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Fixed duplicate connections when repairing graph

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This commit is contained in:
Andrew Kane
2023-08-16 17:07:19 -07:00
parent 8c5c0f791e
commit b72a22b3c0
3 changed files with 25 additions and 5 deletions
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2
src/hnsw.h
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@@ -271,7 +271,7 @@ void HnswSetNeighborTuple(HnswNeighborTuple ntup, HnswElement e, int m);
void HnswAddHeapTid(HnswElement element, ItemPointer heaptid);
void HnswInitNeighbors(HnswElement element, int m);
bool HnswInsertTuple(Relation index, Datum *values, bool *isnull, ItemPointer heap_tid, Relation heapRel);
void UpdateNeighborPages(Relation index, FmgrInfo *procinfo, Oid collation, HnswElement e, int m);
void UpdateNeighborPages(Relation index, FmgrInfo *procinfo, Oid collation, HnswElement e, int m, bool checkExisting);
void HnswLoadElement(HnswElement element, float *distance, Datum *q, Relation index, FmgrInfo *procinfo, Oid collation, bool loadVec);
void HnswSetElementTuple(HnswElementTuple etup, HnswElement element);
void HnswUpdateConnection(HnswElement element, HnswCandidate * hc, int m, int lc, int *updateIdx, Relation index, FmgrInfo *procinfo, Oid collation);

26
src/hnswinsert.c
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@@ -283,11 +283,28 @@ WriteNewElementPages(Relation index, HnswElement e, int m, BlockNumber insertPag
*updatedInsertPage = newInsertPage;
}
/*
* Check if connection already exists
*/
static bool
ConnectionExists(HnswElement e, HnswNeighborTuple ntup, int startIdx, int lm)
{
for (int i = 0; i < lm; i++)
{
ItemPointer indextid = &ntup->indextids[startIdx + i];
if (ItemPointerGetBlockNumber(indextid) == e->blkno && ItemPointerGetOffsetNumber(indextid) == e->offno)
return true;
}
return false;
}
/*
* Update neighbors
*/
void
UpdateNeighborPages(Relation index, FmgrInfo *procinfo, Oid collation, HnswElement e, int m)
UpdateNeighborPages(Relation index, FmgrInfo *procinfo, Oid collation, HnswElement e, int m, bool checkExisting)
{
for (int lc = e->level; lc >= 0; lc--)
{
@@ -339,7 +356,10 @@ UpdateNeighborPages(Relation index, FmgrInfo *procinfo, Oid collation, HnswEleme
/* Calculate index for update */
startIdx = (hc->element->level - lc) * m;
if (idx == -2)
/* Check for existing connection */
if (checkExisting && ConnectionExists(e, ntup, startIdx, lm))
idx = -1;
else if (idx == -2)
{
/* Find free offset if still exists */
/* TODO Retry updating connections if not */
@@ -496,7 +516,7 @@ WriteElement(Relation index, FmgrInfo *procinfo, Oid collation, HnswElement elem
HnswUpdateMetaPage(index, 0, NULL, newInsertPage, MAIN_FORKNUM);
/* Update neighbors */
UpdateNeighborPages(index, procinfo, collation, element, m);
UpdateNeighborPages(index, procinfo, collation, element, m, false);
/* Update metapage if needed */
if (element->level > entryPoint->level)

2
src/hnswvacuum.c
View File

@@ -255,7 +255,7 @@ RepairGraphElement(HnswVacuumState * vacuumstate, HnswElement element)
UnlockReleaseBuffer(buf);
/* Update neighbors */
UpdateNeighborPages(index, procinfo, collation, element, m);
UpdateNeighborPages(index, procinfo, collation, element, m, true);
}
/*