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apache/rocketmq/refs/heads/develop_include_3_commits/./docs/en/operation.md
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# Operation Management
---
### 1 Deploy cluster
#### 1.1 Single Master mode
This mode is risky, upon broker restart or broken down, the whole service is unavailable. It's not recommended in production environment, it can be used for local test.
##### 1）Start NameServer
```bash
### Start Name Server
$ nohup sh mqnamesrv &
### check whether Name Server is successfully started
$ tail -f ~/logs/rocketmqlogs/namesrv.log
The Name Server boot success...
```
##### 2）Start Broker
```bash
### start Broker
$ nohup sh bin/mqbroker -n localhost:9876 &
### check whether Name Server is successfully started, eg: Broker's IP is 192.168.1.2, Broker's name is broker-a
$ tail -f ~/logs/rocketmqlogs/Broker.log
The broker[broker-a, 192.169.1.2:10911] boot success...
```
#### 1.2 Multi Master mode
Cluster contains Master node only, no Slave node, eg: 2 Master nodes, 3 Master nodes, advantages and disadvantages of this mode are shown below:
- advantages：simple configuration, single Master node broke down or restart do not impact application. Under RAID10 disk config, even if machine broken down and cannot recover, message do not get lost because of RAID10's high reliable(async flush to disk lost little message, sync to disk do not lost message), this mode get highest performance.
- disadvantages：during the machine's down time, messages have not be consumed on this machine can not be subscribed before recovery. That will impacts message's instantaneity.
##### 1）Start NameServer
NameServer should be started before broker. If under production environment, we recommend start 3 NameServer nodes for high available. Startup command is equal, as shown below:
```bash
### start Name Server
$ nohup sh mqnamesrv &
### check whether Name Server is successfully started
$ tail -f ~/logs/rocketmqlogs/namesrv.log
The Name Server boot success...
```
##### 2）start Broker cluster
```bash
### start the first Master on machine A, eg:NameServer's IP is ：192.168.1.1
$ nohup sh mqbroker -n 192.168.1.1:9876 -c $ROCKETMQ_HOME/conf/2m-noslave/broker-a.properties &
### start the second Master on machine B, eg:NameServer's IP is ：192.168.1.1
$ nohup sh mqbroker -n 192.168.1.1:9876 -c $ROCKETMQ_HOME/conf/2m-noslave/broker-b.properties &
...
```
The above commands only used for single NameServer. In multi NameServer cluster, multi addresses concat by semicolon followed by -n in broker start command.
#### 1.3 Multi Master Multi Slave mode - async replication
Each Master node is equipped with one Slave node, this mode has many Master-Slave group, using async replication for HA, slaver has a lag(ms level) behind master, advantages and disadvantages of this mode are shown below:
- advantages: message lost a little, even if disk is broken; message instantaneity do not loss; Consumer can still consume from slave when master is down, this process is transparency to user, no human intervention is required; Performance is almost equal to Multi Master mode.
- disadvantages: message lost a little data, when Master is down and disk broken.
##### 1）Start NameServer
```bash
### start Name Server
$ nohup sh mqnamesrv &
### check whether Name Server is successfully started
$ tail -f ~/logs/rocketmqlogs/namesrv.log
The Name Server boot success...
```
##### 2）Start Broker cluster
```bash
### start first Master on machine A, eg: NameServer's IP is 192.168.1.1
$ nohup sh mqbroker -n 192.168.1.1:9876 -c $ROCKETMQ_HOME/conf/2m-2s-async/broker-a.properties &
### start second Master on machine B, eg: NameServer's IP is 192.168.1.1
$ nohup sh mqbroker -n 192.168.1.1:9876 -c $ROCKETMQ_HOME/conf/2m-2s-async/broker-b.properties &
### start first Slave on machine C, eg: NameServer's IP is 192.168.1.1
$ nohup sh mqbroker -n 192.168.1.1:9876 -c $ROCKETMQ_HOME/conf/2m-2s-async/broker-a-s.properties &
### start second Slave on machine D, eg: NameServer's IP is 192.168.1.1
$ nohup sh mqbroker -n 192.168.1.1:9876 -c $ROCKETMQ_HOME/conf/2m-2s-async/broker-b-s.properties &
```
#### 1.4 Multi Master Multi Slave mode - synchronous double write
Each Master node is equipped with one Slave node, this mode has many Master-Slave group, using synchronous double write for HA, application's write operation is successful means both master and slave write successful, advantages and disadvantages of this mode are shown below:
- advantages:both data and service have no single point failure, message has no lantancy even if Master is down, service available and data available is very high;
- disadvantages:this mode's performance is 10% lower than async replication mode, sending latency is a little high, in the current version, it do not have auto Master-Slave switch when Master is down.
##### 1）Start NameServer
```bash
### start Name Server
$ nohup sh mqnamesrv &
### check whether Name Server is successfully started
$ tail -f ~/logs/rocketmqlogs/namesrv.log
The Name Server boot success...
```
##### 2）Start Broker cluster
```bash
### start first Master on machine A, eg:NameServer's IP is 192.168.1.1
$ nohup sh mqbroker -n 192.168.1.1:9876 -c $ROCKETMQ_HOME/conf/2m-2s-sync/broker-a.properties &
### start second Master on machine B, eg:NameServer's IP is 192.168.1.1
$ nohup sh mqbroker -n 192.168.1.1:9876 -c $ROCKETMQ_HOME/conf/2m-2s-sync/broker-b.properties &
### start first Slave on machine C, eg: NameServer's IP is 192.168.1.1
$ nohup sh mqbroker -n 192.168.1.1:9876 -c $ROCKETMQ_HOME/conf/2m-2s-sync/broker-a-s.properties &
### start second Slave on machine D, eg: NameServer's IP is 192.168.1.1
$ nohup sh mqbroker -n 192.168.1.1:9876 -c $ROCKETMQ_HOME/conf/2m-2s-sync/broker-b-s.properties &
```
The above Broker matches Slave by specifying the same BrokerName, Master's BrokerId must be 0, Slave's BrokerId must larger than 0. Besides, a Master can have multi Slaves that each has a distinct BrokerId. $ROCKETMQ_HOME indicates RocketMQ's install directory, user needs to set this environment parameter.
