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Fix initdb's handling of min_wal_size and max_wal_size.

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In commit 3e51b278d, I misinterpreted the coding in setup_config()
as setting min_wal_size and max_wal_size to compile-time-constant
values.  But it's not: there's a hidden dependency on --wal-segsize.
Therefore leaving these variables commented out is the wrong thing.
Per report from Andres Freund.

Discussion: https://postgr.es/m/20230322200751.jvfvsuuhd3hgm6vv@awork3.anarazel.de
This commit is contained in:
Tom Lane 2023-03-22 16:37:41 -04:00
parent 4fe2aa7656
commit b48af6d174
1 changed files with 7 additions and 6 deletions
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13
src/bin/initdb/initdb.c
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@ -1279,6 +1279,13 @@ setup_config(void)
conflines = replace_guc_value(conflines, "dynamic_shared_memory_type",
dynamic_shared_memory_type, false);
/* Caution: these depend on wal_segment_size_mb, they're not constants */
conflines = replace_guc_value(conflines, "min_wal_size",
pretty_wal_size(DEFAULT_MIN_WAL_SEGS), false);
conflines = replace_guc_value(conflines, "max_wal_size",
pretty_wal_size(DEFAULT_MAX_WAL_SEGS), false);
/*
* Fix up various entries to match the true compile-time defaults. Since
* these are indeed defaults, keep the postgresql.conf lines commented.
@ -1289,12 +1296,6 @@ setup_config(void)
conflines = replace_guc_value(conflines, "port",
DEF_PGPORT_STR, true);
conflines = replace_guc_value(conflines, "min_wal_size",
pretty_wal_size(DEFAULT_MIN_WAL_SEGS), true);
conflines = replace_guc_value(conflines, "max_wal_size",
pretty_wal_size(DEFAULT_MAX_WAL_SEGS), true);
#if DEFAULT_BACKEND_FLUSH_AFTER > 0
snprintf(repltok, sizeof(repltok), "%dkB",
DEFAULT_BACKEND_FLUSH_AFTER * (BLCKSZ / 1024));