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A few more tests, a fix, and a perf improvement

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This commit is contained in:
anand76 2022-05-11 23:43:57 -07:00
parent 2a2b36afcc
commit 7c6d3fddec
4 changed files with 288 additions and 6 deletions
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255
db/db_basic_test.cc
View File

@ -12,6 +12,7 @@
#include "db/db_test_util.h"
#include "options/options_helper.h"
#include "port/stack_trace.h"
#include "rocksdb/filter_policy.h"
#include "rocksdb/flush_block_policy.h"
#include "rocksdb/merge_operator.h"
#include "rocksdb/perf_context.h"
@ -2066,6 +2067,220 @@ TEST_P(DBMultiGetTestWithParam, MultiGetBatchedValueSizeMultiLevelMerge) {
INSTANTIATE_TEST_CASE_P(DBMultiGetTestWithParam, DBMultiGetTestWithParam,
testing::Combine(testing::Bool(), testing::Bool()));
#if USE_COROUTINES
class DBMultiGetAsyncIOTest : public DBBasicTest {
public:
DBMultiGetAsyncIOTest()
: DBBasicTest(), statistics_(ROCKSDB_NAMESPACE::CreateDBStatistics()) {
BlockBasedTableOptions bbto;
bbto.filter_policy.reset(NewBloomFilterPolicy(10));
Options options = CurrentOptions();
options.disable_auto_compactions = true;
options.statistics = statistics_;
options.table_factory.reset(NewBlockBasedTableFactory(bbto));
Reopen(options);
int num_keys = 0;
// Put all keys in the bottommost level, and overwrite some keys
// in L0 and L1
for (int i = 0; i < 128; ++i) {
EXPECT_OK(Put(Key(i), "val_l2_" + std::to_string(i)));
num_keys++;
if (num_keys == 8) {
EXPECT_OK(Flush());
num_keys = 0;
}
}
if (num_keys > 0) {
EXPECT_OK(Flush());
num_keys = 0;
}
MoveFilesToLevel(2);
for (int i = 0; i < 128; i += 3) {
EXPECT_OK(Put(Key(i), "val_l1_" + std::to_string(i)));
num_keys++;
if (num_keys == 8) {
EXPECT_OK(Flush());
num_keys = 0;
}
}
if (num_keys > 0) {
EXPECT_OK(Flush());
num_keys = 0;
}
MoveFilesToLevel(1);
for (int i = 0; i < 128; i += 5) {
EXPECT_OK(Put(Key(i), "val_l0_" + std::to_string(i)));
num_keys++;
if (num_keys == 8) {
EXPECT_OK(Flush());
num_keys = 0;
}
}
if (num_keys > 0) {
EXPECT_OK(Flush());
num_keys = 0;
}
EXPECT_EQ(0, num_keys);
}
const std::shared_ptr<Statistics>& statistics() { return statistics_; }
private:
std::shared_ptr<Statistics> statistics_;
};
TEST_F(DBMultiGetAsyncIOTest, GetFromL0) {
std::vector<std::string> key_strs;
std::vector<Slice> keys;
std::vector<PinnableSlice> values;
std::vector<Status> statuses;
// All 3 keys in L0. The L0 files should be read serially.
key_strs.push_back(Key(0));
key_strs.push_back(Key(40));
key_strs.push_back(Key(80));
keys.push_back(key_strs[0]);
keys.push_back(key_strs[1]);
keys.push_back(key_strs[2]);
values.resize(keys.size());
statuses.resize(keys.size());
ReadOptions ro;
ro.async_io = true;
dbfull()->MultiGet(ro, dbfull()->DefaultColumnFamily(), keys.size(),
keys.data(), values.data(), statuses.data());
ASSERT_EQ(values.size(), 3);
ASSERT_EQ(values[0], "val_l0_" + std::to_string(0));
ASSERT_EQ(values[1], "val_l0_" + std::to_string(40));
ASSERT_EQ(values[2], "val_l0_" + std::to_string(80));
HistogramData multiget_io_batch_size;
statistics()->histogramData(MULTIGET_IO_BATCH_SIZE, &multiget_io_batch_size);
// No async IO in this case since we don't do parallel lookup in L0
ASSERT_EQ(multiget_io_batch_size.count, 0);
ASSERT_EQ(multiget_io_batch_size.max, 0);
}
