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// Copyright (c) 2018-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#include "db/db_test_util.h"
#include "port/stack_trace.h"
#include "rocksdb/perf_context.h"
#include "rocksdb/utilities/debug.h"
#include "table/block_based/block_builder.h"
#include "test_util/fault_injection_test_env.h"
#if !defined(ROCKSDB_LITE)
#include "test_util/sync_point.h"
#endif
#include "rocksdb/merge_operator.h"
#include "utilities/merge_operators.h"
#include "utilities/merge_operators/sortlist.h"
#include "utilities/merge_operators/string_append/stringappend2.h"
namespace ROCKSDB_NAMESPACE {
class DBMergeOperandTest : public DBTestBase {
public:
DBMergeOperandTest() : DBTestBase("/db_merge_operand_test") {}
};
TEST_F(DBMergeOperandTest, GetMergeOperandsBasic) {
class LimitedStringAppendMergeOp : public StringAppendTESTOperator {
public:
LimitedStringAppendMergeOp(int limit, char delim)
: StringAppendTESTOperator(delim), limit_(limit) {}
const char* Name() const override {
return "DBMergeOperatorTest::LimitedStringAppendMergeOp";
}
bool ShouldMerge(const std::vector<Slice>& operands) const override {
if (operands.size() > 0 && limit_ > 0 && operands.size() >= limit_) {
return true;
}
return false;
}
private:
size_t limit_ = 0;
};
Options options;
options.create_if_missing = true;
// Use only the latest two merge operands.
options.merge_operator = std::make_shared<LimitedStringAppendMergeOp>(2, ',');
options.env = env_;
Reopen(options);
int num_records = 4;
int number_of_operands = 0;
std::vector<PinnableSlice> values(num_records);
GetMergeOperandsOptions merge_operands_info;
merge_operands_info.expected_max_number_of_operands = num_records;
// k0 value in memtable
Put("k0", "PutARock");
db_->GetMergeOperands(ReadOptions(), db_->DefaultColumnFamily(), "k0",
values.data(), &merge_operands_info,
&number_of_operands);
ASSERT_EQ(values[0], "PutARock");
// k0.1 value in SST
Put("k0.1", "RockInSST");
ASSERT_OK(Flush());
db_->GetMergeOperands(ReadOptions(), db_->DefaultColumnFamily(), "k0.1",
values.data(), &merge_operands_info,
&number_of_operands);
ASSERT_EQ(values[0], "RockInSST");
// All k1 values are in memtable.
ASSERT_OK(Merge("k1", "a"));
Put("k1", "x");
ASSERT_OK(Merge("k1", "b"));
ASSERT_OK(Merge("k1", "c"));
ASSERT_OK(Merge("k1", "d"));
db_->GetMergeOperands(ReadOptions(), db_->DefaultColumnFamily(), "k1",
values.data(), &merge_operands_info,
&number_of_operands);
ASSERT_EQ(values[0], "x");
ASSERT_EQ(values[1], "b");
ASSERT_EQ(values[2], "c");
ASSERT_EQ(values[3], "d");
// expected_max_number_of_operands is less than number of merge operands so
// status should be Incomplete.
merge_operands_info.expected_max_number_of_operands = num_records - 1;
Status status = db_->GetMergeOperands(
ReadOptions(), db_->DefaultColumnFamily(), "k1", values.data(),
&merge_operands_info, &number_of_operands);
ASSERT_EQ(status.IsIncomplete(), true);
merge_operands_info.expected_max_number_of_operands = num_records;
// All k1.1 values are in memtable.
ASSERT_OK(Merge("k1.1", "r"));
Delete("k1.1");
ASSERT_OK(Merge("k1.1", "c"));
ASSERT_OK(Merge("k1.1", "k"));
ASSERT_OK(Merge("k1.1", "s"));
db_->GetMergeOperands(ReadOptions(), db_->DefaultColumnFamily(), "k1.1",
values.data(), &merge_operands_info,
&number_of_operands);
ASSERT_EQ(values[0], "c");
ASSERT_EQ(values[1], "k");
ASSERT_EQ(values[2], "s");
// All k2 values are flushed to L0 into a single file.
ASSERT_OK(Merge("k2", "q"));
ASSERT_OK(Merge("k2", "w"));
ASSERT_OK(Merge("k2", "e"));
ASSERT_OK(Merge("k2", "r"));
ASSERT_OK(Flush());
db_->GetMergeOperands(ReadOptions(), db_->DefaultColumnFamily(), "k2",
values.data(), &merge_operands_info,
&number_of_operands);
ASSERT_EQ(values[0], "q");
ASSERT_EQ(values[1], "w");
ASSERT_EQ(values[2], "e");
ASSERT_EQ(values[3], "r");
// All k2.1 values are flushed to L0 into a single file.
