NextGraph
/
rocksdb
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Provide support for async_io with tailing iterators (#10781)

Browse Source 
Summary:
Provide support for async_io if ReadOptions.tailing is set true.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10781

Test Plan:
- Update unit tests
- Ran db_bench: ./db_bench --benchmarks="readrandom" --use_existing_db --use_tailing_iterator=1 --async_io=1

Reviewed By: anand1976

Differential Revision: D40128882

Pulled By: anand1976

fbshipit-source-id: 55e17855536871a5c47e2de92d238ae005c32d01
main
akankshamahajan 2 years ago committed by Facebook GitHub Bot
parent 5182bf3f83
commit ebf8c454fd
4 changed files with 149 additions and 65 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Show Stats Download Patch File Download Diff File
  1. 1
      HISTORY.md
  2. 79
      db/db_tailing_iter_test.cc
  3. 70
      db/forward_iterator.cc
  4. 4
      db/forward_iterator.h

1
HISTORY.md
Unescape View File

@ -2,6 +2,7 @@
## Unreleased ## Unreleased
### New Features ### New Features
* `DeleteRange()` now supports user-defined timestamp. * `DeleteRange()` now supports user-defined timestamp.
* Provide support for async_io with tailing iterators when ReadOptions.tailing is enabled during scans.
### Bug Fixes ### Bug Fixes
* Fix a bug in io_uring_prep_cancel in AbortIO API for posix which expects sqe->addr to match with read request submitted and wrong paramter was being passed. * Fix a bug in io_uring_prep_cancel in AbortIO API for posix which expects sqe->addr to match with read request submitted and wrong paramter was being passed.

