sijie commented on issue #5969: Acked messages unexpectedly redelivered when others are negatively acked URL: https://github.com/apache/pulsar/issues/5969#issuecomment-570012288 I think the fundamental problem of #5891 #5969 is the *cursor* in tracking at batch level not at message level. Hence failures can result in redelivering the whole batch. In order to address the fundamental problem here, we need to improve the cursor tracking at the message level in the broker side. Loop in @jiazhai @codelipenghui in the discussion.
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