WL#9581: Deprecate and remove DTrace probes
Affects: Server-8.0 — Status: Complete — Priority: Medium
This work removes the DTrace probes in MySQL. The probes were added in 2008, as a backport from MySQL 6.0. There are a few very basic probes (e.g. number of rows fetched and number of index lookups); there has been little activity nor user requests to add more. DTrace probes have shown to be a steady source of build breaks and other issues that need engineering time, complicates the build system, and works as an impediment to cleanups. In particular, DTrace probes are not compiled through the normal build system but through a special set of scripts, and interact with linking in complicated ways. These interactions are different from platform to platform, multiplying the maintenance cost. We know of no immediate way to give a warning when a DTrace probe is used. Thus, the recommendation would be to just remove them outright with no deprecation period. User Documentation ================== * http://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-18.html * http://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-1.html * http://dev.mysql.com/doc/refman/5.7/en/mysql-nutshell.html * http://dev.mysql.com/doc/refman/8.0/en/mysql-nutshell.html
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