spark connect to kafka

There are several reasons for this problem:1, the client installation of the machine is generally a virtual machine, the name of the virtual machine may be casual, however, Yarn-client mode submission task, is the default to the machine as a driver. As a result, other machines cannot access the machine directly through the name of host. The error is failed to connect to driver at x.x.x.x,retrying ....Workaround: Add a--conf spark.driver.host= $your _i

= password (' Your_password '); Question 3: when I want to let my Blogservice remote connection database, how to fail, I also open the permissions, also set up a firewall. So I found a computer in the LAN with MySQL to try to connect themselves, found that the error number 111 Originally, MySQL in the configuration file also has a layer of settings, so that only localhost connection. Try to find the configuration file (each version may be different,