[bugfix] fix stuck when ProducerBlockedQuotaExceededException

[billowqiu]

Expected behavior

fail fast when user call Send

Actual behavior

stuck in Send method

Steps to reproduce

1：set a 10MB backlog in pulsar topic 2：Infinite loop call partitionProducer.Send to produce msg to that topic 3：see the sdk output : [Failed to create producer at send PRODUCER request]" error="server error: ProducerBlockedQuotaExceededException: Cannot create producer on topic with backlog quota exceeded" producerID=1

System configuration

Pulsar version: x.y

[merlimat]

@billowqiu The default action is to block the Send() when the quota is full.

You can change the behavior in the namespace (or topic) policies: https://pulsar.apache.org/docs/en/admin-api-namespaces/#configure-backlog-quota-policies

[billowqiu]

@billowqiu The default action is to block the Send() when the quota is full.

You can change the behavior in the namespace (or topic) policies: https://pulsar.apache.org/docs/en/admin-api-namespaces/#configure-backlog-quota-policies

we need producer_exception to detect the qouta is full；Other policies are not appropriate for our scenario.