zergduan commented on issue #287:
URL:
https://github.com/apache/rocketmq-dashboard/issues/287#issuecomment-2795981644
在dashboard上使用tcpdump抓包（抓取与dashbard和nameserver交互的tcp包）,可以看到：
1. dashboard发送到nameserver以下json
PVPVÖ{Eñ?@@]A
±`
±`ºM¤«ÎdWrù×j
èzdr,é¹µ{"code":206,"extFields":{"AccessKey":"rocketmq","Signature":"jF+WWbN3aTYBc8HXIhdhRulFQgQ="},"flag":0,"language":"JAVA","opaque":42149,"serializeTypeCurrentRPC":"JSON","version":433}
2. nameserver返回：
PVÖ{PVE&Ê@@
±`
±`M¤ºWr«ÎePÞI
r--ºèzdîc{"code":0,"flag":1,"language":"JAVA","opaque":42149,"serializeTypeCurrentRPC":"JSON","version":473}{"topicList":["POC-Cluster","RMQ_SYS_TRANS_HALF_TOPIC","BenchmarkTest","OFFSET_MOVED_EVENT","rmq_sys_REVIVE_LOG_POC-Cluster","SELF_TEST_TOPIC","rmq_sys_SYNC_BROKER_MEMBER_POC-Broker-a","rmq_sys_SYNC_BROKER_MEMBER_POC-Broker-b","SCHEDULE_TOPIC_XXXX","RMQ_SYS_TRACE_TOPIC","%RETRY%CG-TEST-01","RMQ_SYS_TRANS_OP_HALF_TOPIC","TP-TEST-01","POC-Cluster_REPLY_TOPIC","POC-Broker-a","POC-Broker-b"]}
从 nameserver 返回内容可以看出
"rmq_sys_SYNC_BROKER_MEMBER_POC-Broker-a","rmq_sys_SYNC_BROKER_MEMBER_POC-Broker-b"
并没有携带 "%SYS%" 前缀；所以页面中看到的 "%SYS%"
前缀应该是dashboard代码（上面提到的TopicServiceImpl.java）添加的。
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