79
db/db_tailing_iter_test.cc
Unescape View File

@ -18,15 +18,22 @@
namespace ROCKSDB_NAMESPACE { namespace ROCKSDB_NAMESPACE {
class DBTestTailingIterator : public DBTestBase { class DBTestTailingIterator : public DBTestBase,
public ::testing::WithParamInterface<bool> {
public: public:
DBTestTailingIterator() DBTestTailingIterator()
: DBTestBase("db_tailing_iterator_test", /*env_do_fsync=*/true) {} : DBTestBase("db_tailing_iterator_test", /*env_do_fsync=*/true) {}
}; };
TEST_F(DBTestTailingIterator, TailingIteratorSingle) { INSTANTIATE_TEST_CASE_P(DBTestTailingIterator, DBTestTailingIterator,
::testing::Bool());
TEST_P(DBTestTailingIterator, TailingIteratorSingle) {
ReadOptions read_options; ReadOptions read_options;
read_options.tailing = true; read_options.tailing = true;
if (GetParam()) {
read_options.async_io = true;
}
std::unique_ptr<Iterator> iter(db_->NewIterator(read_options)); std::unique_ptr<Iterator> iter(db_->NewIterator(read_options));
iter->SeekToFirst(); iter->SeekToFirst();
@ -43,11 +50,13 @@ TEST_F(DBTestTailingIterator, TailingIteratorSingle) {
ASSERT_TRUE(!iter->Valid()); ASSERT_TRUE(!iter->Valid());
} }
TEST_F(DBTestTailingIterator, TailingIteratorKeepAdding) { TEST_P(DBTestTailingIterator, TailingIteratorKeepAdding) {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions()); CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
ReadOptions read_options; ReadOptions read_options;
read_options.tailing = true; read_options.tailing = true;
if (GetParam()) {
read_options.async_io = true;
}
std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1])); std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1]));
ASSERT_OK(iter->status()); ASSERT_OK(iter->status());
std::string value(1024, 'a'); std::string value(1024, 'a');
@ -66,11 +75,13 @@ TEST_F(DBTestTailingIterator, TailingIteratorKeepAdding) {
} }
} }
TEST_F(DBTestTailingIterator, TailingIteratorSeekToNext) { TEST_P(DBTestTailingIterator, TailingIteratorSeekToNext) {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions()); CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
ReadOptions read_options; ReadOptions read_options;
read_options.tailing = true; read_options.tailing = true;
if (GetParam()) {
read_options.async_io = true;
}
std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1])); std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1]));
ASSERT_OK(iter->status()); ASSERT_OK(iter->status());
std::unique_ptr<Iterator> itern(db_->NewIterator(read_options, handles_[1])); std::unique_ptr<Iterator> itern(db_->NewIterator(read_options, handles_[1]));
@ -125,7 +136,7 @@ TEST_F(DBTestTailingIterator, TailingIteratorSeekToNext) {
} }
} }
TEST_F(DBTestTailingIterator, TailingIteratorTrimSeekToNext) { TEST_P(DBTestTailingIterator, TailingIteratorTrimSeekToNext) {
const uint64_t k150KB = 150 * 1024; const uint64_t k150KB = 150 * 1024;
Options options; Options options;
options.write_buffer_size = k150KB; options.write_buffer_size = k150KB;
@ -135,6 +146,9 @@ TEST_F(DBTestTailingIterator, TailingIteratorTrimSeekToNext) {
CreateAndReopenWithCF({"pikachu"}, options); CreateAndReopenWithCF({"pikachu"}, options);
ReadOptions read_options; ReadOptions read_options;
read_options.tailing = true; read_options.tailing = true;
if (GetParam()) {
read_options.async_io = true;
}
int num_iters, deleted_iters; int num_iters, deleted_iters;
char bufe[32]; char bufe[32];
@ -265,10 +279,13 @@ TEST_F(DBTestTailingIterator, TailingIteratorTrimSeekToNext) {
} }
} }
TEST_F(DBTestTailingIterator, TailingIteratorDeletes) { TEST_P(DBTestTailingIterator, TailingIteratorDeletes) {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions()); CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
ReadOptions read_options; ReadOptions read_options;
read_options.tailing = true; read_options.tailing = true;
if (GetParam()) {
read_options.async_io = true;
}
std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1])); std::unique_ptr<Iterator> iter(db_->NewIterator(read_options, handles_[1]));
ASSERT_OK(iter->status()); ASSERT_OK(iter->status());
@ -300,15 +317,18 @@ TEST_F(DBTestTailingIterator, TailingIteratorDeletes) {
// make sure we can read all new records using the existing iterator // make sure we can read all new records using the existing iterator
int count = 0; int count = 0;
for (; iter->Valid(); iter->Next(), ++count) ; for (; iter->Valid(); iter->Next(), ++count)
;
ASSERT_EQ(count, num_records); ASSERT_EQ(count, num_records);
} }
TEST_F(DBTestTailingIterator, TailingIteratorPrefixSeek) { TEST_P(DBTestTailingIterator, TailingIteratorPrefixSeek) {
ReadOptions read_options; ReadOptions read_options;
read_options.tailing = true; read_options.tailing = true;
if (GetParam()) {
read_options.async_io = true;
}
Options options = CurrentOptions(); Options options = CurrentOptions();
options.create_if_missing = true; options.create_if_missing = true;
options.disable_auto_compactions = true; options.disable_auto_compactions = true;
@ -338,10 +358,13 @@ TEST_F(DBTestTailingIterator, TailingIteratorPrefixSeek) {
