Teach walsender to update its process title for replication commands.
Because the code path taken for SQL commands executed in a walsender will update the process title, we pretty much have to update the title for replication commands as well. Otherwise, the title shows "idle" for the rest of a logical walsender's lifetime once it's executed any SQL command. Playing with this, I confirm that a walsender now typically spends most of its life reporting walsender postgres [local] START_REPLICATION Considering this in isolation, it might be better to have it say walsender postgres [local] sending replication data However, consistency with the other cases seems to be a stronger argument. In passing, remove duplicative pgstat_report_activity call. Discussion: https://postgr.es/m/880181.1600026471@sss.pgh.pa.us
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@ -1616,12 +1616,14 @@ exec_replication_command(const char *cmd_string)
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{
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case T_IdentifySystemCmd:
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cmdtag = "IDENTIFY_SYSTEM";
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set_ps_display(cmdtag);
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IdentifySystem();
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EndReplicationCommand(cmdtag);
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break;
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case T_BaseBackupCmd:
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cmdtag = "BASE_BACKUP";
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set_ps_display(cmdtag);
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PreventInTransactionBlock(true, cmdtag);
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SendBaseBackup((BaseBackupCmd *) cmd_node);
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EndReplicationCommand(cmdtag);
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@ -1629,12 +1631,14 @@ exec_replication_command(const char *cmd_string)
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case T_CreateReplicationSlotCmd:
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cmdtag = "CREATE_REPLICATION_SLOT";
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set_ps_display(cmdtag);
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CreateReplicationSlot((CreateReplicationSlotCmd *) cmd_node);
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EndReplicationCommand(cmdtag);
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break;
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case T_DropReplicationSlotCmd:
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cmdtag = "DROP_REPLICATION_SLOT";
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set_ps_display(cmdtag);
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DropReplicationSlot((DropReplicationSlotCmd *) cmd_node);
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EndReplicationCommand(cmdtag);
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break;
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@ -1644,6 +1648,7 @@ exec_replication_command(const char *cmd_string)
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StartReplicationCmd *cmd = (StartReplicationCmd *) cmd_node;
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cmdtag = "START_REPLICATION";
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set_ps_display(cmdtag);
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PreventInTransactionBlock(true, cmdtag);
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if (cmd->kind == REPLICATION_KIND_PHYSICAL)
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@ -1659,6 +1664,7 @@ exec_replication_command(const char *cmd_string)
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case T_TimeLineHistoryCmd:
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cmdtag = "TIMELINE_HISTORY";
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set_ps_display(cmdtag);
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PreventInTransactionBlock(true, cmdtag);
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SendTimeLineHistory((TimeLineHistoryCmd *) cmd_node);
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EndReplicationCommand(cmdtag);
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@ -1670,6 +1676,7 @@ exec_replication_command(const char *cmd_string)
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VariableShowStmt *n = (VariableShowStmt *) cmd_node;
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cmdtag = "SHOW";
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set_ps_display(cmdtag);
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/* syscache access needs a transaction environment */
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StartTransactionCommand();
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@ -1688,8 +1695,11 @@ exec_replication_command(const char *cmd_string)
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MemoryContextSwitchTo(old_context);
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MemoryContextDelete(cmd_context);
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/* Report to pgstat that this process is now idle */
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pgstat_report_activity(STATE_IDLE, NULL);
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/*
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* We need not update ps display or pg_stat_activity, because PostgresMain
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* will reset those to "idle". But we must reset debug_query_string to
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* ensure it doesn't become a dangling pointer.
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*/
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debug_query_string = NULL;
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return true;
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