GitHub user syhily edited a comment on the discussion: Flink Connector 
Exception: Failed to list subscribed topic partitions due to

@BohanZhang0222 I think the root cause should be some performance issues on 
Pulsar side. Since flink connector requests a lot of metadata informations in 
an extremely short period, the 5xx error could happen easily. We will add rate 
limit and retry logic on connector side. But the core fix should be 
accomplished on the Pulsar side.

You can track the fix progress on the connector here. 
https://github.com/streamnative/flink/issues/162

cc @codelipenghui

GitHub link: 
https://github.com/apache/pulsar/discussions/17200#discussioncomment-3500901

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