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// Copyright (c) 2011-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).
//
// Test for issue 178: a manual compaction causes deleted data to reappear.
#include <iostream>
#include <sstream>
#include <cstdlib>
#include "port/port.h"
#include "rocksdb/compaction_filter.h"
#include "rocksdb/db.h"
#include "rocksdb/slice.h"
#include "rocksdb/write_batch.h"
#include "test_util/testharness.h"
using namespace ROCKSDB_NAMESPACE;
namespace {
// Reasoning: previously the number was 1100000. Since the keys are written to
// the batch in one write each write will result into one SST file. each write
// will result into one SST file. We reduced the write_buffer_size to 1K to
// basically have the same effect with however less number of keys, which
// results into less test runtime.
const int kNumKeys = 1100;
std::string Key1(int i) {
char buf[100];
snprintf(buf, sizeof(buf), "my_key_%d", i);
return buf;
}
std::string Key2(int i) {
return Key1(i) + "_xxx";
}
class ManualCompactionTest : public testing::Test {
public:
ManualCompactionTest() {
// Get rid of any state from an old run.
dbname_ = ROCKSDB_NAMESPACE::test::PerThreadDBPath("rocksdb_cbug_test");
DestroyDB(dbname_, ROCKSDB_NAMESPACE::Options());
}
std::string dbname_;
};
class DestroyAllCompactionFilter : public CompactionFilter {
public:
DestroyAllCompactionFilter() {}
bool Filter(int /*level*/, const Slice& /*key*/, const Slice& existing_value,
std::string* /*new_value*/,
bool* /*value_changed*/) const override {
return existing_value.ToString() == "destroy";
}
const char* Name() const override { return "DestroyAllCompactionFilter"; }
};
TEST_F(ManualCompactionTest, CompactTouchesAllKeys) {
for (int iter = 0; iter < 2; ++iter) {
DB* db;
Options options;
if (iter == 0) { // level compaction
options.num_levels = 3;
options.compaction_style = kCompactionStyleLevel;
} else { // universal compaction
options.compaction_style = kCompactionStyleUniversal;
}
options.create_if_missing = true;
options.compression = ROCKSDB_NAMESPACE::kNoCompression;
options.compaction_filter = new DestroyAllCompactionFilter();
ASSERT_OK(DB::Open(options, dbname_, &db));
db->Put(WriteOptions(), Slice("key1"), Slice("destroy"));
db->Put(WriteOptions(), Slice("key2"), Slice("destroy"));
db->Put(WriteOptions(), Slice("key3"), Slice("value3"));
db->Put(WriteOptions(), Slice("key4"), Slice("destroy"));
Slice key4("key4");
db->CompactRange(CompactRangeOptions(), nullptr, &key4);
Iterator* itr = db->NewIterator(ReadOptions());
itr->SeekToFirst();
ASSERT_TRUE(itr->Valid());
ASSERT_EQ("key3", itr->key().ToString());
itr->Next();
ASSERT_TRUE(!itr->Valid());
delete itr;
delete options.compaction_filter;
delete db;
DestroyDB(dbname_, options);
}
}
TEST_F(ManualCompactionTest, Test) {
// Open database. Disable compression since it affects the creation
// of layers and the code below is trying to test against a very
// specific scenario.
ROCKSDB_NAMESPACE::DB* db;
ROCKSDB_NAMESPACE::Options db_options;
db_options.write_buffer_size = 1024;
db_options.create_if_missing = true;
db_options.compression = ROCKSDB_NAMESPACE::kNoCompression;
ASSERT_OK(ROCKSDB_NAMESPACE::DB::Open(db_options, dbname_, &db));
// create first key range
ROCKSDB_NAMESPACE::WriteBatch batch;
for (int i = 0; i < kNumKeys; i++) {
batch.Put(Key1(i), "value for range 1 key");
}
ASSERT_OK(db->Write(ROCKSDB_NAMESPACE::WriteOptions(), &batch));
// create second key range
batch.Clear();
for (int i = 0; i < kNumKeys; i++) {
batch.Put(Key2(i), "value for range 2 key");
}
ASSERT_OK(db->Write(ROCKSDB_NAMESPACE::WriteOptions(), &batch));
// delete second key range
batch.Clear();
for (int i = 0; i < kNumKeys; i++) {
batch.Delete(Key2(i));
}
ASSERT_OK(db->Write(ROCKSDB_NAMESPACE::WriteOptions(), &batch));
// compact database
std::string start_key = Key1(0);
std::string end_key = Key1(kNumKeys - 1);
ROCKSDB_NAMESPACE::Slice least(start_key.data(), start_key.size());
ROCKSDB_NAMESPACE::Slice greatest(end_key.data(), end_key.size());
// commenting out the line below causes the example to work correctly
db->CompactRange(CompactRangeOptions(), &least, &greatest);
// count the keys
ROCKSDB_NAMESPACE::Iterator* iter =
db->NewIterator(ROCKSDB_NAMESPACE::ReadOptions());
int num_keys = 0;
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
num_keys++;
}
delete iter;
ASSERT_EQ(kNumKeys, num_keys) << "Bad number of keys";
// close database
delete db;
DestroyDB(dbname_, ROCKSDB_NAMESPACE::Options());
}
} // anonymous namespace
int main(int argc, char** argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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