说明
RocketMQ中当重试消息超过最大重试次数（默认16次），会被发送到%DLQ%开头的死信队列，默认死信队列为只写权限。在有些情况下，想看看死信队列里的内容。
更改死信队列权限
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| bin/mqadmin updateTopicPerm -c ClusterB -t %DLQ%online-tst -p 6 -n 192.168.1.x:9876
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option PermSize=128m; support was removed in 8.0
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=128m; support was removed in 8.0
update topic perm from 2 to 6 in 192.168.1.x:10911 success.
update topic perm from 2 to 6 in 192.168.1.x:10911 success.
update topic perm from 2 to 6 in 192.168.1.x:10911 success.
update topic perm from 2 to 6 in 192.168.1.x:10911 success.
注：将死信队列只写权限更改为读写权限
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查询死信队列状态
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| bin/mqadmin topicStatus -n 192.168.1.x:9876 -t %DLQ%online-tst
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option PermSize=128m; support was removed in 8.0
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=128m; support was removed in 8.0
Broker Name QID Min Offset Max Offset Last Updated
broker-a 0 0 109 2018-12-10 18:03:08,732
broker-a 1 0 109 2018-12-10 18:03:08,740
broker-a 2 0 110 2018-12-10 18:03:08,750
broker-a 3 0 109 2018-12-10 18:03:08,728
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根据offset查询消息内容
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| bin/mqadmin queryMsgByOffset -n localhost:9876 -t %DLQ%online-tst -b broker-a -i 0 -o 108
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option PermSize=128m; support was removed in 8.0
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=128m; support was removed in 8.0
OffsetID: 0A090F2800002A9F000000D70519DD35
OffsetID: 0A090F2800002A9F000000D70519DD35
Topic: %DLQ%online-tst
Tags: [null]
Keys: [null]
Queue ID: 0
Queue Offset: 108
CommitLog Offset: 923503549749
Reconsume Times: 0
Born Timestamp: 2018-12-10 17:59:24,731
Store Timestamp: 2018-12-10 18:03:08,732
Born Host: 10.10.128.183:51889
Store Host: 10.9.15.40:10911
System Flag: 0
Properties: {MIN_OFFSET=0, MAX_OFFSET=109, UNIQ_KEY=0A0A80B78DE818B4AAC22FA2493B01B2, WAIT=true}
Message Body Path: /tmp/rocketmq/msgbodys/0A0A80B78DE818B4AAC22FA2493B01B2
注：使用打印命令消息临时存储在/tmp/rocketmq/msgbodys
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查看消息内容
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| cat /tmp/rocketmq/msgbodys/0A0A80B78DE818B4AAC22FA2490F01AE
Hello RocketMQ430
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