### 2 mqadmin management tool
> Attentions：
>
> 1. execute command：`./mqadmin {command} {args}`
> 2. almost all commands need -n indicates NameSerer address, format is ip:port
> 3. almost all commands can get help info by -h
> 4. if command contains both Broker address(-b) and cluster name(-c), it's prior to use broker address. If command do not contains broker address, it will executed on all hosts in this cluster. Support only one broker host. -b format is ip:port, default port is 10911
> 5. there are many commands under tools, but not all command can be used, only commands that initialized in MQAdminStartup can be used, you can modify this class, add or self-define command.
> 6. because of version update, little command do not update timely, please refer to source code directly when occur error.
#### 2.1 Topic
<table border=0 cellpadding=0 cellspacing=0 width=714>
<col width=177>
<col width=175>
<col width=177>
<col width=185>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl63 width=177 style='height:17.0pt;width:133pt'>name</td>
<td class=xl64 width=175 style='width:131pt'>meaning</td>
<td class=xl64 width=177 style='width:133pt'>command items</td>
<td class=xl64 width=185 style='width:139pt'>explaination</td>
</tr>
<tr height=132 style='height:99.0pt'>
<td rowspan=8 height=593 class=xl68 width=163 style='border-bottom:1.0pt;
height:444.0pt;border-top:none;width:122pt'>updateTopic</td>
<td rowspan=8 class=xl70 width=135 style='border-bottom:1.0pt;
border-top:none;width:101pt'>create or update Topic's config</td>
<td class=xl65 width=149 style='width:112pt'>-b</td>
<td class=xl66 width=159 style='width:119pt'>Broker address, means which Broker that topic is located, only support single Broker, address format is ip:port</td>
</tr>
<tr height=132 style='height:99.0pt'>
<td height=132 class=xl65 width=149 style='height:99.0pt;width:112pt'>-c</td>
<td class=xl66 width=159 style='width:119pt'>cluster name, whic cluster that topic belongs to(query cluster info by clusterList)</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl65 width=149 style='height:17.0pt;width:112pt'>-h-</td>
<td class=xl66 width=159 style='width:119pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl65 width=149 style='height:43.0pt;width:112pt'>-n</td>
<td class=xl66 width=159 style='width:119pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=76 style='height:57.0pt'>
<td height=76 class=xl65 width=149 style='height:57.0pt;width:112pt'>-p</td>
<td class=xl66 width=159 style='width:119pt'>assign read write authority to new topic(W=2|R=4|WR=6)</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl65 width=149 style='height:29.0pt;width:112pt'>-r</td>
<td class=xl66 width=159 style='width:119pt'>the count of queue that can be read(default is 8)</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl65 width=149 style='height:29.0pt;width:112pt'>-w</td>
<td class=xl66 width=159 style='width:119pt'>the count of queue that can be wrote(default is 8)</td>
</tr>
<tr height=95 style='height:71.0pt'>
<td height=95 class=xl65 width=149 style='height:71.0pt;width:112pt'>-t</td>
<td class=xl66 width=159 style='width:119pt'>topic name(can only use characters ^[a-zA-Z0-9_-]+$ )</td>
</tr>
<tr height=132 style='height:99.0pt'>
<td rowspan=4 height=307 class=xl68 width=163 style='border-bottom:1.0pt;
height:230.0pt;border-top:none;width:122pt'>deleteTopic</td>
<td rowspan=4 class=xl70 width=135 style='border-bottom:1.0pt;
border-top:none;width:101pt'>delete Topic</td>
<td class=xl65 width=149 style='width:112pt'>-c</td>
<td class=xl66 width=159 style='width:119pt'>cluster name, which cluster that topic will be deleted belongs to(query cluster info by clusterList)</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl65 width=149 style='height:17.0pt;width:112pt'>-h</td>
<td class=xl66 width=159 style='width:119pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl65 width=149 style='height:43.0pt;width:112pt'>-n</td>
<td class=xl66 width=159 style='width:119pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=95 style='height:71.0pt'>
<td height=95 class=xl65 width=149 style='height:71.0pt;width:112pt'>-t</td>
<td class=xl66 width=159 style='width:119pt'>topic name(can only use characters ^[a-zA-Z0-9_-]+$ )</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td rowspan=3 height=287 class=xl68 width=163 style='border-bottom:1.0pt;
height:215.0pt;border-top:none;width:122pt'>topicList</td>
<td rowspan=3 class=xl70 width=135 style='border-bottom:1.0pt;
border-top:none;width:101pt'>query Topic list info</td>
<td class=xl65 width=149 style='width:112pt'>-h</td>
<td class=xl66 width=159 style='width:119pt'>print help info</td>
</tr>
<tr height=207 style='height:155.0pt'>
<td height=207 class=xl65 width=149 style='height:155.0pt;width:112pt'>-c</td>
<td class=xl66 width=159 style='width:119pt'>return topic list only if do not contains -c, if containis -c, it will return cluster name, topic name, consumer group name</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl65 width=149 style='height:43.0pt;width:112pt'>-n</td>
<td class=xl66 width=159 style='width:119pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td rowspan=3 height=103 class=xl68 width=163 style='border-bottom:1.0pt;
height:77.0pt;border-top:none;width:122pt'>topicRoute</td>
<td rowspan=3 class=xl70 width=135 style='border-bottom:1.0pt;
border-top:none;width:101pt'>query Topic's route info</td>
<td class=xl65 width=149 style='width:112pt'>-t</td>
<td class=xl66 width=159 style='width:119pt'>topic name</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl65 width=149 style='height:17.0pt;width:112pt'>-h</td>
<td class=xl66 width=159 style='width:119pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl65 width=149 style='height:43.0pt;width:112pt'>-n</td>
<td class=xl66 width=159 style='width:119pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td rowspan=3 height=103 class=xl68 width=163 style='border-bottom:1.0pt;
height:77.0pt;border-top:none;width:122pt'>topicStatus</td>
<td rowspan=3 class=xl70 width=135 style='border-bottom:1.0pt;
border-top:none;width:101pt'>query Topic's offset</td>
<td class=xl65 width=149 style='width:112pt'>-t</td>
<td class=xl66 width=159 style='width:119pt'>topic name</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl65 width=149 style='height:17.0pt;width:112pt'>-h</td>
<td class=xl66 width=159 style='width:119pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl65 width=149 style='height:43.0pt;width:112pt'>-n</td>
<td class=xl66 width=159 style='width:119pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td rowspan=3 height=103 class=xl68 width=163 style='border-bottom:1.0pt;
