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Commit 93f414614 improved a pre-existing test case so that it would show whether or not termination of the "remote" worker process happened. This soon exposed that, when debug_invalidate_system_caches_always (nee CLOBBER_CACHE_ALWAYS) is enabled, no such termination occurs. That's because cache invalidation forces postgres_fdw connections to be dropped at end of transaction, so that there's no worker to terminate. There's a race condition as to whether the worker will manage to get out of the BackendStatusArray before we look, but at least on buildfarm member hyrax, it's failed twice in two attempts. Rather than re-lobotomizing the test, let's fix this by transiently disabling debug_invalidate_system_caches_always. (Hooray for that being just a GUC nowadays, rather than a compile-time option.) If this proves not to be enough to make the test stable, we can do the other thing instead. Discussion: https://postgr.es/m/3854538.1620081771@sss.pgh.pa.us
The PostgreSQL contrib tree --------------------------- This subtree contains porting tools, analysis utilities, and plug-in features that are not part of the core PostgreSQL system, mainly because they address a limited audience or are too experimental to be part of the main source tree. This does not preclude their usefulness. User documentation for each module appears in the main SGML documentation. When building from the source distribution, these modules are not built automatically, unless you build the "world" target. You can also build and install them all by running "make all" and "make install" in this directory; or to build and install just one selected module, do the same in that module's subdirectory. Some directories supply new user-defined functions, operators, or types. To make use of one of these modules, after you have installed the code you need to register the new SQL objects in the database system by executing a CREATE EXTENSION command. In a fresh database, you can simply do CREATE EXTENSION module_name; See the PostgreSQL documentation for more information about this procedure.