Caching SHA-2 (or 256) Pluggable Authentication for MySQL 8

If you are like me and you spend chilly spring evenings relaxing by the fire, reading the manual for the upcoming MySQL 8 release, you may have seen Caching SHA-2 Pluggable Authentication in section 6.5.1.3. 

There are now TWO SHA-256 plugsins for MySQL 8 for hashing user account passwords and no, I do not know what the title of the manual pages says SHA-2 when it is SHA-256.  We have sha256_password for basic SHA-256 authentication and  caching_sha2_password that adds caching for better performance.

The default plugin is caching_sha2_password has three features not found in its non caching brother. The first is, predictably, a cache for faster authentication for repeat customers to the database. Next is a RSA-based password exchange that is independent of the SSL library you executable is linked. And it supports Unix socket-files and shared-memory protocols -- so sorry named pipe fans.

If you have been testing the release candidate and use older clients or older libmysqlclient you may have seen Authentication plugin 'caching_sha2_password' is not supported or some other similar message. You need updated clients to work with the updated server.  Old clients used the old MySQL native password password not the new chaching_ha2_password as the default.

When upgrading from 5,7,21 to the 8 GA version, existing accounts are not upgraded,  But if you are starting with a fresh install you get the chaching_sha2_password in your mysql.user entry.   I am sure this will catch someone so please take care. And this goes for new replication servers too! 

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