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https://issues.apache.org/jira/browse/KAFKA-16969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Luke Chen resolved KAFKA-16969.
-------------------------------
    Fix Version/s: 3.8.0
                   3.7.1
         Assignee: Igor Soarez
       Resolution: Fixed

> KRaft unable to upgrade to v3.7.1 and later when multiple log dir is set
> ------------------------------------------------------------------------
>
>                 Key: KAFKA-16969
>                 URL: https://issues.apache.org/jira/browse/KAFKA-16969
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions: 3.8.0, 3.7.1
>            Reporter: Luke Chen
>            Assignee: Igor Soarez
>            Priority: Blocker
>             Fix For: 3.8.0, 3.7.1
>
>
> After KAFKA-16606, we added validation metadata version for JBOD support. 
> This validation works well in isolated KRaft mode (i.e. separate 
> controller/broker node). But when in combined mode, this validation will let 
> the node fail to startup. The log will be like this:
> {code:java}
> [2024-06-15 16:00:45,621] INFO [BrokerServer id=1] Waiting for the broker 
> metadata publishers to be installed (kafka.server.BrokerServer)
> [2024-06-15 16:00:45,621] INFO [BrokerServer id=1] Finished waiting for the 
> broker metadata publishers to be installed (kafka.server.BrokerServer)
> [2024-06-15 16:00:45,621] INFO [BrokerServer id=1] Waiting for the controller 
> to acknowledge that we are caught up (kafka.server.BrokerServer)
> [2024-06-15 16:00:45,621] INFO [MetadataLoader id=1] InitializeNewPublishers: 
> initializing MetadataVersionPublisher(id=1) with a snapshot at offset 4 
> (org.apache.kafka.image.loader.MetadataLoader)
> [2024-06-15 16:00:45,621] ERROR Encountered metadata publishing fault: Broker 
> configuration does not support the cluster MetadataVersion 
> (org.apache.kafka.server.fault.LoggingFaultHandler)
> java.lang.IllegalArgumentException: requirement failed: Multiple log 
> directories (aka JBOD) are not supported in the current MetadataVersion 
> 3.6-IV2. Need 3.7-IV2 or higher
>     at scala.Predef$.require(Predef.scala:337)
>     at 
> kafka.server.KafkaConfig.validateWithMetadataVersion(KafkaConfig.scala:2545)
>     at 
> kafka.server.MetadataVersionConfigValidator.onMetadataVersionChanged(MetadataVersionConfigValidator.java:62)
>     at 
> kafka.server.MetadataVersionConfigValidator.onMetadataUpdate(MetadataVersionConfigValidator.java:55)
>     at 
> org.apache.kafka.image.loader.MetadataLoader.initializeNewPublishers(MetadataLoader.java:309)
>     at 
> org.apache.kafka.image.loader.MetadataLoader.lambda$scheduleInitializeNewPublishers$0(MetadataLoader.java:266)
>     at 
> org.apache.kafka.queue.KafkaEventQueue$EventContext.run(KafkaEventQueue.java:127)
>     at 
> org.apache.kafka.queue.KafkaEventQueue$EventHandler.handleEvents(KafkaEventQueue.java:210)
>     at 
> org.apache.kafka.queue.KafkaEventQueue$EventHandler.run(KafkaEventQueue.java:181)
>     at java.base/java.lang.Thread.run(Thread.java:1623)
> [2024-06-15 16:00:45,622] ERROR Encountered fatal fault: Unhandled error 
> initializing MetadataVersionPublisher(id=1) with a snapshot at offset 4 
> (org.apache.kafka.server.fault.ProcessTerminatingFaultHandler)
> org.apache.kafka.server.fault.FaultHandlerException: Broker configuration 
> does not support the cluster MetadataVersion
>     at scala.Predef$.require(Predef.scala:337)
>     at 
> kafka.server.KafkaConfig.validateWithMetadataVersion(KafkaConfig.scala:2545)
>     at 
> kafka.server.MetadataVersionConfigValidator.onMetadataVersionChanged(MetadataVersionConfigValidator.java:62)
>     at 
> kafka.server.MetadataVersionConfigValidator.onMetadataUpdate(MetadataVersionConfigValidator.java:55)
>     at 
> org.apache.kafka.image.loader.MetadataLoader.initializeNewPublishers(MetadataLoader.java:309)
>     at 
> org.apache.kafka.image.loader.MetadataLoader.lambda$scheduleInitializeNewPublishers$0(MetadataLoader.java:266)
>     at 
> org.apache.kafka.queue.KafkaEventQueue$EventContext.run(KafkaEventQueue.java:127)
>     at 
> org.apache.kafka.queue.KafkaEventQueue$EventHandler.handleEvents(KafkaEventQueue.java:210)
>     at 
> org.apache.kafka.queue.KafkaEventQueue$EventHandler.run(KafkaEventQueue.java:181)
>     at java.base/java.lang.Thread.run(Thread.java:1623)
> Caused by: java.lang.IllegalArgumentException: requirement failed: Multiple 
> log directories (aka JBOD) are not supported in the current MetadataVersion 
> 3.6-IV2. Need 3.7-IV2 or higher
>     ... 10 more{code}
>  
> This will block combined node setting multiple log dirs upgrade to v3.7.1 or 
> later.



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