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"standby switchover": abort if promotion candidate has WAL replay paused

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If replay is paused, we can't be really sure that more WAL will be received
between the check and the promote operation, which would risk the promote
operation not taking place during the switchover (it would happen
as soon as WAL replay is resumed and pending WAL is replayed).

Therefore we simply quit with an informative slew of messages and
leave the user to sort it out.

GitHub #540.
This commit is contained in:
Ian Barwick
2019-02-05 16:25:44 +09:00
parent 2a529e7e8b
commit cce8b76171
4 changed files with 62 additions and 22 deletions
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repmgr-action-node.c
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@@ -49,6 +49,7 @@ static CheckStatus do_node_check_role(PGconn *conn, OutputMode mode, t_node_info
static CheckStatus do_node_check_slots(PGconn *conn, OutputMode mode, t_node_info *node_info, CheckStatusList *list_output);
static CheckStatus do_node_check_missing_slots(PGconn *conn, OutputMode mode, t_node_info *node_info, CheckStatusList *list_output);
static CheckStatus do_node_check_data_directory(PGconn *conn, OutputMode mode, t_node_info *node_info, CheckStatusList *list_output);
/*
* NODE STATUS
*