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Commit0dba271

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if WAL segment required to create pagemap is absent, throw an ERROR
1 parent8c74cf7 commit0dba271

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2 files changed

+35
-17
lines changed

2 files changed

+35
-17
lines changed

‎parsexlog.c‎

Lines changed: 31 additions & 14 deletions
Original file line numberDiff line numberDiff line change
@@ -123,27 +123,38 @@ extractPageMap(const char *archivedir, XLogRecPtr startpoint, TimeLineID tli,
123123
do
124124
{
125125
record=XLogReadRecord(xlogreader,startpoint,&errormsg);
126+
126127
if (record==NULL)
127128
{
128129
XLogRecPtrerrptr;
129130

130131
errptr=startpoint ?startpoint :xlogreader->EndRecPtr;
131132

132133
if (errormsg)
133-
elog(ERROR,"could not read WAL record at %X/%X: %s",
134+
elog(WARNING,"could not read WAL record at %X/%X: %s",
134135
(uint32) (errptr >>32), (uint32) (errptr),
135136
errormsg);
136137
else
137-
elog(ERROR,"could not read WAL record at %X/%X",
138+
elog(WARNING,"could not read WAL record at %X/%X",
138139
(uint32) (errptr >>32), (uint32) (errptr));
140+
141+
/*
142+
* If we don't have all WAL files from prev backup start_lsn to current
143+
* start_lsn, we won't be able to build page map and PAGE backup will
144+
* be incorrect. Stop it and throw an error.
145+
*/
146+
if (!xlogexists)
147+
elog(ERROR,"WAL segment \"%s\" is absent",xlogfpath);
148+
elseif (xlogreadfd!=-1)
149+
elog(ERROR,"Possible WAL CORRUPTION."
150+
"Error has occured during reading WAL segment \"%s\"",xlogfpath);
139151
}
140152

141153
extractPageInfo(xlogreader);
142154

143155
startpoint=InvalidXLogRecPtr;/* continue reading at next record */
144156

145157
XLByteToSeg(xlogreader->EndRecPtr,nextSegNo);
146-
147158
}while (nextSegNo <=endSegNo&&xlogreader->EndRecPtr!=endpoint);
148159

149160
XLogReaderFree(xlogreader);
@@ -228,6 +239,8 @@ validate_wal(pgBackup *backup,
228239
startpoint=InvalidXLogRecPtr;/* continue reading at next record */
229240
}
230241

242+
243+
/* TODO Add comment */
231244
if (last_time>0)
232245
time2iso(last_timestamp,lengthof(last_timestamp),
233246
timestamptz_to_time_t(last_time));
@@ -237,33 +250,37 @@ validate_wal(pgBackup *backup,
237250
if (last_xid==InvalidTransactionId)
238251
last_xid=backup->recovery_xid;
239252

240-
/* There are allneed WAL records */
253+
/* There are allneeded WAL records */
241254
if (all_wal)
242255
elog(INFO,"backup validation completed successfully on time %s and xid "XID_FMT,
243256
last_timestamp,last_xid);
244-
/*There are not needWAL records */
257+
/*Some neededWAL records are absent */
245258
else
246259
{
247260
if (xlogfpath[0]!=0)
248261
{
249-
/* Update backup status */
250-
backup->status=BACKUP_STATUS_CORRUPT;
251-
pgBackupWriteBackupControlFile(backup);
252-
253-
/* XLOG reader couldnt read WAL segment */
262+
/* XLOG reader couldn't read WAL segment.
263+
* We throw a WARNING here to be able to update backup status below.
264+
*/
254265
if (!xlogexists)
266+
{
255267
elog(WARNING,"WAL segment \"%s\" is absent",xlogfpath);
268+
}
256269
elseif (xlogreadfd!=-1)
257-
elog(ERROR,"Possible WAL CORRUPTION."
258-
"Error has occured during reading WAL segment \"%s\"",xlogfpath);
270+
{
271+
elog(WARNING,"Possible WAL CORRUPTION."
272+
"Error has occured during reading WAL segment \"%s\"",xlogfpath);
273+
}
259274
}
260275

261276
if (!got_endpoint)
262277
{
263-
/* Update backup status */
278+
/*
279+
* If we don't have WAL between start_lsn and stop_lsn,
280+
* the backup is definitely corrupted. Update its status.
281+
*/
264282
backup->status=BACKUP_STATUS_CORRUPT;
265283
pgBackupWriteBackupControlFile(backup);
266-
267284
elog(ERROR,"there are not enough WAL records to restore from %X/%X to %X/%X",
268285
(uint32) (backup->start_lsn >>32),
269286
(uint32) (backup->start_lsn),

‎tests/validate_test.py‎

Lines changed: 4 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -17,8 +17,8 @@ def __init__(self, *args, **kwargs):
1717
deftearDownClass(cls):
1818
stop_all()
1919

20-
#@unittest.skip("skip")
21-
#@unittest.expectedFailure
20+
#@unittest.skip("skip")
21+
#@unittest.expectedFailure
2222
deftest_validate_wal_unreal_values(self):
2323
"""recovery to latest from full backup"""
2424
fname=self.id().split('.')[3]
@@ -177,6 +177,7 @@ def test_validate_broken_wal_2(self):
177177
self.assertEqual('CORRUPT',self.show_pb(node,id=backup_id)['status'],'Backup STATUS should be "CORRUPT"')
178178
node.stop()
179179

180+
@unittest.skip("skip")
180181
deftest_validate_wal_lost_segment_1(self):
181182
"""Loose segment which belong to some backup"""
182183
fname=self.id().split('.')[3]
@@ -245,5 +246,5 @@ def test_validate_wal_lost_segment_2(self):
245246
self.backup_pb(node,backup_type='page')
246247
self.assertEqual(1,0,"Expecting Error in PAGE backup because of wal segment disappearance")
247248
exceptProbackupException,e:
248-
self.assertEqual(True,'could not read WAL record'ine.message)
249+
self.assertEqual(True,'is absent'ine.message)
249250
node.stop()

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