ASSERT_TRUE(!iter->Valid()); ASSERT_TRUE(!iter->Valid());
} }
TEST_F(DBTestTailingIterator, TailingIteratorIncomplete) { TEST_P(DBTestTailingIterator, TailingIteratorIncomplete) {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions()); CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
ReadOptions read_options; ReadOptions read_options;
read_options.tailing = true; read_options.tailing = true;
if (GetParam()) {
read_options.async_io = true;
}
read_options.read_tier = kBlockCacheTier; read_options.read_tier = kBlockCacheTier;
std::string key("key"); std::string key("key");
@ -361,7 +384,7 @@ TEST_F(DBTestTailingIterator, TailingIteratorIncomplete) {
ASSERT_TRUE(iter->Valid() || iter->status().IsIncomplete()); ASSERT_TRUE(iter->Valid() || iter->status().IsIncomplete());
} }
TEST_F(DBTestTailingIterator, TailingIteratorSeekToSame) { TEST_P(DBTestTailingIterator, TailingIteratorSeekToSame) {
Options options = CurrentOptions(); Options options = CurrentOptions();
options.compaction_style = kCompactionStyleUniversal; options.compaction_style = kCompactionStyleUniversal;
options.write_buffer_size = 1000; options.write_buffer_size = 1000;
@ -369,7 +392,9 @@ TEST_F(DBTestTailingIterator, TailingIteratorSeekToSame) {
ReadOptions read_options; ReadOptions read_options;
read_options.tailing = true; read_options.tailing = true;
if (GetParam()) {
read_options.async_io = true;
}
const int NROWS = 10000; const int NROWS = 10000;
// Write rows with keys 00000, 00002, 00004 etc. // Write rows with keys 00000, 00002, 00004 etc.
for (int i = 0; i < NROWS; ++i) { for (int i = 0; i < NROWS; ++i) {
@ -400,14 +425,16 @@ TEST_F(DBTestTailingIterator, TailingIteratorSeekToSame) {
// Sets iterate_upper_bound and verifies that ForwardIterator doesn't call // Sets iterate_upper_bound and verifies that ForwardIterator doesn't call
// Seek() on immutable iterators when target key is >= prev_key and all // Seek() on immutable iterators when target key is >= prev_key and all
// iterators, including the memtable iterator, are over the upper bound. // iterators, including the memtable iterator, are over the upper bound.
TEST_F(DBTestTailingIterator, TailingIteratorUpperBound) { TEST_P(DBTestTailingIterator, TailingIteratorUpperBound) {
CreateAndReopenWithCF({"pikachu"}, CurrentOptions()); CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
const Slice upper_bound("20", 3); const Slice upper_bound("20", 3);
ReadOptions read_options; ReadOptions read_options;
read_options.tailing = true; read_options.tailing = true;
read_options.iterate_upper_bound = &upper_bound; read_options.iterate_upper_bound = &upper_bound;
if (GetParam()) {
read_options.async_io = true;
}
ASSERT_OK(Put(1, "11", "11")); ASSERT_OK(Put(1, "11", "11"));
ASSERT_OK(Put(1, "12", "12")); ASSERT_OK(Put(1, "12", "12"));
ASSERT_OK(Put(1, "22", "22")); ASSERT_OK(Put(1, "22", "22"));
@ -439,10 +466,14 @@ TEST_F(DBTestTailingIterator, TailingIteratorUpperBound) {
ASSERT_FALSE(it->Valid()); ASSERT_FALSE(it->Valid());
ASSERT_OK(it->status()); ASSERT_OK(it->status());
if (GetParam()) {
ASSERT_EQ(1, immutable_seeks);
} else {
ASSERT_EQ(0, immutable_seeks); ASSERT_EQ(0, immutable_seeks);
} }
}
TEST_F(DBTestTailingIterator, TailingIteratorGap) { TEST_P(DBTestTailingIterator, TailingIteratorGap) {
// level 1: [20, 25] [35, 40] // level 1: [20, 25] [35, 40]
// level 2: [10 - 15] [45 - 50] // level 2: [10 - 15] [45 - 50]
// level 3: [20, 30, 40] // level 3: [20, 30, 40]
@ -455,7 +486,9 @@ TEST_F(DBTestTailingIterator, TailingIteratorGap) {
ReadOptions read_options; ReadOptions read_options;
read_options.tailing = true; read_options.tailing = true;
if (GetParam()) {
read_options.async_io = true;
}
ASSERT_OK(Put(1, "20", "20")); ASSERT_OK(Put(1, "20", "20"));
ASSERT_OK(Put(1, "30", "30")); ASSERT_OK(Put(1, "30", "30"));
ASSERT_OK(Put(1, "40", "40")); ASSERT_OK(Put(1, "40", "40"));
@ -497,9 +530,12 @@ TEST_F(DBTestTailingIterator, TailingIteratorGap) {
ASSERT_OK(it->status()); ASSERT_OK(it->status());
} }
TEST_F(DBTestTailingIterator, SeekWithUpperBoundBug) { TEST_P(DBTestTailingIterator, SeekWithUpperBoundBug) {
ReadOptions read_options; ReadOptions read_options;
read_options.tailing = true; read_options.tailing = true;
if (GetParam()) {
read_options.async_io = true;
}
const Slice upper_bound("cc", 3); const Slice upper_bound("cc", 3);
read_options.iterate_upper_bound = &upper_bound; read_options.iterate_upper_bound = &upper_bound;
@ -520,9 +556,12 @@ TEST_F(DBTestTailingIterator, SeekWithUpperBoundBug) {
ASSERT_EQ(iter->key().ToString(), "aa"); ASSERT_EQ(iter->key().ToString(), "aa");
} }
TEST_F(DBTestTailingIterator, SeekToFirstWithUpperBoundBug) { TEST_P(DBTestTailingIterator, SeekToFirstWithUpperBoundBug) {
ReadOptions read_options; ReadOptions read_options;
read_options.tailing = true; read_options.tailing = true;
if (GetParam()) {
read_options.async_io = true;
}
const Slice upper_bound("cc", 3); const Slice upper_bound("cc", 3);
read_options.iterate_upper_bound = &upper_bound; read_options.iterate_upper_bound = &upper_bound;