height:77.0pt;border-top:none;width:122pt'>topicClusterList</td>
<td rowspan=3 class=xl70 width=135 style='border-bottom:1.0pt;
border-top:none;width:101pt'>query cluster list where Topic belongs to</td>
<td class=xl65 width=149 style='width:112pt'>-t</td>
<td class=xl66 width=159 style='width:119pt'>topic name</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl65 width=149 style='height:17.0pt;width:112pt'>-h</td>
<td class=xl66 width=159 style='width:119pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl65 width=149 style='height:43.0pt;width:112pt'>-n</td>
<td class=xl66 width=159 style='width:119pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td rowspan=6 height=518 class=xl68 width=163 style='border-bottom:1.0pt;
height:380pt;border-top:none;width:122pt'>updateTopicPerm</td>
<td rowspan=6 class=xl70 width=135 style='border-bottom:1.0pt;
border-top:none;width:101pt'>update Topic's produce and consume authority</td>
<td class=xl65 width=149 style='width:112pt'>-t</td>
<td class=xl66 width=159 style='width:119pt'>topic name</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl65 width=149 style='height:17.0pt;width:112pt'>-h</td>
<td class=xl66 width=159 style='width:119pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl65 width=149 style='height:43.0pt;width:112pt'>-n</td>
<td class=xl66 width=159 style='width:119pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=132 style='height:99.0pt'>
<td height=132 class=xl65 width=149 style='height:99.0pt;width:112pt'>-b</td>
<td class=xl66 width=159 style='width:119pt'>Broker address which topic belongs to, support single broker only, format is ip:port</td>
</tr>
<tr height=76 style='height:57.0pt'>
<td height=76 class=xl65 width=149 style='height:57.0pt;width:112pt'>-p</td>
<td class=xl66 width=159 style='width:119pt'>assign read and write authority to the new topic(W=2|R=4|WR=6)</td>
</tr>
<tr height=207 style='height:155.0pt'>
<td height=207 class=xl65 width=149 style='height:155.0pt;width:112pt'>-c</td>
<td class=xl66 width=159 style='width:119pt'>cluster name, which topic belongs to(query cluster info by clusterList), if do not have -b, execute comman an all brokers.</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td rowspan=5 height=199 class=xl68 width=163 style='border-bottom:1.0pt;
height:149.0pt;border-top:none;width:122pt'>updateOrderConf</td>
<td rowspan=5 class=xl70 width=135 style='border-bottom:1.0pt;
border-top:none;width:101pt'>create delete get specified namespace's kv config from NameServer, have not enabled at present</td>
<td class=xl65 width=149 style='width:112pt'>-h</td>
<td class=xl66 width=159 style='width:119pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl65 width=149 style='height:43.0pt;width:112pt'>-n</td>
<td class=xl66 width=159 style='width:119pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl65 width=149 style='height:17.0pt;width:112pt'>-t</td>
<td class=xl66 width=159 style='width:119pt'>topic, key</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl65 width=149 style='height:29.0pt;width:112pt'>-v</td>
<td class=xl66 width=159 style='width:119pt'>orderConf, value</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl65 width=149 style='height:43.0pt;width:112pt'>-m</td>
<td class=xl66 width=159 style='width:119pt'>method, including get, put, delete</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td rowspan=4 height=198 class=xl68 width=163 style='border-bottom:1.0pt;
height:140pt;border-top:none;width:122pt'>allocateMQ</td>
<td rowspan=4 class=xl70 width=135 style='border-bottom:1.0pt;
border-top:none;width:101pt'>calculate consumer list rebalance result by average rebalance algorithm</td>
<td class=xl65 width=149 style='width:112pt'>-t</td>
<td class=xl66 width=159 style='width:119pt'>topic name</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl65 width=149 style='height:17.0pt;width:112pt'>-h</td>
<td class=xl66 width=159 style='width:119pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl65 width=149 style='height:43.0pt;width:112pt'>-n</td>
<td class=xl66 width=159 style='width:119pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=95 style='height:71.0pt'>
<td height=95 class=xl65 width=149 style='height:71.0pt;width:112pt'>-i</td>
<td class=xl66 width=159 style='width:119pt'>ipList, seperate by comma, calculate which topic queue that ips will load.</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td rowspan=4 height=142 class=xl68 width=163 style='border-bottom:1.0pt solid black;
height:106.0pt;border-top:1.0pt;width:122pt'>statsAll</td>
<td rowspan=4 class=xl70 width=135 style='border-bottom:1.0pt;
border-top:none;width:101pt'>print Topic's subscribe info, TPS, size of message blocked, count of read and write at last 24h, eg.</td>
<td class=xl65 width=149 style='width:112pt'>-h</td>
<td class=xl66 width=159 style='width:119pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl65 width=149 style='height:43.0pt;width:112pt'>-n</td>
<td class=xl66 width=159 style='width:119pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl65 width=149 style='height:29.0pt;width:112pt'>-a</td>
<td class=xl66 width=159 style='width:119pt'>only print active topic or not</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl65 width=149 style='height:17.0pt;width:112pt'>-t</td>
<td class=xl66 width=159 style='width:119pt'>assign topic</td>
</tr>
</table>
#### 2.2 Cluster
<table border=0 cellpadding=0 cellspacing=0 width=714>
<col width=177>
<col width=175>
<col width=177>
<col width=185>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl63 width=177 style='height:17.0pt;width:133pt'>名称</td>
<td class=xl64 width=175 style='width:131pt'>meaning</td>
<td class=xl64 width=177 style='width:133pt'>command items</td>
<td class=xl64 width=185 style='width:139pt'>explaination</td>
</tr>
<tr height=207 style='height:155.0pt'>
<td rowspan=4 height=326 class=xl67 width=177 style='border-bottom:1.0pt;
height:244.0pt;border-top:none;width:133pt'><span
style='mso-spacerun:yes'> </span>clusterList</td>
<td rowspan=4 class=xl70 width=175 style='border-bottom:1.0pt;
border-top:none;width:131pt'>query cluster info, including cluster, BrokerName, BrokerId, TPS, eg.</td>
<td class=xl65 width=177 style='width:133pt'>-m</td>
<td class=xl66 width=185 style='width:139pt'>print more infos(eg: #InTotalYest, #OutTotalYest, #InTotalToday ,#OutTotalToday)</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl65 width=177 style='height:17.0pt;width:133pt'>-h</td>
<td class=xl66 width=185 style='width:139pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl65 width=177 style='height:43.0pt;width:133pt'>-n</td>
