my.broker.properties 
> addressSettings."FOO".pageSizeBytes=4048576
> ...
> Step 6: run broker, observe logs show paging warning
> 2024-06-25 15:23:47,135 WARN  [org.apache.activemq.artemis.core.server] 
> AMQ224123: Address FOO has more pages than allowed. System currently has 1 
> pages, while the estimated max number of pages is 0 based on the 
> page-limit-bytes (1048576) / page-size (4048576)
> Step 7: try to produce a message, address full
> WARN  [org.apache.activemq.artemis.protocol.amqp.broker.AMQPSessionCallback] 
> AMQ229102: Address "FOO" is full.



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