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Commitccf3408

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Refuse upgrades from pre-9.0 clusters
Commit695b4a1 added a dependency on retrieving oldestxid frompg_control, which only exists in 9.0 and onwards, but the check for8.4 as the oldest version was retained. Since there has been few ifany complaints of 8.4 upgrades not working, fix by setting 9.0 asthe oldest version supported rather than resurrecting 8.4 support.Backpatch to all supported versions.Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>Discussion:https://postgr.es/m/1973418.1657040382@sss.pgh.pa.usBackpatch-through: v12
1 parent01e98e0 commitccf3408

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‎doc/src/sgml/ref/pgupgrade.sgml

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@@ -67,7 +67,7 @@ PostgreSQL documentation
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</para>
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<para>
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pg_upgrade supports upgrades from8.4.X and later to the current
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pg_upgrade supports upgrades from9.0.X and later to the current
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major release of <productname>PostgreSQL</productname>, including snapshot and beta releases.
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</para>
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</refsect1>

‎src/bin/pg_upgrade/check.c

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@@ -316,8 +316,13 @@ check_cluster_versions(void)
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* upgrades
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*/
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if (GET_MAJOR_VERSION(old_cluster.major_version)<804)
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pg_fatal("This utility can only upgrade from PostgreSQL version 8.4 and later.\n");
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/*
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* The minimum version supported when this code shipped in a major version
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* was 8.4. This has since been raised to 9.0, but the support code for
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* dealing with 8.4 remains to avoid refactoring in a backbranch.
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*/
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if (GET_MAJOR_VERSION(old_cluster.major_version)<900)
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pg_fatal("This utility can only upgrade from PostgreSQL version 9.0 and later.\n");
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/* Only current PG version is supported as a target */
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if (GET_MAJOR_VERSION(new_cluster.major_version)!=GET_MAJOR_VERSION(PG_VERSION_NUM))

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