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Commit32f4de0

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committed
Write exact xlog position of timeline switch in the timeline history file.
This allows us to do some more rigorous sanity checking for variousincorrect point-in-time recovery scenarios, and provides more informationfor debugging purposes. It will also come handy in the upcoming patch toallow timeline switches to be replicated by streaming replication.
1 parenta84c30d commit32f4de0

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3 files changed

+247
-90
lines changed

3 files changed

+247
-90
lines changed

‎src/backend/access/transam/timeline.c‎

Lines changed: 120 additions & 24 deletions
Original file line numberDiff line numberDiff line change
@@ -12,10 +12,10 @@
1212
*
1313
* Each line in the file represents a timeline switch:
1414
*
15-
* <parentTLI> <xlogfname> <reason>
15+
* <parentTLI> <switchpoint> <reason>
1616
*
1717
*parentTLIID of the parent timeline
18-
*xlogfnamefilename of the WALsegment where the switch happened
18+
*switchpointXLogRecPtr of the WALposition where the switch happened
1919
*reasonhuman-readable explanation of why the timeline was changed
2020
*
2121
* The fields are separated by tabs. Lines beginning with # are comments, and
@@ -56,10 +56,18 @@ readTimeLineHistory(TimeLineID targetTLI)
5656
charhistfname[MAXFNAMELEN];
5757
charfline[MAXPGPATH];
5858
FILE*fd;
59+
TimeLineHistoryEntry*entry;
60+
TimeLineIDlasttli=0;
61+
XLogRecPtrprevend;
5962

6063
/* Timeline 1 does not have a history file, so no need to check */
6164
if (targetTLI==1)
62-
returnlist_make1_int((int)targetTLI);
65+
{
66+
entry= (TimeLineHistoryEntry*)palloc(sizeof(TimeLineHistoryEntry));
67+
entry->tli=targetTLI;
68+
entry->begin=entry->end=InvalidXLogRecPtr;
69+
returnlist_make1(entry);
70+
}
6371

6472
if (InArchiveRecovery)
6573
{
@@ -77,20 +85,26 @@ readTimeLineHistory(TimeLineID targetTLI)
7785
(errcode_for_file_access(),
7886
errmsg("could not open file \"%s\": %m",path)));
7987
/* Not there, so assume no parents */
80-
returnlist_make1_int((int)targetTLI);
88+
entry= (TimeLineHistoryEntry*)palloc(sizeof(TimeLineHistoryEntry));
89+
entry->tli=targetTLI;
90+
entry->begin=entry->end=InvalidXLogRecPtr;
91+
returnlist_make1(entry);
8192
}
8293

8394
result=NIL;
8495

8596
/*
8697
* Parse the file...
8798
*/
99+
prevend=InvalidXLogRecPtr;
88100
while (fgets(fline,sizeof(fline),fd)!=NULL)
89101
{
90102
/* skip leading whitespace and check for # comment */
91103
char*ptr;
92-
char*endptr;
93104
TimeLineIDtli;
105+
uint32switchpoint_hi;
106+
uint32switchpoint_lo;
107+
intnfields;
94108

95109
for (ptr=fline;*ptr;ptr++)
96110
{
@@ -100,38 +114,56 @@ readTimeLineHistory(TimeLineID targetTLI)
100114
if (*ptr=='\0'||*ptr=='#')
101115
continue;
102116

103-
/* expect a numeric timeline ID as first field of line */
104-
tli= (TimeLineID)strtoul(ptr,&endptr,0);
105-
if (endptr==ptr)
117+
nfields=sscanf(fline,"%u\t%X/%X",&tli,&switchpoint_hi,&switchpoint_lo);
118+
119+
if (nfields<1)
120+
{
121+
/* expect a numeric timeline ID as first field of line */
106122
ereport(FATAL,
107123
(errmsg("syntax error in history file: %s",fline),
108124
errhint("Expected a numeric timeline ID.")));
125+
}
126+
if (nfields!=3)
127+
ereport(FATAL,
128+
(errmsg("syntax error in history file: %s",fline),
129+
errhint("Expected an XLOG switchpoint location.")));
109130

110-
if (result&&
111-
tli <= (TimeLineID)linitial_int(result))
131+
if (result&&tli <=lasttli)
112132
ereport(FATAL,
113133
(errmsg("invalid data in history file: %s",fline),
114134
errhint("Timeline IDs must be in increasing sequence.")));
115135

136+
lasttli=tli;
137+
138+
entry= (TimeLineHistoryEntry*)palloc(sizeof(TimeLineHistoryEntry));
139+
entry->tli=tli;
140+
entry->begin=prevend;
141+
entry->end= ((uint64) (switchpoint_hi)) <<32 | (uint64)switchpoint_lo;
142+
prevend=entry->end;
143+
116144
/* Build list with newest item first */
117-
result=lcons_int((int)tli,result);
145+
result=lcons(entry,result);
118146

119147
/* we ignore the remainder of each line */
120148
}
121149

122150
FreeFile(fd);
123151

124-
if (result&&
125-
targetTLI <= (TimeLineID)linitial_int(result))
152+
if (result&&targetTLI <=lasttli)
126153
ereport(FATAL,
127154
(errmsg("invalid data in history file \"%s\"",path),
128155
errhint("Timeline IDs must be less than child timeline's ID.")));
129156

