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110 lignes
3.3 KiB
110 lignes
3.3 KiB
// Copyright (c) 2013 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "gtest/gtest.h"
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#include "db/db_impl.h"
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#include "leveldb/cache.h"
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#include "leveldb/db.h"
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#include "util/testutil.h"
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namespace leveldb {
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class AutoCompactTest : public testing::Test {
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public:
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AutoCompactTest() {
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dbname_ = testing::TempDir() + "autocompact_test";
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tiny_cache_ = NewLRUCache(100);
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options_.block_cache = tiny_cache_;
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DestroyDB(dbname_, options_);
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options_.create_if_missing = true;
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options_.compression = kNoCompression;
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EXPECT_LEVELDB_OK(DB::Open(options_, dbname_, &db_));
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}
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~AutoCompactTest() {
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delete db_;
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DestroyDB(dbname_, Options());
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delete tiny_cache_;
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}
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std::string Key(int i) {
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char buf[100];
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std::snprintf(buf, sizeof(buf), "key%06d", i);
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return std::string(buf);
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}
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uint64_t Size(const Slice& start, const Slice& limit) {
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Range r(start, limit);
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uint64_t size;
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db_->GetApproximateSizes(&r, 1, &size);
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return size;
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}
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void DoReads(int n);
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private:
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std::string dbname_;
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Cache* tiny_cache_;
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Options options_;
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DB* db_;
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};
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static const int kValueSize = 200 * 1024;
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static const int kTotalSize = 100 * 1024 * 1024;
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static const int kCount = kTotalSize / kValueSize;
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// Read through the first n keys repeatedly and check that they get
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// compacted (verified by checking the size of the key space).
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void AutoCompactTest::DoReads(int n) {
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std::string value(kValueSize, 'x');
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DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
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// Fill database
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for (int i = 0; i < kCount; i++) {
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ASSERT_LEVELDB_OK(db_->Put(WriteOptions(), Key(i), value));
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}
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ASSERT_LEVELDB_OK(dbi->TEST_CompactMemTable());
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// Delete everything
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for (int i = 0; i < kCount; i++) {
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ASSERT_LEVELDB_OK(db_->Delete(WriteOptions(), Key(i)));
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}
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ASSERT_LEVELDB_OK(dbi->TEST_CompactMemTable());
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// Get initial measurement of the space we will be reading.
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const int64_t initial_size = Size(Key(0), Key(n));
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const int64_t initial_other_size = Size(Key(n), Key(kCount));
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// Read until size drops significantly.
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std::string limit_key = Key(n);
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for (int read = 0; true; read++) {
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ASSERT_LT(read, 100) << "Taking too long to compact";
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Iterator* iter = db_->NewIterator(ReadOptions());
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for (iter->SeekToFirst();
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iter->Valid() && iter->key().ToString() < limit_key; iter->Next()) {
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// Drop data
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}
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delete iter;
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// Wait a little bit to allow any triggered compactions to complete.
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Env::Default()->SleepForMicroseconds(1000000);
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uint64_t size = Size(Key(0), Key(n));
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std::fprintf(stderr, "iter %3d => %7.3f MB [other %7.3f MB]\n", read + 1,
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size / 1048576.0, Size(Key(n), Key(kCount)) / 1048576.0);
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if (size <= initial_size / 10) {
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break;
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}
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}
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// Verify that the size of the key space not touched by the reads
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// is pretty much unchanged.
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const int64_t final_other_size = Size(Key(n), Key(kCount));
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ASSERT_LE(final_other_size, initial_other_size + 1048576);
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ASSERT_GE(final_other_size, initial_other_size / 5 - 1048576);
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}
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TEST_F(AutoCompactTest, ReadAll) { DoReads(kCount); }
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TEST_F(AutoCompactTest, ReadHalf) { DoReads(kCount / 2); }
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} // namespace leveldb
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