TEST_F(DBMultiGetAsyncIOTest, GetFromL1) {
std::vector<std::string> key_strs;
std::vector<Slice> keys;
std::vector<PinnableSlice> values;
std::vector<Status> statuses;
key_strs.push_back(Key(33));
key_strs.push_back(Key(54));
key_strs.push_back(Key(102));
keys.push_back(key_strs[0]);
keys.push_back(key_strs[1]);
keys.push_back(key_strs[2]);
values.resize(keys.size());
statuses.resize(keys.size());
ReadOptions ro;
ro.async_io = true;
dbfull()->MultiGet(ro, dbfull()->DefaultColumnFamily(), keys.size(),
keys.data(), values.data(), statuses.data());
ASSERT_EQ(values.size(), 3);
ASSERT_EQ(statuses[0], Status::OK());
ASSERT_EQ(statuses[1], Status::OK());
ASSERT_EQ(statuses[2], Status::OK());
ASSERT_EQ(values[0], "val_l1_" + std::to_string(33));
ASSERT_EQ(values[1], "val_l1_" + std::to_string(54));
ASSERT_EQ(values[2], "val_l1_" + std::to_string(102));
HistogramData multiget_io_batch_size;
statistics()->histogramData(MULTIGET_IO_BATCH_SIZE, &multiget_io_batch_size);
// A batch of 3 async IOs is expected, one for each overlapping file in L1
ASSERT_EQ(multiget_io_batch_size.count, 1);
ASSERT_EQ(multiget_io_batch_size.max, 3);
}
TEST_F(DBMultiGetAsyncIOTest, LastKeyInFile) {
std::vector<std::string> key_strs;
std::vector<Slice> keys;
std::vector<PinnableSlice> values;
std::vector<Status> statuses;
// 24 is the last key in the first L1 file
key_strs.push_back(Key(21));
key_strs.push_back(Key(54));
key_strs.push_back(Key(102));
keys.push_back(key_strs[0]);
keys.push_back(key_strs[1]);
keys.push_back(key_strs[2]);
values.resize(keys.size());
statuses.resize(keys.size());
ReadOptions ro;
ro.async_io = true;
dbfull()->MultiGet(ro, dbfull()->DefaultColumnFamily(), keys.size(),
keys.data(), values.data(), statuses.data());
ASSERT_EQ(values.size(), 3);
ASSERT_EQ(statuses[0], Status::OK());
ASSERT_EQ(statuses[1], Status::OK());
ASSERT_EQ(statuses[2], Status::OK());
ASSERT_EQ(values[0], "val_l1_" + std::to_string(21));
ASSERT_EQ(values[1], "val_l1_" + std::to_string(54));
ASSERT_EQ(values[2], "val_l1_" + std::to_string(102));
HistogramData multiget_io_batch_size;
statistics()->histogramData(MULTIGET_IO_BATCH_SIZE, &multiget_io_batch_size);
// Since the first MultiGet key is the last key in a file, the MultiGet is
// expected to lookup in that file first, before moving on to other files.
// So the first file lookup will issue one async read, and the next lookup
// will lookup 2 files in parallel and issue 2 async reads
ASSERT_EQ(multiget_io_batch_size.count, 2);
ASSERT_EQ(multiget_io_batch_size.max, 2);
}
TEST_F(DBMultiGetAsyncIOTest, GetFromL1AndL2) {
std::vector<std::string> key_strs;
std::vector<Slice> keys;
std::vector<PinnableSlice> values;
std::vector<Status> statuses;
// 33 and 102 are in L1, and 56 is in L2
key_strs.push_back(Key(33));
key_strs.push_back(Key(56));
key_strs.push_back(Key(102));
keys.push_back(key_strs[0]);
keys.push_back(key_strs[1]);
keys.push_back(key_strs[2]);
values.resize(keys.size());
statuses.resize(keys.size());
ReadOptions ro;
ro.async_io = true;
dbfull()->MultiGet(ro, dbfull()->DefaultColumnFamily(), keys.size(),
keys.data(), values.data(), statuses.data());
ASSERT_EQ(values.size(), 3);
ASSERT_EQ(statuses[0], Status::OK());
ASSERT_EQ(statuses[1], Status::OK());
ASSERT_EQ(statuses[2], Status::OK());
ASSERT_EQ(values[0], "val_l1_" + std::to_string(33));
ASSERT_EQ(values[1], "val_l2_" + std::to_string(56));
