merlimat commented on issue #5218: Enabling Deduplication may drop messages URL: https://github.com/apache/pulsar/issues/5218#issuecomment-533632871 @sleungtoast Thanks for reporting. We also discovered this issue and had already a plan for fixing it. @jerrypeng is working on that. The fix is two-fold: * Double check the pending messages and return error to producer when the dup status is uncertain (eg. message is still pending) * Sync back the lastPushed map with the lastStored map after the failures
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