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829 wiersze
24 KiB
829 wiersze
24 KiB
// Copyright (c) 2011 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 "leveldb/table.h"
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#include <map>
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#include <string>
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#include "gtest/gtest.h"
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#include "db/dbformat.h"
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#include "db/memtable.h"
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#include "db/write_batch_internal.h"
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#include "leveldb/db.h"
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#include "leveldb/env.h"
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#include "leveldb/iterator.h"
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#include "leveldb/table_builder.h"
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#include "table/block.h"
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#include "table/block_builder.h"
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#include "table/format.h"
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#include "util/random.h"
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#include "util/testutil.h"
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namespace leveldb {
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// Return reverse of "key".
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// Used to test non-lexicographic comparators.
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static std::string Reverse(const Slice& key) {
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std::string str(key.ToString());
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std::string rev("");
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for (std::string::reverse_iterator rit = str.rbegin(); rit != str.rend();
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++rit) {
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rev.push_back(*rit);
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}
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return rev;
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}
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namespace {
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class ReverseKeyComparator : public Comparator {
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public:
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const char* Name() const override {
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return "leveldb.ReverseBytewiseComparator";
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}
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int Compare(const Slice& a, const Slice& b) const override {
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return BytewiseComparator()->Compare(Reverse(a), Reverse(b));
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}
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void FindShortestSeparator(std::string* start,
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const Slice& limit) const override {
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std::string s = Reverse(*start);
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std::string l = Reverse(limit);
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BytewiseComparator()->FindShortestSeparator(&s, l);
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*start = Reverse(s);
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}
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void FindShortSuccessor(std::string* key) const override {
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std::string s = Reverse(*key);
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BytewiseComparator()->FindShortSuccessor(&s);
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*key = Reverse(s);
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}
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};
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} // namespace
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static ReverseKeyComparator reverse_key_comparator;
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static void Increment(const Comparator* cmp, std::string* key) {
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if (cmp == BytewiseComparator()) {
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key->push_back('\0');
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} else {
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assert(cmp == &reverse_key_comparator);
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std::string rev = Reverse(*key);
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rev.push_back('\0');
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*key = Reverse(rev);
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}
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}
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// An STL comparator that uses a Comparator
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namespace {
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struct STLLessThan {
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const Comparator* cmp;
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STLLessThan() : cmp(BytewiseComparator()) {}
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STLLessThan(const Comparator* c) : cmp(c) {}
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bool operator()(const std::string& a, const std::string& b) const {
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return cmp->Compare(Slice(a), Slice(b)) < 0;
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}
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};
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} // namespace
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class StringSink : public WritableFile {
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public:
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~StringSink() override = default;
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const std::string& contents() const { return contents_; }
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Status Close() override { return Status::OK(); }
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Status Flush() override { return Status::OK(); }
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Status Sync() override { return Status::OK(); }
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Status Append(const Slice& data) override {
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contents_.append(data.data(), data.size());
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return Status::OK();
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}
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private:
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std::string contents_;
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};
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class StringSource : public RandomAccessFile {
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public:
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StringSource(const Slice& contents)
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: contents_(contents.data(), contents.size()) {}
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~StringSource() override = default;
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uint64_t Size() const { return contents_.size(); }
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Status Read(uint64_t offset, size_t n, Slice* result,
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char* scratch) const override {
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if (offset >= contents_.size()) {
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return Status::InvalidArgument("invalid Read offset");
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}
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if (offset + n > contents_.size()) {
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n = contents_.size() - offset;
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}
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std::memcpy(scratch, &contents_[offset], n);
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*result = Slice(scratch, n);
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return Status::OK();
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}
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private:
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std::string contents_;
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};
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typedef std::map<std::string, std::string, STLLessThan> KVMap;
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// Helper class for tests to unify the interface between
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// BlockBuilder/TableBuilder and Block/Table.
