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Tom Lane 741d7f1047 Use annotations to reduce instability of isolation-test results. ... We've long contended with isolation test results that aren't entirely stable. Some test scripts insert long delays to try to force stable results, which is not terribly desirable; but other erratic failure modes remain, causing unrepeatable buildfarm failures. I've spent a fair amount of time trying to solve this by improving the server-side support code, without much success: that way is fundamentally unable to cope with diffs that stem from chance ordering of arrival of messages from different server processes. We can improve matters on the client side, however, by annotating the test scripts themselves to show the desired reporting order of events that might occur in different orders. This patch adds three types of annotations to deal with (a) test steps that might or might not complete their waits before the isolationtester can see them waiting; (b) test steps in different sessions that can legitimately complete in either order; and (c) NOTIFY messages that might arrive before or after the completion of a step in another session. We might need more annotation types later, but this seems to be enough to deal with the instabilities we've seen in the buildfarm. It also lets us get rid of all the long delays that were previously used, cutting more than a minute off the runtime of the isolation tests. Back-patch to all supported branches, because the buildfarm instabilities affect all the branches, and because it seems desirable to keep isolationtester's capabilities the same across all branches to simplify possible future back-patching of tests. Discussion: https://postgr.es/m/327948.1623725828@sss.pgh.pa.us		4 years ago
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expected	Use annotations to reduce instability of isolation-test results.	4 years ago
specs	Add option to enable two_phase commits via pg_create_logical_replication_slot.	5 years ago
sql	Fix assertion during streaming of multi-insert toast changes.	4 years ago
t	Add a copyright notice to perl files lacking one.	4 years ago
.gitignore	…
Makefile	Add information of total data processed to replication slot stats.	4 years ago
logical.conf	Add logical_decoding_work_mem to limit ReorderBuffer memory usage.	6 years ago
test_decoding.c	Add a xid argument to the filter_prepare callback for output plugins.	5 years ago