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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/backend/access/transam/xlogreader.c
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@ -44,6 +44,8 @@ static bool ValidXLogRecordHeader(XLogReaderState *state, XLogRecPtr RecPtr,
static bool ValidXLogRecord(XLogReaderState *state, XLogRecord *record,
XLogRecPtr recptr);
static void ResetDecoder(XLogReaderState *state);
static void WALOpenSegmentInit(WALOpenSegment *seg, WALSegmentContext *segcxt,
int segsize, const char *waldir);
/* size of the buffer allocated for error message. */
#define MAX_ERRORMSG_LEN 1000
@ -210,7 +212,7 @@ allocate_recordbuf(XLogReaderState *state, uint32 reclength)
/*
* Initialize the passed segment structs.
*/
void
static void
WALOpenSegmentInit(WALOpenSegment *seg, WALSegmentContext *segcxt,
int segsize, const char *waldir)
{