<td class=xl66 width=185 style='width:139pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl65 width=177 style='height:29.0pt;width:133pt'>-i</td>
<td class=xl66 width=185 style='width:139pt'>print interval, unit second</td>
</tr>
<tr height=95 style='height:71.0pt'>
<td rowspan=8 height=391 class=xl67 width=177 style='border-bottom:1.0pt;
height:292.0pt;border-top:none;width:133pt'>clusterRT</td>
<td rowspan=8 class=xl70 width=175 style='border-bottom:1.0pt;
border-top:none;width:131pt'>send message to detect each cluster's Broker RT. Message will be sent to ${BrokerName} Topic。</td>
<td class=xl65 width=177 style='width:133pt'>-a</td>
<td class=xl66 width=185 style='width:139pt'>amount, count of detection, RT = sum time /
amount</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl65 width=177 style='height:29.0pt;width:133pt'>-s</td>
<td class=xl66 width=185 style='width:139pt'>size of message, unit B</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl65 width=177 style='height:17.0pt;width:133pt'>-c</td>
<td class=xl66 width=185 style='width:139pt'>which cluster will be detected</td>
</tr>
<tr height=76 style='height:57.0pt'>
<td height=76 class=xl65 width=177 style='height:57.0pt;width:133pt'>-p</td>
<td class=xl66 width=185 style='width:139pt'>whether print format log, splitted by |, default is not print</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl65 width=177 style='height:17.0pt;width:133pt'>-h</td>
<td class=xl66 width=185 style='width:139pt'>print help info</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl65 width=177 style='height:29.0pt;width:133pt'>-m</td>
<td class=xl66 width=185 style='width:139pt'>which machine room it belongs to, just for print</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl65 width=177 style='height:29.0pt;width:133pt'>-i</td>
<td class=xl66 width=185 style='width:139pt'>send interval, unit second</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl65 width=177 style='height:43.0pt;width:133pt'>-n</td>
<td class=xl66 width=185 style='width:139pt'>NameServer Service address, format is ip:port</td>
</tr>
</table>
#### 2.3 Broker
<table border=0 cellpadding=0 cellspacing=0 width=714>
<col width=177>
<col width=175>
<col width=177>
<col width=185>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl63 width=177 style='height:17.0pt;width:133pt'>名称</td>
<td class=xl64 width=175 style='width:131pt'>meaning</td>
<td class=xl64 width=177 style='width:133pt'>command items</td>
<td class=xl64 width=185 style='width:139pt'>explaination</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td rowspan=6 height=206 class=xl69 width=191 style='border-bottom:1.0pt;
height:154.0pt;border-top:none;width:143pt'>updateBrokerConfig</td>
<td rowspan=6 class=xl72 width=87 style='border-bottom:1.0pt;
border-top:none;width:65pt'>update Broker's config file, it will modify Broker.conf</td>
<td class=xl67 width=87 style='width:65pt'>-b</td>
<td class=xl68 width=87 style='width:65pt'>Broker address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-c</td>
<td class=xl68 width=87 style='width:65pt'>cluster name</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-k</td>
<td class=xl68 width=87 style='width:65pt'>key</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-v</td>
<td class=xl68 width=87 style='width:65pt'>value</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td rowspan=3 height=137 class=xl69 width=191 style='border-bottom:1.0pt;
height:103.0pt;border-top:none;width:143pt'>brokerStatus</td>
<td rowspan=3 class=xl72 width=87 style='border-bottom:1.0pt;
border-top:none;width:65pt'>get Broker's statistics info, running status(including whatever you want).</td>
<td class=xl67 width=87 style='width:65pt'>-b</td>
<td class=xl68 width=87 style='width:65pt'>Broker address, fomat isip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td rowspan=6 height=256 class=xl69 width=191 style='border-bottom:1.0pt;
height:192.0pt;border-top:none;width:143pt'>brokerConsumeStats</td>
<td rowspan=6 class=xl72 width=87 style='border-bottom:1.0pt;
border-top:none;width:65pt'>Broker's consumer info, including Consume Offset, Broker Offset, Diff, Timestamp that ordered by essage Queue</td>
<td class=xl67 width=87 style='width:65pt'>-b</td>
<td class=xl68 width=87 style='width:65pt'>Broker address, fomat isip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-t</td>
<td class=xl68 width=87 style='width:65pt'>request timeout time</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-l</td>
<td class=xl68 width=87 style='width:65pt'>diff threshold, it will print when exceed this threshold.</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-o</td>
<td class=xl68 width=87 style='width:65pt'>whether is sequencial topic, generally false</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td rowspan=2 height=114 class=xl69 width=191 style='border-bottom:1.0pt;
height:86.0pt;border-top:none;width:143pt'>getBrokerConfig</td>
<td rowspan=2 class=xl72 width=87 style='border-bottom:1.0pt
border-top:none;width:65pt'>get Broker's config</td>
<td class=xl67 width=87 style='width:65pt'>-b</td>
<td class=xl68 width=87 style='width:65pt'>Broker address, fomat isip:port</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td rowspan=3 height=137 class=xl69 width=191 style='border-bottom:1.0pt;
height:103.0pt;border-top:none;width:143pt'>wipeWritePerm</td>
<td rowspan=3 class=xl72 width=87 style='border-bottom:1.0pt
border-top:none;width:65pt'>revoke broker's write authority from NameServer.</td>
<td class=xl67 width=87 style='width:65pt'>-b</td>
<td class=xl68 width=87 style='width:65pt'>Broker address, fomat isip:port</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td rowspan=4 height=160 class=xl69 width=191 style='border-bottom:1.0pt;
height:120.0pt;border-top:none;width:143pt'>cleanExpiredCQ</td>
<td rowspan=4 class=xl72 width=87 style='border-bottom:1.0pt
border-top:none;width:65pt'>clean Broker's expired Consume Queue that maybe generated by decrease queue count.</td>
<td class=xl67 width=87 style='width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-b</td>
<td class=xl68 width=87 style='width:65pt'>Broker address, fomat isip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-c</td>
<td class=xl68 width=87 style='width:65pt'>cluster name</td>
</tr>
<tr height=88 style='mso-height-source:userset;height:66.0pt'>
<td rowspan=4 height=191 class=xl69 width=191 style='border-bottom:1.0pt;
height:143.0pt;border-top:none;width:143pt'>cleanUnusedTopic</td>
<td rowspan=4 class=xl72 width=87 style='border-bottom:1.0pt
border-top:none;width:65pt'>clean Broker's unused Topic that deleted mannually to release memory that Topic's Consume Queue occupied.</td>
