Something wrong when run "bin/SyncProducer" in two or more threads(specified by -T)

[dongbula]

BUG REPORT The running result will be like（both master an release 2.2）:

./SyncProducer -n XX -g XX -t XX -i XX -T 2
nameserver: XX
topic: XX
groupname: XX
produce content: msgbody for test
msg  count: 1
thread count: 2
send failed: Type: MQClientException , msg: No route info of this topic: XX,error:-1,in file </root/rocketmq-client-cpp/src/producer/DefaultMQProducerImpl.cpp> line:434
send failed: Type: MQClientException , msg: No route info of this topic: XX,error:-1,in file </root/rocketmq-client-cpp/src/producer/DefaultMQProducerImpl.cpp> line:434
send failed: Type: MQClientException , msg: No route info of this topic: XX,error:-1,in file </root/rocketmq-client-cpp/src/producer/DefaultMQProducerImpl.cpp> line:434
send failed: Type: MQClientException , msg: No route info of this topic: XX,error:-1,in file </root/rocketmq-client-cpp/src/producer/DefaultMQProducerImpl.cpp> line:434
send failed: Type: MQClientException , msg: No route info of this topic: XX,error:-1,in file </root/rocketmq-client-cpp/src/producer/DefaultMQProducerImpl.cpp> line:434
send failed: Type: MQClientException , msg: No route info of this topic: XX,error:-1,in file </root/rocketmq-client-cpp/src/producer/DefaultMQProducerImpl.cpp> line:434
per msg time: 56ms
========================finished==============================
tps: 3

[zongtanghu]

Hi @ShannonDing @jonnxu @githublaohu @duhenglucky please help to see this issue.

[ifplusor]

link #346