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https://issues.apache.org/jira/browse/FLINK-15557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17079022#comment-17079022
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Aljoscha Krettek commented on FLINK-15557:
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There is a problem with bumping the version because our Producer was using some
internals that have changed in Kafka 2.3.x. (see
https://issues.apache.org/jira/browse/FLINK-15362?focusedCommentId=17078507&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-17078507).
> Cannot connect to Azure Event Hub/Kafka since Jan 5th 2020. Kafka version
> issue
> -------------------------------------------------------------------------------
>
> Key: FLINK-15557
> URL: https://issues.apache.org/jira/browse/FLINK-15557
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Kafka
> Environment: Java 8, Flink 1.9.1, Azure Event Hub
> Reporter: Chris
> Priority: Blocker
>
> As of Jan 5th we can no longer consume messages from azure event hub using
> Flink 1.9.1. I was able to fix the issue on several of our spring boot
> projects by upgrading to spring boot 2.2.2, kafka 2.3.1, and kafka-clients
> 2.3.1
>
> 2020-01-10 19:36:30,364 WARN org.apache.kafka.clients.NetworkClient -
> [Consumer clientId=consumer-1, groupId=****] Bootstrap broker
> *****.servicebus.windows.net:9093 (id: -1 rack: null) disconnected
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