use "BacklogQuota.RetentionPolicy.producer_request_hold;"，sendTimeout exceeded(no ack) ,but producer always retry send message！

[startjava]

                // long sizeLimit = 2147483648L;/
                long sizeLimit = 50000L;// 50KB
                int timeLimit = -1;/
                BacklogQuota.RetentionPolicy policy = BacklogQuota.RetentionPolicy.producer_request_hold;
                BacklogQuota quota = BacklogQuota.builder()
                        .limitSize(sizeLimit)
                        .limitTime(timeLimit)
                        .retentionPolicy(policy)
                        .build();
                admin.namespaces().setBacklogQuota(myTenant + "/" + myNameSpace3, quota);

    @Bean("producer6")
    public Producer createProducer6_myTopic6() throws PulsarClientException {
        Producer<String> stringProducer = pulsarClient.newProducer(Schema.STRING)
                .topic(myTopic6)
                .sendTimeout(10, TimeUnit.SECONDS)
                .create();
        return stringProducer;
    }

public class MyMessageListener6 implements MessageListener {
    @Override
    public void received(Consumer consumer, Message msg) {
        System.out.println("MyMessageListener6：" + new String(msg.getData()));
        // consumer.acknowledge(msg);
    }
}

always print：

ERROR 1384 --- [r-client-io-8-1] o.a.pulsar.client.impl.ProducerImpl : [persistent://my-tenant/my-namespace3/my-topic6] [standalone-463-5] Failed to create producer: {"errorMsg":"org.apache.pulsar.broker.service.BrokerServiceException$TopicBacklogQuotaExceededException: Cannot create producer on topic with backlog quota exceeded","reqId":3015334629871480640, "remote":"/192.168.2.24:6650", "local":"/192.168.2.12:51773"}

[startjava]

but doc :
https://pulsar.apache.org/docs/2.11.x/cookbooks-retention-expiry/#backlog-quotas
say ：
The producer holds the message and retris until client configuration sendTimeoutMs is exceeded.

[startjava]

doc：
/** Policy which holds producer's send request until the resource becomes available (or holding times out). */
producer_request_hold,

the "holding times out" representative what time out ??

producer sendtimeout ?? or other ?

[startjava]

@merlimat @tisonkun @MarvinCai

[startjava]

@momo-jun
source comment：
/** Policy which holds producer's send request until the resource becomes available (or holding times out). */
producer_request_hold,

but i run my demo result effect diff。

so , That's what the document says：
（1）Policy which holds producer's send request until the resource becomes available
（2）if Producer's sendTimeout() method is reach times out ，again send message show TimeoutException
??

[momo-jun]

@startjava To my best understanding, when the holding timeout is reached, it's correct for producers to send messages.
@zymap can you pls take a look at this question? Does the holding timeout has the assumption of the resource availability?