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Remove the "snapshot too old" feature.

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Remove the old_snapshot_threshold setting and mechanism for producing
the error "snapshot too old", originally added by commit 848ef42b.
Unfortunately it had a number of known problems in terms of correctness
and performance, mostly reported by Andres in the course of his work on
snapshot scalability.  We agreed to remove it, after a long period
without an active plan to fix it.

This is certainly a desirable feature, and someone might propose a new
or improved implementation in the future.

Reported-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/CACG%3DezYV%2BEvO135fLRdVn-ZusfVsTY6cH1OZqWtezuEYH6ciQA%40mail.gmail.com
Discussion: https://postgr.es/m/20200401064008.qob7bfnnbu4w5cw4%40alap3.anarazel.de
Discussion: https://postgr.es/m/CA%2BTgmoY%3Daqf0zjTD%2B3dUWYkgMiNDegDLFjo%2B6ze%3DWtpik%2B3XqA%40mail.gmail.com
This commit is contained in:
Thomas Munro
2023-09-05 18:26:12 +12:00
parent aa0d350456
commit f691f5b80a
50 changed files with 21 additions and 1425 deletions
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4
src/backend/utils/errcodes.txt
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@@ -439,10 +439,6 @@ Section: Class 58 - System Error (errors external to PostgreSQL itself)
58P01 E ERRCODE_UNDEFINED_FILE undefined_file
58P02 E ERRCODE_DUPLICATE_FILE duplicate_file
Section: Class 72 - Snapshot Failure
# (class borrowed from Oracle)
72000 E ERRCODE_SNAPSHOT_TOO_OLD snapshot_too_old
Section: Class F0 - Configuration File Error
# (PostgreSQL-specific error class)