WaitForWALToBecomeAvailable: if (!InArcHiveRecovery) currentSource = XLOG_FROM_PG_WAL;
WaitForWALToBecomeAvailable:
if (!InArcHiveRecovery)
currentSource = XLOG_FROM_PG_WAL;
else if (currentSource == 0)
currentSource = XLOG_FROM_ARCHIVE;
for (;;){
int oldSource = currentSource;
if (lastSourceFailed){
switch (currentSource){
case XLOG_FROM_ARCHIVE:
case XLOG_FROM_PG_WAL://如果是备机,并且执行了promote或者存在TriggerFile文件则shutdown receive进程
if (StandbyMode && CheckForStandbyTrigger()){
ShutdownWalRcv();
return false;
}
if (!StandbyMode)
return false;
if (PrimaryConnInfo){
if (fetching_ckpt){
ptr = RedoStartLSN;
tli = ControlFile->checkPointCopy.ThisTimeLineID;
}else{
ptr = RecPtr;
tli = tliofPointInHistory(tliRecPtr, expectedTLEs);
}
curFileTLI = tli;
RequestXLogStreaming(tli, ptr, PrimaryConnInfo, PrimarySlotName);
receivedUpto = 0;
}
currentSource = XLOG_FROM_STREAM;
break;
...
}
}
...
}
RequestXLogStreaming:
if (recptr % XLogSegSize != 0)
recptr -= recptr % XLogSegSize;
walrcv->receiveStart = recptr;
walrcv->receiveStartTLI = tli;
SendPostmasterSignal(PMSIGNAL_START_WALRECEIVER);//发起信号唤醒receiver进程
--结束END--
本文标题: PostgreSQL构建流复制拉取日志的起始位置在哪里
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