Commit 6b80394781 introduced integer comparison functions designed
to be as efficient as possible while avoiding overflow. This
commit makes use of these functions in many of the in-tree qsort()
comparators to help ensure transitivity. Many of these comparator
functions should also see a small performance boost.
Author: Mats Kindahl
Reviewed-by: Andres Freund, Fabrízio de Royes Mello
Discussion: https://postgr.es/m/CA%2B14426g2Wa9QuUpmakwPxXFWG_1FaY0AsApkvcTBy-YfS6uaw%40mail.gmail.com
Analysis of buildfarm results showed that the code that was intended
to wait for the inserts performed by this test to complete did not
actually do so. Try to make that logic more robust.
Improve error checking elsewhere in the script, too, so that we
don't miss things like poll_query_until failing.
Along the way, fix a bit of pgindent damage introduced by commit
5ddf997347, which aimed to help us
debug the failures that this commit is trying to fix. It's making
the buildfarm sad.
Discussion: http://postgr.es/m/CA+TgmobWFb8NqyfC31YnKAbZiXf9tLuwmyuvx=iYMXMniPQ4nw@mail.gmail.com
The tests in 002_blocks.pl are failing in the buildfarm from time to
time, but we don't know how to reproduce the failure elsewhere. The
most obvious explanation seems to be the unexpected disappearance of a
WAL summary file, so bump up the logging level in
RemoveWalSummaryIfOlderThan to try to help us spot such problems, and
print the cutoff time in addition to the removed filename. Also
adjust 002_blocks.pl to dump out a directory listing of the relevant
directory at various points.
This patch should be reverted once we sort out what's happening here.
Patch by me, reviewed by Nathan Bossart, who also reported the issue.
Discussion: http://postgr.es/m/20240124170846.GA2643050@nathanxps13
When active, this process writes WAL summary files to
$PGDATA/pg_wal/summaries. Each summary file contains information for a
certain range of LSNs on a certain TLI. For each relation, it stores a
"limit block" which is 0 if a relation is created or destroyed within
a certain range of WAL records, or otherwise the shortest length to
which the relation was truncated during that range of WAL records, or
otherwise InvalidBlockNumber. In addition, it stores a list of blocks
which have been modified during that range of WAL records, but
excluding blocks which were removed by truncation after they were
modified and never subsequently modified again.
In other words, it tells us which blocks need to copied in case of an
incremental backup covering that range of WAL records. But this
doesn't yet add the capability to actually perform an incremental
backup; the next patch will do that.
A new parameter summarize_wal enables or disables this new background
process. The background process also automatically deletes summary
files that are older than wal_summarize_keep_time, if that parameter
has a non-zero value and the summarizer is configured to run.
Patch by me, with some design help from Dilip Kumar and Andres Freund.
Reviewed by Matthias van de Meent, Dilip Kumar, Jakub Wartak, Peter
Eisentraut, and Álvaro Herrera.
Discussion: http://postgr.es/m/CA+TgmoYOYZfMCyOXFyC-P+-mdrZqm5pP2N7S-r0z3_402h9rsA@mail.gmail.com
Nathan Bossart
Robert Haas
Bruce Momjian