ASSERT_EQ(values[2], "val_l1_" + std::to_string(102));
HistogramData multiget_io_batch_size;
statistics()->histogramData(MULTIGET_IO_BATCH_SIZE, &multiget_io_batch_size);
// There is only one MultiGet key in the bottommost level - 56. Thus
// the bottommost level will not use async IO.
ASSERT_EQ(multiget_io_batch_size.count, 1);
ASSERT_EQ(multiget_io_batch_size.max, 2);
}
#endif // USE_COROUTINES
TEST_F(DBBasicTest, MultiGetStats) {
Options options;
options.create_if_missing = true;
@ -3435,6 +3650,11 @@ class DeadlineRandomAccessFile : public FSRandomAccessFileOwnerWrapper {
IOStatus MultiRead(FSReadRequest* reqs, size_t num_reqs,
const IOOptions& options, IODebugContext* dbg) override;
IOStatus ReadAsync(FSReadRequest& req, const IOOptions& opts,
std::function<void(const FSReadRequest&, void*)> cb,
void* cb_arg, void** io_handle, IOHandleDeleter* del_fn,
IODebugContext* dbg) override;
private:
DeadlineFS& fs_;
std::unique_ptr<FSRandomAccessFile> file_;
@ -3575,6 +3795,26 @@ IOStatus DeadlineRandomAccessFile::Read(uint64_t offset, size_t len,
return s;
}
IOStatus DeadlineRandomAccessFile::ReadAsync(
FSReadRequest& req, const IOOptions& opts,
std::function<void(const FSReadRequest&, void*)> cb, void* cb_arg,
void** io_handle, IOHandleDeleter* del_fn, IODebugContext* dbg) {
const std::chrono::microseconds deadline = fs_.GetDeadline();
const std::chrono::microseconds io_timeout = fs_.GetIOTimeout();
IOStatus s;
if (deadline.count() || io_timeout.count()) {
fs_.AssertDeadline(deadline, io_timeout, opts);
}
if (s.ok()) {
s = FSRandomAccessFileWrapper::ReadAsync(req, opts, cb, cb_arg, io_handle,
del_fn, dbg);
}
if (s.ok()) {
s = fs_.ShouldDelay(opts);
}
return s;
}
IOStatus DeadlineRandomAccessFile::MultiRead(FSReadRequest* reqs,
size_t num_reqs,
const IOOptions& options,
@ -3596,7 +3836,8 @@ IOStatus DeadlineRandomAccessFile::MultiRead(FSReadRequest* reqs,
// A test class for intercepting random reads and injecting artificial
// delays. Used for testing the MultiGet deadline feature
class DBBasicTestMultiGetDeadline : public DBBasicTestMultiGet {
class DBBasicTestMultiGetDeadline : public DBBasicTestMultiGet,
public testing::WithParamInterface<bool> {
public:
DBBasicTestMultiGetDeadline()
: DBBasicTestMultiGet(
@ -3619,7 +3860,13 @@ class DBBasicTestMultiGetDeadline : public DBBasicTestMultiGet {
}
};
TEST_F(DBBasicTestMultiGetDeadline, MultiGetDeadlineExceeded) {
TEST_P(DBBasicTestMultiGetDeadline, MultiGetDeadlineExceeded) {
#ifndef USE_COROUTINES
if (GetParam()) {
ROCKSDB_GTEST_SKIP("This test requires coroutine support");
return;
}
#endif // USE_COROUTINES
std::shared_ptr<DeadlineFS> fs = std::make_shared<DeadlineFS>(env_, false);
std::unique_ptr<Env> env(new CompositeEnvWrapper(env_, fs));
Options options = CurrentOptions();
@ -3650,6 +3897,7 @@ TEST_F(DBBasicTestMultiGetDeadline, MultiGetDeadlineExceeded) {
ReadOptions ro;
ro.deadline = std::chrono::microseconds{env->NowMicros() + 10000};
ro.async_io = GetParam();
// Delay the first IO
fs->SetDelayTrigger(ro.deadline, ro.io_timeout, 0);
@ -3752,6 +4000,9 @@ TEST_F(DBBasicTestMultiGetDeadline, MultiGetDeadlineExceeded) {
Close();
}
INSTANTIATE_TEST_CASE_P(DeadlineIO, DBBasicTestMultiGetDeadline,
::testing::Bool());
TEST_F(DBBasicTest, ManifestWriteFailure) {
Options options = GetDefaultOptions();
options.create_if_missing = true;

