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fix(bug): dashtable split crashes when moving items from the old segment (#318)

fix(bug): dashtable split crashes when moving items from the old segment.

Segment's Insert function uses an opportunistic heuristic that chose a bucket with smaller items among two available.
This creates a problem with split that goes from a smaller bucket to the biggest one and moves items to the new segment.
In rare case, the heurstic fills up a the next bucket with items that could reside in earlier buckets and then that bucket
does not have space for its own items. Eventually, items that had enough space in the old segment do not find space in the new one

The fix is to adopt a conservative approach during split and try to use a home bucket first. Home bucket is usually a smaller one.
This approach should be optimal because Split starts with smaller buckets first (can be proven iteratively).

Signed-off-by: Roman Gershman <roman@dragonflydb.io>

Signed-off-by: Roman Gershman <roman@dragonflydb.io>
This commit is contained in:
Roman Gershman 2022-09-20 10:57:41 -07:00 committed by GitHub
parent 751bcb9aec
commit 082ac36ac1
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
4 changed files with 803 additions and 10 deletions

View file

@ -11,7 +11,7 @@ cxx_test(dfly_core_test dfly_core LABELS DFLY)
cxx_test(compact_object_test dfly_core LABELS DFLY)
cxx_test(extent_tree_test dfly_core LABELS DFLY)
cxx_test(external_alloc_test dfly_core LABELS DFLY)
cxx_test(dash_test dfly_core LABELS DFLY)
cxx_test(dash_test dfly_core file DATA testdata/ids.txt LABELS DFLY)
cxx_test(interpreter_test dfly_core LABELS DFLY)
cxx_test(json_test dfly_core TRDP::jsoncons LABELS DFLY)
cxx_test(string_set_test dfly_core LABELS DFLY)