<td class=xl67 width=87 style='width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-b</td>
<td class=xl68 width=87 style='width:65pt'>Broker address, fomat isip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-c</td>
<td class=xl68 width=87 style='width:65pt'>cluster name</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td rowspan=5 height=199 class=xl69 width=191 style='border-bottom:1.0pt;
height:149.0pt;border-top:none;width:143pt'>sendMsgStatus</td>
<td rowspan=5 class=xl72 width=87 style='border-bottom:1.0pt
border-top:none;width:65pt'>send message to Broker, return send status and RT</td>
<td class=xl67 width=87 style='width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-b</td>
<td class=xl68 width=87 style='width:65pt'>BrokerName, is different from broker address</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-s</td>
<td class=xl68 width=87 style='width:65pt'>message size, unit B</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-c</td>
<td class=xl68 width=87 style='width:65pt'>send count</td>
</tr>
</table>
#### 2.4 Message
<table border=0 cellpadding=0 cellspacing=0 width=714>
<col width=177>
<col width=175>
<col width=177>
<col width=185>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl63 width=177 style='height:17.0pt;width:133pt'>名称</td>
<td class=xl64 width=175 style='width:131pt'>meaning</td>
<td class=xl64 width=177 style='width:133pt'>command items</td>
<td class=xl64 width=185 style='width:139pt'>explaination</td>
</tr>
<tr height=128 style='height:96.0pt'>
<td rowspan=3 height=208 class=xl69 width=87 style='border-bottom:1.0pt;
height:156.0pt;border-top:none;width:65pt'>queryMsgById</td>
<td rowspan=3 class=xl72 width=87 style='border-bottom:1.0pt;
border-top:none;width:65pt'>query message by offsetMsgId. If use opensource console, it should use offsetMsgId. Please refer to QueryMsgByIdSubCommand for detail.</td>
<td class=xl67 width=87 style='width:65pt'>-i</td>
<td class=xl67 width=87 style='width:65pt'>msgId</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td rowspan=4 height=126 class=xl69 width=87 style='border-bottom:1.0pt;
height:94.0pt;border-top:none;width:65pt'>queryMsgByKey</td>
<td rowspan=4 class=xl72 width=87 style='border-bottom:1.0pt;
border-top:none;width:65pt'>query message by Message's Key</td>
<td class=xl67 width=87 style='width:65pt'>-k</td>
<td class=xl67 width=87 style='width:65pt'>msgKey</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-t</td>
<td class=xl68 width=87 style='width:65pt'>topic name</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=225 style='height:169.0pt'>
<td rowspan=6 height=390 class=xl69 width=87 style='border-bottom:1.0pt;
height:292.0pt;border-top:none;width:65pt'>queryMsgByOffset</td>
<td rowspan=6 class=xl72 width=87 style='border-bottom:1.0pt;
border-top:none;width:65pt'>query message by Offset</td>
<td class=xl67 width=87 style='width:65pt'>-b</td>
<td class=xl68 width=87 style='width:65pt'>Broker name(it's not broker address, can query Broker name by clusterList).</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-i</td>
<td class=xl68 width=87 style='width:65pt'>query queue id</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-o</td>
<td class=xl68 width=87 style='width:65pt'>offset value</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-t</td>
<td class=xl68 width=87 style='width:65pt'>topic name</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=47>
<td rowspan=6 height=209 class=xl69 width=87 style='border-bottom:1.0pt;
height:156.0pt;border-top:none;width:65pt'>queryMsgByUniqueKey</td>
<td rowspan=6 class=xl72 width=87 style='border-bottom:1.0pt;
border-top:none;width:65pt'>query by msgId, msgId is different from offsetMsgId, please refer to Frequently asked questions about operations for details. Use -g and -d to let specified consumer return consume result.</td>
<td class=xl67 width=87 style='width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-i</td>
<td class=xl67 width=87 style='width:65pt'>uniqe msg id</td>
</tr>
<tr height=36 style='height:27.0pt'>
<td height=36 class=xl67 width=87 style='height:27.0pt;width:65pt'>-g</td>
<td class=xl67 width=87 style='width:65pt'>consumerGroup</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-d</td>
<td class=xl67 width=87 style='width:65pt'>clientId</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-t</td>
<td class=xl68 width=87 style='width:65pt'>topic name</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td rowspan=5 height=149 class=xl69 width=87 style='border-bottom:1.0pt
height:111.0pt;border-top:none;width:65pt'>checkMsgSendRT</td>
<td rowspan=5 class=xl72 width=87 style='border-bottom:1.0pt;
border-top:none;width:65pt'>detect RT of sending a message to a topic, similiar to clusterRT</td>
<td class=xl67 width=87 style='width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-t</td>
<td class=xl68 width=87 style='width:65pt'>topic name</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-a</td>
<td class=xl68 width=87 style='width:65pt'>detection count</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-s</td>
<td class=xl68 width=87 style='width:65pt'>size of the message</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td rowspan=8 height=218 class=xl69 width=87 style='border-bottom:1.0pt;
height:162.0pt;border-top:none;width:65pt'>sendMessage</td>
<td rowspan=8 class=xl72 width=87 style='border-bottom:1.0pt;
border-top:none;width:65pt'>send a message, also can send to a specified Message Queue.</td>
<td class=xl67 width=87 style='width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-t</td>
<td class=xl68 width=87 style='width:65pt'>topic name</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-p</td>
<td class=xl68 width=87 style='width:65pt'>body, message entity</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-k</td>
<td class=xl67 width=87 style='width:65pt'>keys</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-c</td>
<td class=xl67 width=87 style='width:65pt'>tags</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-b</td>
<td class=xl67 width=87 style='width:65pt'>BrokerName</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-i</td>
<td class=xl67 width=87 style='width:65pt'>queueId</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td rowspan=10 height=312 class=xl69 width=87 style='border-bottom:1.0pt;
height:232.0pt;border-top:none;width:65pt'>consumeMessage</td>
<td rowspan=10 class=xl72 width=87 style='border-bottom:1.0pt;
border-top:none;width:65pt'>consume message. Differert consume logic depends on offset, start & end timestamp, message queue, please refer to ConsumeMessageCommand for details.</td>
