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https://issues.apache.org/jira/browse/KAFKA-19192?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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José Armando García Sancio resolved KAFKA-19192.
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Resolution: Fixed
> Old bootstrap.metadata files cause problems with post-KAFKA-18601 servers
> -------------------------------------------------------------------------
>
> Key: KAFKA-19192
> URL: https://issues.apache.org/jira/browse/KAFKA-19192
> Project: Kafka
> Issue Type: Bug
> Components: controller
> Affects Versions: 4.0.0
> Reporter: Colin McCabe
> Assignee: Colin McCabe
> Priority: Blocker
> Fix For: 4.1.0, 4.0.1
>
>
> Old bootstrap.metadata files cause problems with post-KAFKA-18601 servers.
> When the server tries to read the bootstrap.metadata file, it will fail if
> the metadata.version is older than 3.3-IV3 (feature level 7). This causes
> problems when these clusters are upgraded.
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