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class Constructor {
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public:
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explicit Constructor(const Comparator* cmp) : data_(STLLessThan(cmp)) {}
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virtual ~Constructor() = default;
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void Add(const std::string& key, const Slice& value) {
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data_[key] = value.ToString();
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}
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// Finish constructing the data structure with all the keys that have
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// been added so far. Returns the keys in sorted order in "*keys"
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// and stores the key/value pairs in "*kvmap"
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void Finish(const Options& options, std::vector<std::string>* keys,
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KVMap* kvmap) {
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*kvmap = data_;
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keys->clear();
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for (const auto& kvp : data_) {
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keys->push_back(kvp.first);
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}
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data_.clear();
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Status s = FinishImpl(options, *kvmap);
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ASSERT_TRUE(s.ok()) << s.ToString();
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}
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// Construct the data structure from the data in "data"
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virtual Status FinishImpl(const Options& options, const KVMap& data) = 0;
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virtual Iterator* NewIterator() const = 0;
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const KVMap& data() const { return data_; }
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virtual DB* db() const { return nullptr; } // Overridden in DBConstructor
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private:
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KVMap data_;
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};
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class BlockConstructor : public Constructor {
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public:
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explicit BlockConstructor(const Comparator* cmp)
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: Constructor(cmp), comparator_(cmp), block_(nullptr) {}
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~BlockConstructor() override { delete block_; }
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Status FinishImpl(const Options& options, const KVMap& data) override {
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delete block_;
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block_ = nullptr;
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BlockBuilder builder(&options);
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for (const auto& kvp : data) {
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builder.Add(kvp.first, kvp.second);
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}
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// Open the block
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data_ = builder.Finish().ToString();
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BlockContents contents;
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contents.data = data_;
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contents.cachable = false;
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contents.heap_allocated = false;
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block_ = new Block(contents);
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return Status::OK();
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}
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Iterator* NewIterator() const override {
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return block_->NewIterator(comparator_);
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}
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private:
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const Comparator* const comparator_;
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std::string data_;
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Block* block_;
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BlockConstructor();
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};
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class TableConstructor : public Constructor {
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public:
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TableConstructor(const Comparator* cmp)
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: Constructor(cmp), source_(nullptr), table_(nullptr) {}
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~TableConstructor() override { Reset(); }
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Status FinishImpl(const Options& options, const KVMap& data) override {
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Reset();
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StringSink sink;
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TableBuilder builder(options, &sink);
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for (const auto& kvp : data) {
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builder.Add(kvp.first, kvp.second);
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EXPECT_LEVELDB_OK(builder.status());
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}
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Status s = builder.Finish();
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EXPECT_LEVELDB_OK(s);
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EXPECT_EQ(sink.contents().size(), builder.FileSize());
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// Open the table
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source_ = new StringSource(sink.contents());
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Options table_options;
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table_options.comparator = options.comparator;
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return Table::Open(table_options, source_, sink.contents().size(), &table_);
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}
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Iterator* NewIterator() const override {
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return table_->NewIterator(ReadOptions());
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}
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uint64_t ApproximateOffsetOf(const Slice& key) const {
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return table_->ApproximateOffsetOf(key);
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}
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private:
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void Reset() {
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delete table_;
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delete source_;
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table_ = nullptr;
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source_ = nullptr;
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}
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StringSource* source_;
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Table* table_;
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TableConstructor();
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};
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// A helper class that converts internal format keys into user keys
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class KeyConvertingIterator : public Iterator {
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public:
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explicit KeyConvertingIterator(Iterator* iter) : iter_(iter) {}
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KeyConvertingIterator(const KeyConvertingIterator&) = delete;
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KeyConvertingIterator& operator=(const KeyConvertingIterator&) = delete;
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~KeyConvertingIterator() override { delete iter_; }
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bool Valid() const override { return iter_->Valid(); }
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void Seek(const Slice& target) override {
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ParsedInternalKey ikey(target, kMaxSequenceNumber, kTypeValue);
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std::string encoded;
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AppendInternalKey(&encoded, ikey);
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iter_->Seek(encoded);
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}
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void SeekToFirst() override { iter_->SeekToFirst(); }
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void SeekToLast() override { iter_->SeekToLast(); }
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void Next() override { iter_->Next(); }
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void Prev() override { iter_->Prev(); }
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Slice key() const override {
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assert(Valid());
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ParsedInternalKey key;
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if (!ParseInternalKey(iter_->key(), &key)) {
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status_ = Status::Corruption("malformed internal key");
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return Slice("corrupted key");
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}
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return key.user_key;
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}
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Slice value() const override { return iter_->value(); }
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Status status() const override {
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return status_.ok() ? iter_->status() : status_;
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}
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private:
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mutable Status status_;
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Iterator* iter_;
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};
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class MemTableConstructor : public Constructor {
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public:
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explicit MemTableConstructor(const Comparator* cmp)
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: Constructor(cmp), internal_comparator_(cmp) {
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memtable_ = new MemTable(internal_comparator_);
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memtable_->Ref();
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}
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~MemTableConstructor() override { memtable_->Unref(); }
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Status FinishImpl(const Options& options, const KVMap& data) override {
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memtable_->Unref();
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memtable_ = new MemTable(internal_comparator_);