70
db/forward_iterator.cc
Unescape View File

@ -351,7 +351,7 @@ void ForwardIterator::SeekToFirst() {
} else if (immutable_status_.IsIncomplete()) { } else if (immutable_status_.IsIncomplete()) {
ResetIncompleteIterators(); ResetIncompleteIterators();
} }
SeekInternal(Slice(), true); SeekInternal(Slice(), true, false);
} }
bool ForwardIterator::IsOverUpperBound(const Slice& internal_key) const { bool ForwardIterator::IsOverUpperBound(const Slice& internal_key) const {
@ -369,21 +369,32 @@ void ForwardIterator::Seek(const Slice& internal_key) {
} else if (immutable_status_.IsIncomplete()) { } else if (immutable_status_.IsIncomplete()) {
ResetIncompleteIterators(); ResetIncompleteIterators();
} }
SeekInternal(internal_key, false);
SeekInternal(internal_key, false, false);
if (read_options_.async_io) {
SeekInternal(internal_key, false, true);
}
} }
// In case of async_io, SeekInternal is called twice with seek_after_async_io
// enabled in second call which only does seeking part to retrieve the blocks.
void ForwardIterator::SeekInternal(const Slice& internal_key, void ForwardIterator::SeekInternal(const Slice& internal_key,
bool seek_to_first) { bool seek_to_first,
bool seek_after_async_io) {
assert(mutable_iter_); assert(mutable_iter_);
// mutable // mutable
seek_to_first ? mutable_iter_->SeekToFirst() : if (!seek_after_async_io) {
mutable_iter_->Seek(internal_key); seek_to_first ? mutable_iter_->SeekToFirst()
: mutable_iter_->Seek(internal_key);
}
// immutable // immutable
// TODO(ljin): NeedToSeekImmutable has negative impact on performance // TODO(ljin): NeedToSeekImmutable has negative impact on performance
// if it turns to need to seek immutable often. We probably want to have // if it turns to need to seek immutable often. We probably want to have
// an option to turn it off. // an option to turn it off.
if (seek_to_first || NeedToSeekImmutable(internal_key)) { if (seek_to_first || seek_after_async_io ||
NeedToSeekImmutable(internal_key)) {
if (!seek_after_async_io) {
immutable_status_ = Status::OK(); immutable_status_ = Status::OK();
if (has_iter_trimmed_for_upper_bound_ && if (has_iter_trimmed_for_upper_bound_ &&
( (
@ -413,6 +424,7 @@ void ForwardIterator::SeekInternal(const Slice& internal_key,
immutable_min_heap_.push(m); immutable_min_heap_.push(m);
} }
} }
}
Slice target_user_key; Slice target_user_key;
if (!seek_to_first) { if (!seek_to_first) {
@ -424,12 +436,19 @@ void ForwardIterator::SeekInternal(const Slice& internal_key,
if (!l0_iters_[i]) { if (!l0_iters_[i]) {
continue; continue;
} }
if (seek_after_async_io) {
if (!l0_iters_[i]->status().IsTryAgain()) {
continue;
}
}
if (seek_to_first) { if (seek_to_first) {
l0_iters_[i]->SeekToFirst(); l0_iters_[i]->SeekToFirst();
} else { } else {
// If the target key passes over the largest key, we are sure Next() // If the target key passes over the largest key, we are sure Next()
// won't go over this file. // won't go over this file.
if (user_comparator_->Compare(target_user_key, if (seek_after_async_io == false &&
user_comparator_->Compare(target_user_key,
l0[i]->largest.user_key()) > 0) { l0[i]->largest.user_key()) > 0) {
if (read_options_.iterate_upper_bound != nullptr) { if (read_options_.iterate_upper_bound != nullptr) {
has_iter_trimmed_for_upper_bound_ = true; has_iter_trimmed_for_upper_bound_ = true;
@ -441,7 +460,10 @@ void ForwardIterator::SeekInternal(const Slice& internal_key,
l0_iters_[i]->Seek(internal_key); l0_iters_[i]->Seek(internal_key);
} }
