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Represent command completion tags as structs

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The backend was using strings to represent command tags and doing string
comparisons in multiple places, but that's slow and unhelpful.  Create a
new command list with a supporting structure to use instead; this is
stored in a tag-list-file that can be tailored to specific purposes with
a caller-definable C macro, similar to what we do for WAL resource
managers.  The first first such uses are a new CommandTag enum and a
CommandTagBehavior struct.

Replace numerous occurrences of char *completionTag with a
QueryCompletion struct so that the code no longer stores information
about completed queries in a cstring.  Only at the last moment, in
EndCommand(), does this get converted to a string.

EventTriggerCacheItem no longer holds an array of palloc’d tag strings
in sorted order, but rather just a Bitmapset over the CommandTags.

Author: Mark Dilger, with unsolicited help from Álvaro Herrera
Reviewed-by: John Naylor, Tom Lane
Discussion: https://postgr.es/m/981A9DB4-3F0C-4DA5-88AD-CB9CFF4D6CAD@enterprisedb.com
This commit is contained in:
Alvaro Herrera
2020-03-02 18:19:51 -03:00
parent 7b425a5283
commit 2f9661311b
39 changed files with 877 additions and 621 deletions
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2
src/backend/replication/logical/decode.c
View File

@@ -100,7 +100,7 @@ LogicalDecodingProcessRecord(LogicalDecodingContext *ctx, XLogReaderState *recor
buf.record = record;
/* cast so we get a warning when new rmgrs are added */
switch ((RmgrIds) XLogRecGetRmid(record))
switch ((RmgrId) XLogRecGetRmid(record))
{
/*
* Rmgrs we care about for logical decoding. Add new rmgrs in

18
src/backend/replication/walsender.c
View File

@@ -1074,8 +1074,11 @@ CreateReplicationSlot(CreateReplicationSlotCmd *cmd)
static void
DropReplicationSlot(DropReplicationSlotCmd *cmd)
{
QueryCompletion qc;
ReplicationSlotDrop(cmd->slotname, !cmd->wait);
EndCommand("DROP_REPLICATION_SLOT", DestRemote);
SetQueryCompletion(&qc, CMDTAG_DROP_REPLICATION_SLOT, 0);
EndCommand(&qc, DestRemote, false);
}
/*
@@ -1086,6 +1089,7 @@ static void
StartLogicalReplication(StartReplicationCmd *cmd)
{
StringInfoData buf;
QueryCompletion qc;
/* make sure that our requirements are still fulfilled */
CheckLogicalDecodingRequirements();
@@ -1160,7 +1164,8 @@ StartLogicalReplication(StartReplicationCmd *cmd)
WalSndSetState(WALSNDSTATE_STARTUP);
/* Get out of COPY mode (CommandComplete). */
EndCommand("COPY 0", DestRemote);
SetQueryCompletion(&qc, CMDTAG_COPY, 0);
EndCommand(&qc, DestRemote, false);
}
/*
@@ -1464,6 +1469,7 @@ exec_replication_command(const char *cmd_string)
Node *cmd_node;
MemoryContext cmd_context;
MemoryContext old_context;
QueryCompletion qc;
/*
* If WAL sender has been told that shutdown is getting close, switch its
@@ -1614,7 +1620,8 @@ exec_replication_command(const char *cmd_string)
MemoryContextDelete(cmd_context);
/* Send CommandComplete message */
EndCommand("SELECT", DestRemote);
SetQueryCompletion(&qc, CMDTAG_SELECT, 0);
EndCommand(&qc, DestRemote, true);
/* Report to pgstat that this process is now idle */
pgstat_report_activity(STATE_IDLE, NULL);
@@ -2867,8 +2874,11 @@ WalSndDone(WalSndSendDataCallback send_data)
if (WalSndCaughtUp && sentPtr == replicatedPtr &&
!pq_is_send_pending())
{
QueryCompletion qc;
/* Inform the standby that XLOG streaming is done */
EndCommand("COPY 0", DestRemote);
SetQueryCompletion(&qc, CMDTAG_COPY, 0);
EndCommand(&qc, DestRemote, false);
pq_flush();
proc_exit(0);