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Revert "Cannot use WL_SOCKET_WRITEABLE without WL_SOCKET_READABLE."

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This reverts commit 3a9e64aa0d.

Commit 4bad60e3 fixed the root of the problem that 3a9e64aa worked
around.

This enables proper pipelining of commands after terminating
replication, eliminating an undocumented limitation.

Discussion: https://postgr.es/m/3d57bc29-4459-578b-79cb-7641baf53c57%40iki.fi
Backpatch-through: 9.5
This commit is contained in:
Jeff Davis 2020-12-14 23:50:20 -08:00
parent da214247de
commit 133a0906d5
1 changed files with 10 additions and 16 deletions
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26
src/backend/replication/walsender.c
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@ -1434,7 +1434,12 @@ ProcessRepliesIfAny(void)
last_processing = GetCurrentTimestamp();
for (;;)
/*
* If we already received a CopyDone from the frontend, any subsequent
* message is the beginning of a new command, and should be processed in
* the main processing loop.
*/
while (!streamingDoneReceiving)
{
pq_startmsgread();
r = pq_getbyte_if_available(&firstchar);
@ -1463,19 +1468,6 @@ ProcessRepliesIfAny(void)
proc_exit(0);
}
/*
* If we already received a CopyDone from the frontend, the frontend
* should not send us anything until we've closed our end of the COPY.
* XXX: In theory, the frontend could already send the next command
* before receiving the CopyDone, but libpq doesn't currently allow
* that.
*/
if (streamingDoneReceiving && firstchar != 'X')
ereport(FATAL,
(errcode(ERRCODE_PROTOCOL_VIOLATION),
errmsg("unexpected standby message type \"%c\", after receiving CopyDone",
firstchar)));
/* Handle the very limited subset of commands expected in this phase */
switch (firstchar)
{
@ -1960,8 +1952,10 @@ WalSndLoop(WalSndSendDataCallback send_data)
long sleeptime;
int wakeEvents;
wakeEvents = WL_LATCH_SET | WL_POSTMASTER_DEATH | WL_TIMEOUT |
WL_SOCKET_READABLE;
wakeEvents = WL_LATCH_SET | WL_POSTMASTER_DEATH | WL_TIMEOUT;
if (!streamingDoneReceiving)
wakeEvents |= WL_SOCKET_READABLE;
/*
* Use fresh timestamp, not last_processed, to reduce the chance