if (!l0_iters_[i]->status().ok()) { if (l0_iters_[i]->status().IsTryAgain()) {
assert(!seek_after_async_io);
continue;
} else if (!l0_iters_[i]->status().ok()) {
immutable_status_ = l0_iters_[i]->status(); immutable_status_ = l0_iters_[i]->status();
} else if (l0_iters_[i]->Valid() && } else if (l0_iters_[i]->Valid() &&
!IsOverUpperBound(l0_iters_[i]->key())) { !IsOverUpperBound(l0_iters_[i]->key())) {
@ -462,19 +484,30 @@ void ForwardIterator::SeekInternal(const Slice& internal_key,
if (level_iters_[level - 1] == nullptr) { if (level_iters_[level - 1] == nullptr) {
continue; continue;
} }
if (seek_after_async_io) {
if (!level_iters_[level - 1]->status().IsTryAgain()) {
continue;
}
}
uint32_t f_idx = 0; uint32_t f_idx = 0;
if (!seek_to_first) { if (!seek_to_first && !seek_after_async_io) {
f_idx = FindFileInRange(level_files, internal_key, 0, f_idx = FindFileInRange(level_files, internal_key, 0,
static_cast<uint32_t>(level_files.size())); static_cast<uint32_t>(level_files.size()));
} }
// Seek // Seek
if (f_idx < level_files.size()) { if (seek_after_async_io || f_idx < level_files.size()) {
if (!seek_after_async_io) {
level_iters_[level - 1]->SetFileIndex(f_idx); level_iters_[level - 1]->SetFileIndex(f_idx);
seek_to_first ? level_iters_[level - 1]->SeekToFirst() : }
level_iters_[level - 1]->Seek(internal_key); seek_to_first ? level_iters_[level - 1]->SeekToFirst()
: level_iters_[level - 1]->Seek(internal_key);
if (!level_iters_[level - 1]->status().ok()) { if (level_iters_[level - 1]->status().IsTryAgain()) {
assert(!seek_after_async_io);
continue;
} else if (!level_iters_[level - 1]->status().ok()) {
immutable_status_ = level_iters_[level - 1]->status(); immutable_status_ = level_iters_[level - 1]->status();
} else if (level_iters_[level - 1]->Valid() && } else if (level_iters_[level - 1]->Valid() &&
!IsOverUpperBound(level_iters_[level - 1]->key())) { !IsOverUpperBound(level_iters_[level - 1]->key())) {
@ -502,7 +535,11 @@ void ForwardIterator::SeekInternal(const Slice& internal_key,
immutable_min_heap_.push(current_); immutable_min_heap_.push(current_);
} }
// For async_io, it should be updated when seek_after_async_io is true (in
// second call).
if (seek_to_first || !read_options_.async_io || seek_after_async_io) {
UpdateCurrent(); UpdateCurrent();
}
TEST_SYNC_POINT_CALLBACK("ForwardIterator::SeekInternal:Return", this); TEST_SYNC_POINT_CALLBACK("ForwardIterator::SeekInternal:Return", this);
} }
@ -520,7 +557,12 @@ void ForwardIterator::Next() {
} else { } else {
RenewIterators(); RenewIterators();
} }
SeekInternal(old_key, false);
SeekInternal(old_key, false, false);
if (read_options_.async_io) {
SeekInternal(old_key, false, true);
}
if (!valid_ || key().compare(old_key) != 0) { if (!valid_ || key().compare(old_key) != 0) {
return; return;
} }

4
db/forward_iterator.h
Unescape View File

@ -101,7 +101,9 @@ class ForwardIterator : public InternalIterator {
void BuildLevelIterators(const VersionStorageInfo* vstorage, void BuildLevelIterators(const VersionStorageInfo* vstorage,
SuperVersion* sv); SuperVersion* sv);
void ResetIncompleteIterators(); void ResetIncompleteIterators();
void SeekInternal(const Slice& internal_key, bool seek_to_first); void SeekInternal(const Slice& internal_key, bool seek_to_first,
bool seek_after_async_io);
void UpdateCurrent(); void UpdateCurrent();
bool NeedToSeekImmutable(const Slice& internal_key); bool NeedToSeekImmutable(const Slice& internal_key);
void DeleteCurrentIter(); void DeleteCurrentIter();

Write Preview
Loading…
Cancel
Save