<td class=xl67 width=87 style='width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-t</td>
<td class=xl68 width=87 style='width:65pt'>topic name</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-b</td>
<td class=xl67 width=87 style='width:65pt'>BrokerName</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-o</td>
<td class=xl68 width=87 style='width:65pt'>offset that consumer start consume</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-i</td>
<td class=xl67 width=87 style='width:65pt'>queueId</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-g</td>
<td class=xl68 width=87 style='width:65pt'>consumer gropu</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-s</td>
<td class=xl68 width=87 style='width:65pt'>timestamp at start, refer to -h to get format开</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-d</td>
<td class=xl68 width=87 style='width:65pt'>timestamp at the end</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-c</td>
<td class=xl68 width=87 style='width:65pt'>size of message that consumed</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td rowspan=8 height=282 class=xl69 width=87 style='border-bottom:1.0pt;
height:210.0pt;border-top:none;width:65pt'>printMsg</td>
<td rowspan=8 class=xl72 width=87 style='border-bottom:1.0pt;
border-top:none;width:65pt'>consume and print messages from broker, support a time range</td>
<td class=xl67 width=87 style='width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-t</td>
<td class=xl68 width=87 style='width:65pt'>topic name</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-c</td>
<td class=xl68 width=87 style='width:65pt'>charset, eg: UTF-8</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-s</td>
<td class=xl68 width=87 style='width:65pt'>subExpress, filter expression</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-b</td>
<td class=xl68 width=87 style='width:65pt'>timestap at start, refer to -h to get format</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-e</td>
<td class=xl68 width=87 style='width:65pt'>timestamp at the end</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-d</td>
<td class=xl68 width=87 style='width:65pt'>whether print message entity or not</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td rowspan=12 height=390 class=xl69 width=87 style='border-bottom:1.0pt;
height:290.0pt;border-top:none;width:65pt'>printMsgByQueue</td>
<td rowspan=12 class=xl72 width=87 style='border-bottom:1.0pt;
border-top:none;width:65pt'>similar to printMsg, but it need specified Message Queue</td>
<td class=xl67 width=87 style='width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-t</td>
<td class=xl68 width=87 style='width:65pt'>topic name</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-i</td>
<td class=xl67 width=87 style='width:65pt'>queueId</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-a</td>
<td class=xl67 width=87 style='width:65pt'>BrokerName</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-c</td>
<td class=xl68 width=87 style='width:65pt'>charset, eg: UTF-8</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-s</td>
<td class=xl68 width=87 style='width:65pt'>subExpress, filter expression</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-b</td>
<td class=xl68 width=87 style='width:65pt'>timestamp at start, refer to -h to get format</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-e</td>
<td class=xl68 width=87 style='width:65pt'>timestamp at the end</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-p</td>
<td class=xl68 width=87 style='width:65pt'>whether print message or not</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-d</td>
<td class=xl68 width=87 style='width:65pt'>whether print message entity or not</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-f</td>
<td class=xl68 width=87 style='width:65pt'>whether count and print tag or not</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td rowspan=7 height=410 class=xl69 width=87 style='border-bottom:1.0pt;
height:307.0pt;border-top:none;width:65pt'>resetOffsetByTime</td>
<td rowspan=7 class=xl72 width=87 style='border-bottom:1.0pt;
border-top:none;width:65pt'>reset offset by timestamp, Broker and consumer will all be reseted</td>
<td class=xl67 width=87 style='width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-g</td>
<td class=xl68 width=87 style='width:65pt'>consumer group</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-t</td>
<td class=xl68 width=87 style='width:65pt'>topic name</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-s</td>
<td class=xl68 width=87 style='width:65pt'>reset offset corresponding to this timestamp</td>
</tr>
<tr height=188 style='height:141.0pt'>
<td height=188 class=xl67 width=87 style='height:141.0pt;width:65pt'>-f</td>
<td class=xl68 width=87 style='width:65pt'>whether enforce to reset or not, if set false, only can reset offset, if set true, it omit the relationship between timestamp and consumer offset.</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-c</td>
<td class=xl68 width=87 style='width:65pt'>whether reset c++ sdk's offset or not</td>
</tr>
</table>
#### 2.5 Consumer, Consumer Group
<table border=0 cellpadding=0 cellspacing=0 width=714>
<col width=177>
<col width=175>
<col width=177>
<col width=185>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl63 width=177 style='height:17.0pt;width:133pt'>name</td>
<td class=xl64 width=175 style='width:131pt'>meaning</td>
<td class=xl64 width=177 style='width:133pt'>command items</td>
<td class=xl64 width=185 style='width:139pt'>explaination</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td rowspan=4 height=158 class=xl69 width=87 style='border-bottom:1.0pt;
height:110pt;border-top:none;width:65pt'>consumerProgress</td>
<td rowspan=4 class=xl72 width=87 style='border-bottom:1.0pt;
border-top:none;width:65pt'>query subscribe status, can get blocking counts of a concrete client ip.</td>
<td class=xl67 width=87 style='width:65pt'>-g</td>
<td class=xl68 width=87 style='width:65pt'>consumer group name</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-s</td>
<td class=xl68 width=87 style='width:65pt'>whether print client IP or not</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=105 style='mso-height-source:userset;height:79.0pt'>
<td rowspan=5 height=260 class=xl69 width=87 style='border-bottom:1.0pt;
height:195.0pt;border-top:none;width:65pt'>consumerStatus</td>
<td rowspan=5 class=xl72 width=87 style='border-bottom:1.0pt
border-top:none;width:65pt'>query consumer status, including message blocking, and consumer's jstack result(please refer to ConsumerStatusSubCommand)</td>
<td class=xl67 width=87 style='width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=36 style='height:27.0pt'>
