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Fix crash in WAL sender when starting physical replication

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Since database connections can be used with WAL senders in 9.4, it is
possible to use physical replication.  This commit fixes a crash when
starting physical replication with a WAL sender using a database
connection, caused by the refactoring done in 850196b.

There have been discussions about forbidding the use of physical
replication in a database connection, but this is left for later,
taking care only of the crash new to 13.

While on it, add a test to check for a failure when attempting logical
replication if the WAL sender does not have a database connection.  This
part is extracted from a larger patch by Kyotaro Horiguchi.

Reported-by: Vladimir Sitnikov
Author: Michael Paquier, Kyotaro Horiguchi
Reviewed-by: Kyotaro Horiguchi, Álvaro Herrera
Discussion: https://postgr.es/m/CAB=Je-GOWMj1PTPkeUhjqQp-4W3=nW-pXe2Hjax6rJFffB5_Aw@mail.gmail.com
Backpatch-through: 13
This commit is contained in:
Michael Paquier
2020-06-08 10:12:24 +09:00
parent 5a2398b0b2
commit 879ad9f90e
4 changed files with 31 additions and 26 deletions
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4
src/include/access/xlogreader.h
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@ -262,10 +262,6 @@ extern XLogReaderRoutine *LocalXLogReaderRoutine(void);
/* Free an XLogReader */
extern void XLogReaderFree(XLogReaderState *state);
/* Initialize supporting structures */
extern void WALOpenSegmentInit(WALOpenSegment *seg, WALSegmentContext *segcxt,
int segsize, const char *waldir);
/* Position the XLogReader to given record */
extern void XLogBeginRead(XLogReaderState *state, XLogRecPtr RecPtr);
#ifdef FRONTEND