StartupXLOG->
if (ControlFile->minRecoveryPointTLI >
ControlFile->checkPointCopy.ThisTimeLineID)
recoveryTargetTLI = ControlFile->minRecoveryPointTLI;
else
recoveryTargetTLI = ControlFile->checkPointCopy.ThisTimeLineID;
...
2、接着从recovery.conf文件中读取
1）若设置了recovery_target_timeline值，并且设为latest，那么history列表最大的时间线即为目标时间线
2）否则是recovery.conf文件中设置的时间线值
3）若没有设置recovery_target_timeline值，则目标时间线为第一步中的值
StartupXLOG->readRecoveryCommandFile()->
for (item = head; item; item = item->next){
if (strcmp(item->name, "restore_command") == 0){
...
}else if ...
else if(strcmp(item->name, "recovery_target_timeline") == 0){
rtliGiven = true;
if (strcmp(item->value, "latest") == 0)
rtli = 0;
else
rtli = (TimeLineID) strtoul(item->value, NULL, 0);
}else if...
}
if (rtliGiven){
if (rtli){
recoveryTargetTLI = rtli;
recoveryTargetIsLatest = false;
}else{
/* We start the "latest" search from pg_control's timeline */
recoveryTargetTLI = findNewestTimeLine(recoveryTargetTLI);
recoveryTargetIsLatest = true;
}
}
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