130-
result=lcons_int((int)targetTLI,result);
157+
/*
158+
* Create one more entry for the "tip" of the timeline, which has no
159+
* entry in the history file.
160+
*/
161+
entry= (TimeLineHistoryEntry*)palloc(sizeof(TimeLineHistoryEntry));
162+
entry->tli=targetTLI;
163+
entry->begin=prevend;
164+
entry->end=InvalidXLogRecPtr;
131165

132-
ereport(DEBUG3,
133-
(errmsg_internal("history of timeline %u is %s",
134-
targetTLI,nodeToString(result))));
166+
result=lcons(entry,result);
135167

136168
returnresult;
137169
}
@@ -214,7 +246,7 @@ findNewestTimeLine(TimeLineID startTLI)
214246
*
215247
*newTLI: ID of the new timeline
216248
*parentTLI: ID of its immediate parent
217-
*endTLI et al: ID ofthelast used WAL file, for annotation purposes
249+
*switchpoint: XLOG position wherethesystem switched to the new timeline
218250
*reason: human-readable explanation of why the timeline was switched
219251
*
220252
* Currently this is only used at the end recovery, and so there are no locking
@@ -223,12 +255,11 @@ findNewestTimeLine(TimeLineID startTLI)
223255
*/
224256
void
225257
writeTimeLineHistory(TimeLineIDnewTLI,TimeLineIDparentTLI,
226-
TimeLineIDendTLI,XLogSegNoendLogSegNo,char*reason)
258+
XLogRecPtrswitchpoint,char*reason)
227259
{
228260
charpath[MAXPGPATH];
229261
chartmppath[MAXPGPATH];
230262
charhistfname[MAXFNAMELEN];
231-
charxlogfname[MAXFNAMELEN];
232263
charbuffer[BLCKSZ];
233264
intsrcfd;
234265
intfd;
@@ -313,13 +344,11 @@ writeTimeLineHistory(TimeLineID newTLI, TimeLineID parentTLI,
313344
* If we did have a parent file, insert an extra newline just in case the
314345
* parent file failed to end with one.
315346
*/
316-
XLogFileName(xlogfname,endTLI,endLogSegNo);
317-
318347
snprintf(buffer,sizeof(buffer),
319-
"%s%u\t%s\t%s\n",
348+
"%s%u\t%X/%X\t%s\n",
320349
(srcfd<0) ?"" :"\n",
321350
parentTLI,
322-
xlogfname,
351+
(uint32) (switchpoint >>32), (uint32) (switchpoint),
323352
reason);
324353

325354
nbytes=strlen(buffer);
@@ -380,3 +409,70 @@ writeTimeLineHistory(TimeLineID newTLI, TimeLineID parentTLI,
380409
TLHistoryFileName(histfname,newTLI);
381410
XLogArchiveNotify(histfname);
382411
}
412+
413+
/*
414+
* Returns true if 'expectedTLEs' contains a timeline with id 'tli'
415+
*/
416+
bool
417+
tliInHistory(TimeLineIDtli,List*expectedTLEs)
418+
{
419+
ListCell*cell;
420+
421+
foreach(cell,expectedTLEs)
422+
{
423+
if (((TimeLineHistoryEntry*)lfirst(cell))->tli==tli)
424+
return true;
425+
}
426+
427+
return false;
428+
}
429+
430+
/*
431+
* Returns the ID of the timeline in use at a particular point in time, in
432+
* the given timeline history.
433+
*/
434+
TimeLineID
435+
tliOfPointInHistory(XLogRecPtrptr,List*history)
436+
{
437+
ListCell*cell;
438+
439+
foreach(cell,history)
440+
{
441+
TimeLineHistoryEntry*tle= (TimeLineHistoryEntry*)lfirst(cell);
442+
if ((XLogRecPtrIsInvalid(tle->begin)||XLByteLE(tle->begin,ptr))&&
443+
(XLogRecPtrIsInvalid(tle->end)||XLByteLT(ptr,tle->end)))
444+
{
445+
/* found it */
446+
returntle->tli;
447+
}
448+
}
449+
450+
/* shouldn't happen. */
451+
elog(ERROR,"timeline history was not contiguous");
452+
return0;/* keep compiler quiet */
453+
}
454+
455+
/*
456+
* Returns the point in history where we branched off the given timeline.
457+
* Returns InvalidXLogRecPtr if the timeline is current (= we have not
458+
* branched off from it), and throws an error if the timeline is not part of
459+
* this server's history.
460+
*/
461+
XLogRecPtr
462+
tliSwitchPoint(TimeLineIDtli,List*history)
463+
{
464+
ListCell*cell;
465+
466+
foreach (cell,history)
467+
{
468+
TimeLineHistoryEntry*tle= (TimeLineHistoryEntry*)lfirst(cell);
469+
470+
if (tle->tli==tli)
471+
returntle->end;
472+
}
473+
474+
ereport(ERROR,
475+
(errmsg("requested timeline %u is not in this server's history",
476+
tli)));
477+
returnInvalidXLogRecPtr;/* keep compiler quiet */
478+
}

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