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Commit3ba1776

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Improve tuplestore's error messages for I/O failures.
We should report the errno when we get a failure from functions likeBufFileWrite. "ERROR: write failed" is unreasonably taciturn for acase that's well within the realm of possibility; I've seen it acouple times in the buildfarm recently, in situations that wereprobably out-of-disk-space, but it'd be good to see the errnoto confirm it.I think this code was originally written without assuming thatthe buffile.c functions would return useful errno; but most othercallers *are* assuming that, and a quick look at the buffile codegives no reason to suppose otherwise.Also, a couple of the old messages were phrased on the assumptionthat a short read might indicate a logic bug in tuplestore itself;but that code's pretty well tested by now, so a filesystem-levelproblem seems much more likely.
1 parentb37e574 commit3ba1776

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2 files changed

+47
-22
lines changed

2 files changed

+47
-22
lines changed

‎src/backend/utils/sort/logtape.c‎

Lines changed: 1 addition & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -208,11 +208,9 @@ ltsWriteBlock(LogicalTapeSet *lts, long blocknum, void *buffer)
208208
if (BufFileSeekBlock(lts->pfile,blocknum)!=0||
209209
BufFileWrite(lts->pfile,buffer,BLCKSZ)!=BLCKSZ)
210210
ereport(ERROR,
211-
/* XXX is it okay to assume errno is correct? */
212211
(errcode_for_file_access(),
213212
errmsg("could not write block %ld of temporary file: %m",
214-
blocknum),
215-
errhint("Perhaps out of disk space?")));
213+
blocknum)));
216214
}
217215

218216
/*
@@ -227,7 +225,6 @@ ltsReadBlock(LogicalTapeSet *lts, long blocknum, void *buffer)
227225
if (BufFileSeekBlock(lts->pfile,blocknum)!=0||
228226
BufFileRead(lts->pfile,buffer,BLCKSZ)!=BLCKSZ)
229227
ereport(ERROR,
230-
/* XXX is it okay to assume errno is correct? */
231228
(errcode_for_file_access(),
232229
errmsg("could not read block %ld of temporary file: %m",
233230
blocknum)));

‎src/backend/utils/sort/tuplestore.c‎

Lines changed: 46 additions & 18 deletions
Original file line numberDiff line numberDiff line change
@@ -501,15 +501,19 @@ tuplestore_select_read_pointer(Tuplestorestate *state, int ptr)
501501
state->writepos_file,
502502
state->writepos_offset,
503503
SEEK_SET)!=0)
504-
elog(ERROR,"tuplestore seek failed");
504+
ereport(ERROR,
505+
(errcode_for_file_access(),
506+
errmsg("could not seek in tuplestore temporary file: %m")));
505507
}
506508
else
507509
{
508510
if (BufFileSeek(state->myfile,
509511
readptr->file,
510512
readptr->offset,
511513
SEEK_SET)!=0)
512-
elog(ERROR,"tuplestore seek failed");
514+
ereport(ERROR,
515+
(errcode_for_file_access(),
516+
errmsg("could not seek in tuplestore temporary file: %m")));
513517
}
514518
break;
515519
default:
@@ -834,7 +838,9 @@ tuplestore_puttuple_common(Tuplestorestate *state, void *tuple)
834838
if (BufFileSeek(state->myfile,
835839
state->writepos_file,state->writepos_offset,
836840
SEEK_SET)!=0)
837-
elog(ERROR,"tuplestore seek to EOF failed");
841+
ereport(ERROR,
842+
(errcode_for_file_access(),
843+
errmsg("could not seek in tuplestore temporary file: %m")));
838844
state->status=TSS_WRITEFILE;
839845

840846
/*
@@ -936,7 +942,9 @@ tuplestore_gettuple(Tuplestorestate *state, bool forward,
936942
if (BufFileSeek(state->myfile,
937943
readptr->file,readptr->offset,
938944
SEEK_SET)!=0)
939-
elog(ERROR,"tuplestore seek failed");
945+
ereport(ERROR,
946+
(errcode_for_file_access(),
947+
errmsg("could not seek in tuplestore temporary file: %m")));
940948
state->status=TSS_READFILE;
941949
/* FALL THRU into READFILE case */
942950

@@ -998,7 +1006,9 @@ tuplestore_gettuple(Tuplestorestate *state, bool forward,
9981006
if (BufFileSeek(state->myfile,0,
9991007
-(long) (tuplen+sizeof(unsignedint)),
10001008
SEEK_CUR)!=0)
1001-
elog(ERROR,"bogus tuple length in backward scan");
1009+
ereport(ERROR,
1010+
(errcode_for_file_access(),
1011+
errmsg("could not seek in tuplestore temporary file: %m")));
10021012
Assert(!state->truncated);
10031013
returnNULL;
10041014
}
@@ -1013,7 +1023,9 @@ tuplestore_gettuple(Tuplestorestate *state, bool forward,
10131023
if (BufFileSeek(state->myfile,0,
10141024
-(long)tuplen,
10151025
SEEK_CUR)!=0)
1016-
elog(ERROR,"bogus tuple length in backward scan");
1026+
ereport(ERROR,
1027+
(errcode_for_file_access(),
1028+
errmsg("could not seek in tuplestore temporary file: %m")));
10171029
tup=READTUP(state,tuplen);
10181030
returntup;
10191031

