[GitHub] [pulsar] codelipenghui commented on issue #12510: Failed messages 1 with no more exception message

[GitBox <gi...@apache.org>]

codelipenghui commented on issue #12510:
URL: https://github.com/apache/pulsar/issues/12510#issuecomment-962466338


   @Aaronzk There is an internal pending queue with 1000 messages by default for a producer. if the server-side with a slow response but the application send messages very fast that will fill up the pending queue, so by default, you will get the above exception, it's a fail-fast strategy. 
   
   Another available strategy is to block the caller thread if the pending queue filled up, you can add `.blockIfQueueFull(true)` when creating the producer. 


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