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-rw-r--r--src/bin/pg_upgrade/controldata.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/bin/pg_upgrade/controldata.c b/src/bin/pg_upgrade/controldata.c
index 0fe98a550e1..4bb2b7e6ec3 100644
--- a/src/bin/pg_upgrade/controldata.c
+++ b/src/bin/pg_upgrade/controldata.c
@@ -591,6 +591,15 @@ check_control_data(ControlData *oldctrl,
*/
/*
+ * If checksums have been turned on in the old cluster, but the
+ * checksumhelper have yet to finish, then disallow upgrading. The user
+ * should either let the process finish, or turn off checksums, before
+ * retrying.
+ */
+ if (oldctrl->data_checksum_version == 2)
+ pg_fatal("transition to data checksums not completed in old cluster\n");
+
+ /*
* We might eventually allow upgrades from checksum to no-checksum
* clusters.
*/