View file

@ -492,7 +492,12 @@ template <typename _Key, typename _Value, typename Policy = DefaultSegmentPolicy
// Returns valid iterator if succeeded or invalid if not (it's full).
// Requires: key should be not present in the segment.
template <typename U, typename V> Iterator InsertUniq(U&& key, V&& value, Hash_t key_hash);
// if spread is true, tries to spread the load between neighbour and home buckets,
// otherwise chooses home bucket first.
// TODO: I am actually not sure if spread optimization is helpful. Worth checking
// whether we get higher occupancy rates when using it.
template <typename U, typename V>
Iterator InsertUniq(U&& key, V&& value, Hash_t key_hash, bool spread);
// capture version change in case of insert.
// Returns ids of buckets whose version would cross ver_threshold upon insertion of key_hash
@ -526,7 +531,8 @@ template <typename _Key, typename _Value, typename Policy = DefaultSegmentPolicy
}
// Bumps up this entry making it more "important" for the eviction policy.
template<typename BumpPolicy> Iterator BumpUp(uint8_t bid, SlotId slot, Hash_t key_hash, const BumpPolicy& ev);
template <typename BumpPolicy>
Iterator BumpUp(uint8_t bid, SlotId slot, Hash_t key_hash, const BumpPolicy& ev);
// Tries to move stash entries back to their normal buckets (exact or neighbour).
// Returns number of entries that succeeded to unload.
@ -1048,7 +1054,7 @@ auto Segment<Key, Value, Policy>::Insert(U&& key, V&& value, Hash_t key_hash, Pr
return std::make_pair(it, false); /* duplicate insert*/
}
it = InsertUniq(std::forward<U>(key), std::forward<V>(value), key_hash);
it = InsertUniq(std::forward<U>(key), std::forward<V>(value), key_hash, true);
return std::make_pair(it, it.found());
}
@ -1181,8 +1187,13 @@ void Segment<Key, Value, Policy>::Split(HFunc&& hfn, Segment* dest_right) {
invalid_mask |= (1u << slot);
auto it = dest_right->InsertUniq(std::forward<Key_t>(key),
std::forward<Value_t>(Value(i, slot)), hash);
std::forward<Value_t>(Value(i, slot)), hash, false);
// we move items residing in a regular bucket to a new segment.
// I do not see a reason why it might overflow to a stash bucket.
assert(it.index < kNumBuckets);
(void)it;
if constexpr (USE_VERSION) {
// Maintaining consistent versioning.
uint64_t ver = bucket_[i].GetVersion();
@ -1218,7 +1229,7 @@ void Segment<Key, Value, Policy>::Split(HFunc&& hfn, Segment* dest_right) {
invalid_mask |= (1u << slot);
auto it = dest_right->InsertUniq(std::forward<Key_t>(Key(bid, slot)),
std::forward<Value_t>(Value(bid, slot)), hash);
std::forward<Value_t>(Value(bid, slot)), hash, false);
(void)it;
assert(it.index != kNanBid);
@ -1283,7 +1294,8 @@ bool Segment<Key, Value, Policy>::CheckIfMovesToOther(bool own_items, unsigned f
template <typename Key, typename Value, typename Policy>
template <typename U, typename V>
auto Segment<Key, Value, Policy>::InsertUniq(U&& key, V&& value, Hash_t key_hash) -> Iterator {
auto Segment<Key, Value, Policy>::InsertUniq(U&& key, V&& value, Hash_t key_hash, bool spread)
-> Iterator {
const uint8_t bid = BucketIndex(key_hash);
const uint8_t nid = NextBid(bid);
@ -1295,7 +1307,7 @@ auto Segment<Key, Value, Policy>::InsertUniq(U&& key, V&& value, Hash_t key_hash
unsigned ts = target.Size(), ns = neighbor.Size();
bool probe = false;
if (ts > ns) {
if (spread && ts > ns) {
insert_first = &neighbor;
probe = true;
}
@ -1305,6 +1317,12 @@ auto Segment<Key, Value, Policy>::InsertUniq(U&& key, V&& value, Hash_t key_hash
insert_first->Insert(slot, std::forward<U>(key), std::forward<V>(value), meta_hash, probe);
return Iterator{uint8_t(insert_first - bucket_), uint8_t(slot)};
} else if (!spread) {
int slot = neighbor.FindEmptySlot();
if (slot >= 0) {
neighbor.Insert(slot, std::forward<U>(key), std::forward<V>(value), meta_hash, true);
return Iterator{nid, uint8_t(slot)};
}
}
int displace_index = MoveToOther(true, nid, NextBid(nid));
@ -1551,7 +1569,8 @@ auto Segment<Key, Value, Policy>::FindValidStartingFrom(unsigned bid, unsigned s
template <typename Key, typename Value, typename Policy>
template <typename BumpPolicy>
auto Segment<Key, Value, Policy>::BumpUp(uint8_t bid, SlotId slot, Hash_t key_hash, const BumpPolicy& bp) -> Iterator {
auto Segment<Key, Value, Policy>::BumpUp(uint8_t bid, SlotId slot, Hash_t key_hash,
const BumpPolicy& bp) -> Iterator {
auto& from = bucket_[bid];
uint8_t target_bid = BucketIndex(key_hash);

View file

@ -16,6 +16,8 @@
#include "base/hash.h"
#include "base/logging.h"
#include "base/zipf_gen.h"
#include "io/file.h"
#include "io/line_reader.h"
extern "C" {
#include "redis/dict.h"
@ -796,6 +798,32 @@ TEST_F(DashTest, Sds) {
// dt.Insert(std::string_view{"bar"}, 1);
}
struct BlankPolicy : public BasicDashPolicy {
static uint64_t HashFn(uint64_t v) {
return v;
}
};
// The bug was that for very rare cases when during segment splitting we move all the items
// into a new segment, not every item finds a place.
TEST_F(DashTest, SplitBug) {
DashTable<uint64_t, uint64_t, BlankPolicy> table;
io::ReadonlyFileOrError fl_err =
io::OpenRead(base::ProgramRunfile("testdata/ids.txt"), io::ReadonlyFile::Options{});
CHECK(fl_err);
io::FileSource fs(std::move(*fl_err));
io::LineReader lr(&fs, DO_NOT_TAKE_OWNERSHIP);
string_view line;
uint64_t val;
while (lr.Next(&line)) {
CHECK(absl::SimpleHexAtoi(line, &val));
table.Insert(val, 0);
}
EXPECT_EQ(746, table.size());
}
/**
______ _ _ _ _______ _
| ____| (_) | | (_) |__ __| | |

746
src/core/testdata/ids.txt vendored Normal file
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