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一、問題:requested timeline %u does not contain minimum recovery point %X/%X on timeline %u
該日志在代碼中的位置如下:
StartupXLOG:
if (!XLogRecPtrIsInvalid(ControlFile->minRecoveryPoint) &&
tliOfPointInHistory(ControlFile->minRecoveryPoint - 1, expectedTLEs) !=
ControlFile->minRecoveryPointTLI)
ereport(FATAL,
(errmsg("requested timeline %u does not contain minimum recovery point %X/%X on timeline %u",
recoveryTargetTLI,
(uint32) (ControlFile->minRecoveryPoint >> 32),
(uint32) ControlFile->minRecoveryPoint,
ControlFile->minRecoveryPointTLI)));
二、分析
recoveryTargetTLI這個(gè)值是什么呢?
1、改值在啟動(dòng)恢復(fù)過程中變化如下:
StartupXLOG:
...
if (ControlFile->minRecoveryPointTLI > ControlFile->checkPointCopy.ThisTimeLineID)
recoveryTargetTLI = ControlFile->minRecoveryPointTLI;
else
recoveryTargetTLI = ControlFile->checkPointCopy.ThisTimeLineID;
readRecoveryCommandFile();
|-- for (item = head; item; item = item->next){
| ...
| 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);
| }
| ...
| }
| ...
| if (rtliGiven){
| if (rtli){
| recoveryTargetTLI = rtli;
| recoveryTargetIsLatest = false;
| }else{
| recoveryTargetTLI = findNewestTimeLine(recoveryTargetTLI);
| recoveryTargetIsLatest = true;
| }
|-- }
首先,pg_control文件記錄的最小恢復(fù)點(diǎn)時(shí)間線ControlFile->minRecoveryPointTLI會(huì)和pg_control文件記錄的checkpoint的的時(shí)間線?ControlFile->checkPointCopy.ThisTimeLineID比較,recoveryTargetTLI取兩者之間較大值。
然后readRecoveryCommandFile會(huì)讀取recovery.cnf文件,如果是主機(jī)則沒有recovery.cnf文件。recovery.cnf文件中recovery_target_timeline的值指定恢復(fù)到的時(shí)間線,如果是latest則時(shí)間線rtli為0否則為其指定值;如果rtli是指定值,則recoveryTargetTLI為指定值,否則從第一步獲取的recoveryTargetTLI值+1開始,看是否有其對(duì)于的history文件,找到最大時(shí)間線對(duì)于的history文件,recoveryTargetTLI為該時(shí)間線。
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