<td height=36 class=xl67 width=87 style='height:27.0pt;width:65pt'>-g</td>
<td class=xl67 width=87 style='width:65pt'>consumer group</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-i</td>
<td class=xl67 width=87 style='width:65pt'>clientId</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-s</td>
<td class=xl68 width=87 style='width:65pt'>whether execute jstack or not</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td rowspan=13 height=761 class=xl69 width=87 style='border-bottom:1.0pt
height:569.0pt;border-top:none;width:65pt'>updateSubGroup</td>
<td rowspan=13 class=xl72 width=87 style='border-bottom:1.0pt
border-top:none;width:65pt'>create or update subscribe info</td>
<td class=xl67 width=87 style='width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-b</td>
<td class=xl68 width=87 style='width:65pt'>Broker address</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-c</td>
<td class=xl68 width=87 style='width:65pt'>cluster name</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-g</td>
<td class=xl68 width=87 style='width:65pt'>consumer group name</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-s</td>
<td class=xl68 width=87 style='width:65pt'>consumer group is allowed to consume or not</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-m</td>
<td class=xl68 width=87 style='width:65pt'>start consume from minimal offset or not</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-d</td>
<td class=xl68 width=87 style='width:65pt'>broadcast mode or not</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-q</td>
<td class=xl68 width=87 style='width:65pt'>capacity of retry queue</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-r</td>
<td class=xl68 width=87 style='width:65pt'>max retry count</td>
</tr>
<tr height=207 style='height:155.0pt'>
<td height=207 class=xl67 width=87 style='height:155.0pt;width:65pt'>-i</td>
<td class=xl68 width=87 style='width:65pt'>It works when slaveReadEnable enabled, and that not consumed from slave. Suggesting that consume from slave node by specify slave id.</td>
</tr>
<tr height=132 style='height:99.0pt'>
<td height=132 class=xl67 width=87 style='height:99.0pt;width:65pt'>-w</td>
<td class=xl68 width=87 style='width:65pt'>If broker consume from slave, whic slave node depends on this config that configed by BrokerId, eg: 1.</td>
</tr>
<tr height=76 style='height:57.0pt'>
<td height=76 class=xl67 width=87 style='height:57.0pt;width:65pt'>-a</td>
<td class=xl68 width=87 style='width:65pt'>whether notify other consumers to rebalance or not when the count of consumer changes</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td rowspan=5 height=165 class=xl69 width=87 style='border-bottom:1.0pt
height:123.0pt;border-top:none;width:65pt'>deleteSubGroup</td>
<td rowspan=5 class=xl72 width=87 style='border-bottom:1.0pt
border-top:none;width:65pt'>delete subscribe info from Broker</td>
<td class=xl67 width=87 style='width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-b</td>
<td class=xl68 width=87 style='width:65pt'>Broker address</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-c</td>
<td class=xl68 width=87 style='width:65pt'>cluster name</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td height=39 class=xl67 width=87 style='height:29.0pt;width:65pt'>-g</td>
<td class=xl68 width=87 style='width:65pt'>consumer group name</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td rowspan=6 height=172 class=xl69 width=87 style='border-bottom:1.0pt
height:120pt;border-top:none;width:65pt'>cloneGroupOffset</td>
<td rowspan=6 class=xl72 width=87 style='border-bottom:1.0pt
border-top:none;width:65pt'>use source group's offset at target group</td>
<td class=xl67 width=87 style='width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-s</td>
<td class=xl68 width=87 style='width:65pt'>source consumer group</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-d</td>
<td class=xl68 width=87 style='width:65pt'>target consumer group</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-t</td>
<td class=xl68 width=87 style='width:65pt'>topic name</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-o</td>
<td class=xl68 width=87 style='width:65pt'>not used at present</td>
</tr>
</table>
#### 2.6 Connection
<table border=0 cellpadding=0 cellspacing=0 width=714>
<col width=177>
<col width=175>
<col width=177>
<col width=185>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl63 width=177 style='height:17.0pt;width:133pt'>name</td>
<td class=xl64 width=175 style='width:131pt'>meaning</td>
<td class=xl64 width=177 style='width:133pt'>command items</td>
<td class=xl64 width=185 style='width:139pt'>explaination</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td rowspan=3 height=119 class=xl69 width=87 style='border-bottom:1.0pt
height:89.0pt;border-top:none;width:65pt'>consumerConnec tion</td>
<td rowspan=3 class=xl72 width=87 style='border-bottom:1.0pt
border-top:none;width:65pt'>query Consumer's connection</td>
<td class=xl67 width=87 style='width:65pt'>-g</td>
<td class=xl68 width=87 style='width:65pt'>consumer group name</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=39 style='height:29.0pt'>
<td rowspan=4 height=142 class=xl69 width=87 style='border-bottom:1.0pt
height:106.0pt;border-top:none;width:65pt'>producerConnec tion</td>
<td rowspan=4 class=xl72 width=87 style='border-bottom:1.0pt
border-top:none;width:65pt'>query Producer's connection</td>
<td class=xl67 width=87 style='width:65pt'>-g</td>
<td class=xl68 width=87 style='width:65pt'>producer group name</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-t</td>
<td class=xl68 width=87 style='width:65pt'>topic name</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
</table>
#### 2.7 NameServer
<table border=0 cellpadding=0 cellspacing=0 width=714>
<col width=177>
<col width=175>
<col width=177>
<col width=185>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl63 width=177 style='height:17.0pt;width:133pt'>name</td>
<td class=xl64 width=175 style='width:131pt'>meaning</td>
<td class=xl64 width=177 style='width:133pt'>command items</td>
<td class=xl64 width=185 style='width:139pt'>explaination</td>
</tr>
<tr height=21 style='height:16.0pt'>
<td rowspan=5 height=143 class=xl69 width=87 style='border-bottom:1.0pt
height:100pt;border-top:none;width:65pt'>updateKvConfig</td>
<td rowspan=5 class=xl72 width=87 style='border-bottom:1.0pt
border-top:none;width:65pt'>update NameServer's kv config, not used at present</td>
<td class=xl75 width=87 style='width:65pt'>-s</td>
<td class=xl76 width=87 style='width:65pt'>namespace</td>
</tr>
<tr height=21 style='height:16.0pt'>