ASSERT_OK(Merge("k2.1", "m"));
Put("k2.1", "l");
ASSERT_OK(Merge("k2.1", "n"));
ASSERT_OK(Merge("k2.1", "o"));
ASSERT_OK(Flush());
db_->GetMergeOperands(ReadOptions(), db_->DefaultColumnFamily(), "k2.1",
values.data(), &merge_operands_info,
&number_of_operands);
ASSERT_EQ(values[0], "l,n,o");
// All k2.2 values are flushed to L0 into a single file.
ASSERT_OK(Merge("k2.2", "g"));
Delete("k2.2");
ASSERT_OK(Merge("k2.2", "o"));
ASSERT_OK(Merge("k2.2", "t"));
ASSERT_OK(Flush());
db_->GetMergeOperands(ReadOptions(), db_->DefaultColumnFamily(), "k2.2",
values.data(), &merge_operands_info,
&number_of_operands);
ASSERT_EQ(values[0], "o,t");
// Do some compaction that will make the following tests more predictable
// Slice start("PutARock");
// Slice end("t");
db_->CompactRange(CompactRangeOptions(), nullptr, nullptr);
// All k3 values are flushed and are in different files.
ASSERT_OK(Merge("k3", "ab"));
ASSERT_OK(Flush());
ASSERT_OK(Merge("k3", "bc"));
ASSERT_OK(Flush());
ASSERT_OK(Merge("k3", "cd"));
ASSERT_OK(Flush());
ASSERT_OK(Merge("k3", "de"));
db_->GetMergeOperands(ReadOptions(), db_->DefaultColumnFamily(), "k3",
values.data(), &merge_operands_info,
&number_of_operands);
ASSERT_EQ(values[0], "ab");
ASSERT_EQ(values[1], "bc");
ASSERT_EQ(values[2], "cd");
ASSERT_EQ(values[3], "de");
// All k3.1 values are flushed and are in different files.
ASSERT_OK(Merge("k3.1", "ab"));
ASSERT_OK(Flush());
Put("k3.1", "bc");
ASSERT_OK(Flush());
ASSERT_OK(Merge("k3.1", "cd"));
ASSERT_OK(Flush());
ASSERT_OK(Merge("k3.1", "de"));
db_->GetMergeOperands(ReadOptions(), db_->DefaultColumnFamily(), "k3.1",
values.data(), &merge_operands_info,
&number_of_operands);
ASSERT_EQ(values[0], "bc");
ASSERT_EQ(values[1], "cd");
ASSERT_EQ(values[2], "de");
// All k3.2 values are flushed and are in different files.
ASSERT_OK(Merge("k3.2", "ab"));
ASSERT_OK(Flush());
Delete("k3.2");
ASSERT_OK(Flush());
ASSERT_OK(Merge("k3.2", "cd"));
ASSERT_OK(Flush());
ASSERT_OK(Merge("k3.2", "de"));
db_->GetMergeOperands(ReadOptions(), db_->DefaultColumnFamily(), "k3.2",
values.data(), &merge_operands_info,
&number_of_operands);
ASSERT_EQ(values[0], "cd");
ASSERT_EQ(values[1], "de");
// All K4 values are in different levels
ASSERT_OK(Merge("k4", "ba"));
ASSERT_OK(Flush());
MoveFilesToLevel(4);
ASSERT_OK(Merge("k4", "cb"));
ASSERT_OK(Flush());
MoveFilesToLevel(3);
ASSERT_OK(Merge("k4", "dc"));
ASSERT_OK(Flush());
MoveFilesToLevel(1);
ASSERT_OK(Merge("k4", "ed"));
db_->GetMergeOperands(ReadOptions(), db_->DefaultColumnFamily(), "k4",
values.data(), &merge_operands_info,
&number_of_operands);
ASSERT_EQ(values[0], "ba");
ASSERT_EQ(values[1], "cb");
ASSERT_EQ(values[2], "dc");
ASSERT_EQ(values[3], "ed");
// First 3 k5 values are in SST and next 4 k5 values are in Immutable Memtable
ASSERT_OK(Merge("k5", "who"));
ASSERT_OK(Merge("k5", "am"));
ASSERT_OK(Merge("k5", "i"));
ASSERT_OK(Flush());
Put("k5", "remember");
ASSERT_OK(Merge("k5", "i"));
ASSERT_OK(Merge("k5", "am"));
ASSERT_OK(Merge("k5", "rocks"));
dbfull()->TEST_SwitchMemtable();
db_->GetMergeOperands(ReadOptions(), db_->DefaultColumnFamily(), "k5",
values.data(), &merge_operands_info,
&number_of_operands);
ASSERT_EQ(values[0], "remember");
ASSERT_EQ(values[1], "i");
ASSERT_EQ(values[2], "am");
}
} // namespace ROCKSDB_NAMESPACE
int main(int argc, char** argv) {
ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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