6
db/version_set.cc
View File

@ -592,6 +592,10 @@ class FilePickerMultiGet {
const MultiGetRange& CurrentFileRange() { return current_file_range_; }
bool RemainingOverlapInLevel() {
return !current_level_range_.Suffix(current_file_range_).empty();
}
private:
unsigned int num_levels_;
unsigned int curr_level_;
@ -2231,7 +2235,7 @@ void Version::MultiGet(const ReadOptions& read_options, MultiGetRange* range,
// L0 files won't be parallelized anyway. The regular synchronous version
// is faster.
if (!read_options.async_io || !using_coroutines() ||
fp.GetHitFileLevel() == 0) {
fp.GetHitFileLevel() == 0 || !fp.RemainingOverlapInLevel()) {
if (f) {
// Call MultiGetFromSST for looking up a single file
s = MultiGetFromSST(read_options, fp.CurrentFileRange(),

21
table/multiget_context.h
View File

@ -290,6 +290,18 @@ class MultiGetContext {
MultiGetContext* context() const { return ctx_; }
Range Suffix(const Range& other) const {
size_t other_last = other.FindLastRemaining();
size_t my_last = FindLastRemaining();
if (my_last > other_last) {
return Range(*this, Iterator(this, other_last),
Iterator(this, my_last));
} else {
return Range(*this, begin(), begin());
}
}
private:
friend MultiGetContext;
MultiGetContext* ctx_;
@ -306,6 +318,15 @@ class MultiGetContext {
return (((Mask{1} << end_) - 1) & ~((Mask{1} << start_) - 1) &
~(ctx_->value_mask_ | skip_mask_));
}
size_t FindLastRemaining() const {
Mask mask = RemainingMask();
size_t index = (mask >>= start_) ? start_ : 0;
while (mask >>= 1) {
index++;
}
return index;
}
};
// Return the initial range that encompasses all the keys in the batch

8
util/async_file_reader.cc
View File

@ -19,6 +19,8 @@ bool AsyncFileReader::MultiReadAsyncImpl(ReadAwaiter* awaiter) {
awaiter->io_handle_.resize(awaiter->num_reqs_);
awaiter->del_fn_.resize(awaiter->num_reqs_);
for (size_t i = 0; i < awaiter->num_reqs_; ++i) {
awaiter->io_handle_.push_back(nullptr);
awaiter->del_fn_.push_back(nullptr);
awaiter->file_
->ReadAsync(
awaiter->read_reqs_[i], awaiter->opts_,
@ -44,10 +46,12 @@ void AsyncFileReader::Poll() {
waiter = head_;
do {
for (size_t i = 0; i < waiter->num_reqs_; ++i) {
if (waiter->io_handle_[i]) {
io_handles.push_back(waiter->io_handle_[i]);
}
}
} while (waiter != tail_ && (waiter = waiter->next_));
{
if (io_handles.size() > 0) {
StopWatch sw(SystemClock::Default().get(), stats_, POLL_WAIT_MICROS);
fs_->Poll(io_handles, io_handles.size()).PermitUncheckedError();
}
@ -56,8 +60,10 @@ void AsyncFileReader::Poll() {
head_ = waiter->next_;
for (size_t i = 0; i < waiter->num_reqs_; ++i) {
if (waiter->io_handle_[i] && waiter->del_fn_[i]) {
waiter->del_fn_[i](waiter->io_handle_[i]);
}
}
waiter->awaiting_coro_.resume();
} while (waiter != tail_);
head_ = tail_ = nullptr;