回复： I want to know something about dead letter queue with ActiveMQ 5.15.9

["ヤ艾枫o.--" <11...@qq.com>]

Hi 
My  messages in the topic are non persistent messages. And  the message will not enter the dead letter queue.
another things，When the messages in queue enter DLQ. From the console, I can only view the contents of 400 messages in the dead letter queue, although the actual number of messages is greater than 400


------------------ 原始邮件 ------------------
发件人:                                                                                                                        "users"                                                                                    <jb@nanthrax.net&gt;;
发送时间:&nbsp;2021年6月8日(星期二) 下午4:36
收件人:&nbsp;"users"<users@activemq.apache.org&gt;;

主题:&nbsp;Re: I want to know something about dead letter queue with ActiveMQ 5.15.9



Hi,

Maybe your messages in the topic (if I understand correctly) are non persistent messages.

By default, the non persistent messages are not store in the DLQ: only persistent messages go into the DLQ.

If you want to consider non persistent messages for DLQ, you have to enable it with something like (at destination policy level):

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <deadLetterStrategy&gt;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <sharedDeadLetterStrategy processNonPersistent="true" /&gt;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </deadLetterStrategy&gt;

Regards
JB

&gt; Le 8 juin 2021 à 08:36, ヤ艾枫o.-- <1169114186@qq.com&gt; a écrit :
&gt; 
&gt; Hi：
&gt; When I set the expiration time for the message sent to the queue, when the expiration time is up, the message will be stored in the dead letter queue （ActiveMQ.DLQ）
&gt; 
&gt; 
&gt; With the same policy setting, the message will not enter the dead letter queue.
&gt; 
&gt; 
&gt; Does ActiveMQ itself not support storing expired topic messages into dead letter queues? Dead letter queue is only for queue?