<td height=21 class=xl75 width=87 style='height:16.0pt;width:65pt'>-k</td>
<td class=xl75 width=87 style='width:65pt'>key</td>
</tr>
<tr height=21 style='height:16.0pt'>
<td height=21 class=xl75 width=87 style='height:16.0pt;width:65pt'>-v</td>
<td class=xl75 width=87 style='width:65pt'>value</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td rowspan=4 height=126 class=xl69 width=87 style='border-bottom:1.0pt
height:94.0pt;border-top:none;width:65pt'>deleteKvConfig</td>
<td rowspan=4 class=xl72 width=87 style='border-bottom:1.0pt
border-top:none;width:65pt'>delete NameServer's kv config</td>
<td class=xl67 width=87 style='width:65pt'>-s</td>
<td class=xl68 width=87 style='width:65pt'>namespace</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-k</td>
<td class=xl67 width=87 style='width:65pt'>key</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td height=57 class=xl67 width=87 style='height:43.0pt;width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td rowspan=2 height=80 class=xl69 width=87 style='border-bottom:1.0pt
height:60.0pt;border-top:none;width:65pt'>getNamesrvConfig</td>
<td rowspan=2 class=xl72 width=87 style='border-bottom:1.0pt
border-top:none;width:65pt'>get NameServer's config</td>
<td class=xl67 width=87 style='width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td rowspan=4 height=126 class=xl69 width=87 style='border-bottom:1.0pt
height:94.0pt;border-top:none;width:65pt'>updateNamesrvConfig</td>
<td rowspan=4 class=xl72 width=87 style='border-bottom:1.0pt
border-top:none;width:65pt'>modify NameServer's config</td>
<td class=xl67 width=87 style='width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-k</td>
<td class=xl67 width=87 style='width:65pt'>key</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-v</td>
<td class=xl67 width=87 style='width:65pt'>value</td>
</tr>
</table>
#### 2.8 Other
<table border=0 cellpadding=0 cellspacing=0 width=714>
<col width=177>
<col width=175>
<col width=177>
<col width=185>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl63 width=177 style='height:17.0pt;width:133pt'>name</td>
<td class=xl64 width=175 style='width:131pt'>meaning</td>
<td class=xl64 width=177 style='width:133pt'>command items</td>
<td class=xl64 width=185 style='width:139pt'>explaination</td>
</tr>
<tr height=57 style='height:43.0pt'>
<td rowspan=2 height=80 class=xl69 width=87 style='border-bottom:1.0pt
height:60.0pt;border-top:none;width:65pt'>startMonitoring</td>
<td rowspan=2 class=xl71 width=87 style='border-bottom:1.0pt
border-top:none;width:65pt'>Start the monitoring process, monitor message deletion and the number of retried messages in the queue</td>
<td class=xl67 width=87 style='width:65pt'>-n</td>
<td class=xl68 width=87 style='width:65pt'>NameServer Service address, format is ip:port</td>
</tr>
<tr height=23 style='height:17.0pt'>
<td height=23 class=xl67 width=87 style='height:17.0pt;width:65pt'>-h</td>
<td class=xl68 width=87 style='width:65pt'>print help info</td>
</tr>
</table>
### 3 Frequently asked questions about operations
#### 3.1 RocketMQ's mqadmin command error
> question description：execute mqadmin occur below exception after deploy RocketMQ cluster.
>
> ```java
> org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to <null> failed
> ```
Solution: execute command `export NAMESRV_ADDR=ip:9876` (ip is NameServer's ip address), then execute mqadmin commands.
#### 3.2 RocketMQ consumer cannot consume, because of different version of producer and consumer.
> question description: one producer produce message, consumer A can consume, consume B cannot consume, RocketMQ console print:
>
> ```java
> Not found the consumer group consume stats, because return offset table is empty, maybe the consumer not consume any message。
> ```
Solution: make sure that producer and consumer has the same version of rocketmq-client.
#### 3.3 Consumer cannot consume oldest message, when a new consumer group is added.
> question description: when a new consumer group start, it consumes from current offset, do not fetch oldest message.
Solution: rocketmq's default policy is consume from latest, that is skip oldest message. If you want consume oldest message, you need to set `org.apache.rocketmq.client.consumer.DefaultMQPushConsumer#setConsumeFromWhere`. The following is three common configurations:
- default configuration, a new consumer group consume from latest position at first startup, then consume from last time's offset at next startup, that is skip oldest message;
```java
consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_LAST_OFFSET);
```
- a new consumer group consume from oldest postion at first startup, then consume from last time's offset at next startup, that is consume the unexpired message;
```java
consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
```
- a new consumer group consume from specified timestamp at first startup, then consume from last time's offset at next startup, cooperate with consumer.setConsumeTimestamp(), default is half an hour before;
```java
consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_TIMESTAMP);
```
#### 3.4 How to enable consume from Slave
In some cases, consumer need reset offset to a day or two before, if Master Broker has limited memory, it's CommitLog will have a high IO load, then it will impact other message's read and write that on this broker. When `slaveReadEnable=true` is set, and consumer's offset exceeds `accessMessageInMemoryMaxRatio=40%`, Master Broker will recommend consumer consume from Slave Broker to lower Master Broker IO.
#### 3.5 Performance tuning
A spin lock is recommended for asynchronous disk flush, a reentrant lock is recommended for synchronous disk flush, configuration item is `useReentrantLockWhenPutMessage`, default is false; Enable `TransientStorePoolEnable` is recommended when use asynchronous disk flush; Recommend to close `transferMsgByHeap` to improve fetch efficiency; Set a little larger `sendMessageThreadPoolNums`, when use synchronous disk flush.
#### 3.6 The meaning and difference between msgId and offsetMsgId in RocketMQ
You will usually see the following log print message after sending message by using RocketMQ sdk.
```java
SendResult [sendStatus=SEND_OK, msgId=0A42333A0DC818B4AAC246C290FD0000, offsetMsgId=0A42333A00002A9F000000000134F1F5, messageQueue=MessageQueue [topic=topicTest1, BrokerName=mac.local, queueId=3], queueOffset=4]
```
- msgId, is generated by producer sdk. In particular, call method `MessageClientIDSetter.createUniqIDBuffer()` to generate unique Id;
- offsetMsgId, offsetMsgId is generated by Broker server(format is "Ip Address + port + CommitLog offset"). offsetMsgId is messageId that is RocketMQ console's input.