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Improved HNSW vacuuming

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This commit is contained in:
Andrew Kane
2023-08-13 15:53:07 -07:00
parent 304e262a41
commit 6fc7d06313
2 changed files with 20 additions and 7 deletions
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25
src/hnswutils.c
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@@ -566,7 +566,13 @@ HnswSearchLayer(Datum q, List *ep, int ef, int lc, Relation index, FmgrInfo *pro
pairingheap_add(C, &(CreatePairingHeapNode(hc)->ph_node));
pairingheap_add(W, &(CreatePairingHeapNode(hc)->ph_node));
wlen++;
/*
* Do not count elements being deleted towards ef when vacuuming. It
* would be ideal to do this for inserts as well, but this could
* affect insert performance.
*/
if (skipElement == NULL || list_length(hc->element->heaptids) != 0)
wlen++;
}
while (!pairingheap_is_empty(C))
@@ -625,12 +631,19 @@ HnswSearchLayer(Datum q, List *ep, int ef, int lc, Relation index, FmgrInfo *pro
pairingheap_add(C, &(CreatePairingHeapNode(ec)->ph_node));
pairingheap_add(W, &(CreatePairingHeapNode(ec)->ph_node));
/* TODO Possibly don't count elements being deleted in wlen */
wlen++;
/*
* Do not count elements being deleted towards ef when
* vacuuming. It would be ideal to do this for inserts as
* well, but this could affect insert performance.
*/
if (skipElement == NULL || list_length(e->element->heaptids) != 0)
{
wlen++;
/* No need to decrement wlen */
if (wlen > ef)
pairingheap_remove_first(W);
/* No need to decrement wlen */
if (wlen > ef)
pairingheap_remove_first(W);
}
}
}
}

2
test/t/016_hnsw_vacuum_recall.pl
View File

@@ -61,7 +61,7 @@ $node->safe_psql("postgres",
);
# Add index
$node->safe_psql("postgres", "CREATE INDEX ON tst USING hnsw (v vector_l2_ops) WITH (m = 4);");
$node->safe_psql("postgres", "CREATE INDEX ON tst USING hnsw (v vector_l2_ops) WITH (m = 4, ef_construction = 8);");
# Delete data
$node->safe_psql("postgres", "DELETE FROM tst WHERE i > 2500;");