ActiveMQ -- persistent mechanism

Persistence mechanism

differ DeliveryMode.PERSISTENT

Previous persistent , Business , Sign for yes mq A mechanism of its own

It's understandable , The previous three mechanisms ensure the reliability of messages in the sending process , and Persistence mechanism Is a more reliable guarantee of data . Physical backup message data .MQ The server should not be the same as the data backup server .

After the sender sends the message , The message center will store messages to local data problems 、 In memory database or remote database , Then try to send the message to the receiver again , If successful, delete the stored message , If it fails, continue to try to send .

activemq Supported message persistence mechanism ：JDBC,AMQ,KahaDB,LevelDB

http://activemq.apache.org/persistence

Activemq 5.17.0 The version began to be discarded LevelDB, So it is recommended to use KahaDB.