@@ -1213,7 +1225,9 @@ tuplestore_rescan(Tuplestorestate *state)
12131225
caseTSS_READFILE:
12141226
readptr->eof_reached= false;
12151227
if (BufFileSeek(state->myfile,0,0L,SEEK_SET)!=0)
1216-
elog(ERROR,"tuplestore seek to start failed");
1228+
ereport(ERROR,
1229+
(errcode_for_file_access(),
1230+
errmsg("could not seek in tuplestore temporary file: %m")));
12171231
break;
12181232
default:
12191233
elog(ERROR,"invalid tuplestore state");
@@ -1276,14 +1290,18 @@ tuplestore_copy_read_pointer(Tuplestorestate *state,
12761290
state->writepos_file,
12771291
state->writepos_offset,
12781292
SEEK_SET)!=0)
1279-
elog(ERROR,"tuplestore seek failed");
1293+
ereport(ERROR,
1294+
(errcode_for_file_access(),
1295+
errmsg("could not seek in tuplestore temporary file: %m")));
12801296
}
12811297
else
12821298
{
12831299
if (BufFileSeek(state->myfile,
12841300
dptr->file,dptr->offset,
12851301
SEEK_SET)!=0)
1286-
elog(ERROR,"tuplestore seek failed");
1302+
ereport(ERROR,
1303+
(errcode_for_file_access(),
1304+
errmsg("could not seek in tuplestore temporary file: %m")));
12871305
}
12881306
}
12891307
elseif (srcptr==state->activeptr)
@@ -1427,10 +1445,10 @@ getlen(Tuplestorestate *state, bool eofOK)
14271445
nbytes=BufFileRead(state->myfile, (void*)&len,sizeof(len));
14281446
if (nbytes==sizeof(len))
14291447
returnlen;
1430-
if (nbytes!=0)
1431-
elog(ERROR,"unexpected end of tape");
1432-
if (!eofOK)
1433-
elog(ERROR,"unexpected end of data");
1448+
if (nbytes!=0|| !eofOK)
1449+
ereport(ERROR,
1450+
(errcode_for_file_access(),
1451+
errmsg("could not read from tuplestore temporary file: %m")));
14341452
return0;
14351453
}
14361454

@@ -1469,14 +1487,20 @@ writetup_heap(Tuplestorestate *state, void *tup)
14691487

14701488
if (BufFileWrite(state->myfile, (void*)&tuplen,
14711489
sizeof(tuplen))!=sizeof(tuplen))
1472-
elog(ERROR,"write failed");
1490+
ereport(ERROR,
1491+
(errcode_for_file_access(),
1492+
errmsg("could not write to tuplestore temporary file: %m")));
14731493
if (BufFileWrite(state->myfile, (void*)tupbody,
14741494
tupbodylen)!= (size_t)tupbodylen)
1475-
elog(ERROR,"write failed");
1495+
ereport(ERROR,
1496+
(errcode_for_file_access(),
1497+
errmsg("could not write to tuplestore temporary file: %m")));
14761498
if (state->backward)/* need trailing length word? */
14771499
if (BufFileWrite(state->myfile, (void*)&tuplen,
14781500
sizeof(tuplen))!=sizeof(tuplen))
1479-
elog(ERROR,"write failed");
1501+
ereport(ERROR,
1502+
(errcode_for_file_access(),
1503+
errmsg("could not write to tuplestore temporary file: %m")));
14801504

14811505
FREEMEM(state,GetMemoryChunkSpace(tuple));
14821506
heap_free_minimal_tuple(tuple);
@@ -1495,10 +1519,14 @@ readtup_heap(Tuplestorestate *state, unsigned int len)
14951519
tuple->t_len=tuplen;
14961520
if (BufFileRead(state->myfile, (void*)tupbody,
14971521
tupbodylen)!= (size_t)tupbodylen)
1498-
elog(ERROR,"unexpected end of data");
1522+
ereport(ERROR,
1523+
(errcode_for_file_access(),
1524+
errmsg("could not read from tuplestore temporary file: %m")));
14991525
if (state->backward)/* need trailing length word? */
15001526
if (BufFileRead(state->myfile, (void*)&tuplen,
15011527
sizeof(tuplen))!=sizeof(tuplen))
1502-
elog(ERROR,"unexpected end of data");
1528+
ereport(ERROR,
1529+
(errcode_for_file_access(),
1530+
errmsg("could not read from tuplestore temporary file: %m")));
15031531
return (void*)tuple;
15041532
}

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