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Update comments for AlterSubscription. 

Add explanation as to why the subscription needs to be disabled to allow
slot_name as none.

Author: Japin Li and Amit Kapila
Discussion: https://postgr.es/m/MEYP282MB1669CBD98E721C77CA696499B61A9@MEYP282MB1669.AUSP282.PROD.OUTLOOK.COM
This commit is contained in:
Amit Kapila 2021-07-19 08:32:37 +05:30
parent 2dbe890571
commit dcecdfafbd
1 changed files with 7 additions and 0 deletions
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7
src/backend/commands/subscriptioncmds.c
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@ -894,6 +894,13 @@ AlterSubscription(ParseState *pstate, AlterSubscriptionStmt *stmt,
if (IsSet(opts.specified_opts, SUBOPT_SLOT_NAME))
{
/*
* The subscription must be disabled to allow slot_name as
* 'none', otherwise, the apply worker will repeatedly try
* to stream the data using that slot_name which neither
* exists on the publisher nor the user will be allowed to
* create it.
*/
if (sub->enabled && !opts.slot_name)
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),