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memtable_->Ref();
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int seq = 1;
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for (const auto& kvp : data) {
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memtable_->Add(seq, kTypeValue, kvp.first, kvp.second);
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seq++;
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}
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return Status::OK();
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}
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Iterator* NewIterator() const override {
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return new KeyConvertingIterator(memtable_->NewIterator());
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}
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private:
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const InternalKeyComparator internal_comparator_;
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MemTable* memtable_;
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};
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class DBConstructor : public Constructor {
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public:
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explicit DBConstructor(const Comparator* cmp)
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: Constructor(cmp), comparator_(cmp) {
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db_ = nullptr;
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NewDB();
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}
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~DBConstructor() override { delete db_; }
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Status FinishImpl(const Options& options, const KVMap& data) override {
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delete db_;
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db_ = nullptr;
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NewDB();
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for (const auto& kvp : data) {
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WriteBatch batch;
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batch.Put(kvp.first, kvp.second);
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EXPECT_TRUE(db_->Write(WriteOptions(), &batch).ok());
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}
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return Status::OK();
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}
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Iterator* NewIterator() const override {
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return db_->NewIterator(ReadOptions());
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}
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DB* db() const override { return db_; }
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private:
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void NewDB() {
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std::string name = testing::TempDir() + "table_testdb";
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Options options;
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options.comparator = comparator_;
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Status status = DestroyDB(name, options);
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ASSERT_TRUE(status.ok()) << status.ToString();
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options.create_if_missing = true;
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options.error_if_exists = true;
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options.write_buffer_size = 10000; // Something small to force merging
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status = DB::Open(options, name, &db_);
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ASSERT_TRUE(status.ok()) << status.ToString();
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}
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const Comparator* const comparator_;
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DB* db_;
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};
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enum TestType { TABLE_TEST, BLOCK_TEST, MEMTABLE_TEST, DB_TEST };
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struct TestArgs {
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TestType type;
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bool reverse_compare;
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int restart_interval;
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};
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static const TestArgs kTestArgList[] = {
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{TABLE_TEST, false, 16},
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{TABLE_TEST, false, 1},
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{TABLE_TEST, false, 1024},
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{TABLE_TEST, true, 16},
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{TABLE_TEST, true, 1},
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{TABLE_TEST, true, 1024},
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{BLOCK_TEST, false, 16},
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{BLOCK_TEST, false, 1},
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{BLOCK_TEST, false, 1024},
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{BLOCK_TEST, true, 16},
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{BLOCK_TEST, true, 1},
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{BLOCK_TEST, true, 1024},
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// Restart interval does not matter for memtables
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{MEMTABLE_TEST, false, 16},
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{MEMTABLE_TEST, true, 16},
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// Do not bother with restart interval variations for DB
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{DB_TEST, false, 16},
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{DB_TEST, true, 16},
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};
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static const int kNumTestArgs = sizeof(kTestArgList) / sizeof(kTestArgList[0]);
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class Harness : public testing::Test {
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public:
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Harness() : constructor_(nullptr) {}
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void Init(const TestArgs& args) {
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delete constructor_;
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constructor_ = nullptr;
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options_ = Options();
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options_.block_restart_interval = args.restart_interval;
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// Use shorter block size for tests to exercise block boundary
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// conditions more.
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options_.block_size = 256;
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if (args.reverse_compare) {
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options_.comparator = &reverse_key_comparator;
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}
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switch (args.type) {
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case TABLE_TEST:
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constructor_ = new TableConstructor(options_.comparator);
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break;
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case BLOCK_TEST:
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constructor_ = new BlockConstructor(options_.comparator);
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break;
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case MEMTABLE_TEST:
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constructor_ = new MemTableConstructor(options_.comparator);
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break;
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case DB_TEST:
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constructor_ = new DBConstructor(options_.comparator);
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break;
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}
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}
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~Harness() { delete constructor_; }
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void Add(const std::string& key, const std::string& value) {
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constructor_->Add(key, value);
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}
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void Test(Random* rnd) {
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std::vector<std::string> keys;
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KVMap data;
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constructor_->Finish(options_, &keys, &data);
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TestForwardScan(keys, data);
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TestBackwardScan(keys, data);
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TestRandomAccess(rnd, keys, data);
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}
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void TestForwardScan(const std::vector<std::string>& keys,
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const KVMap& data) {
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Iterator* iter = constructor_->NewIterator();
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ASSERT_TRUE(!iter->Valid());
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iter->SeekToFirst();
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for (KVMap::const_iterator model_iter = data.begin();
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model_iter != data.end(); ++model_iter) {
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ASSERT_EQ(ToString(data, model_iter), ToString(iter));
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iter->Next();
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}
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ASSERT_TRUE(!iter->Valid());
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delete iter;
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}
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void TestBackwardScan(const std::vector<std::string>& keys,
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const KVMap& data) {
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Iterator* iter = constructor_->NewIterator();
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ASSERT_TRUE(!iter->Valid());
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iter->SeekToLast();
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for (KVMap::const_reverse_iterator model_iter = data.rbegin();
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model_iter != data.rend(); ++model_iter) {
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ASSERT_EQ(ToString(data, model_iter), ToString(iter));
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iter->Prev();
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}
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ASSERT_TRUE(!iter->Valid());
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delete iter;
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}
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void TestRandomAccess(Random* rnd, const std::vector<std::string>& keys,
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const KVMap& data) {
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static const bool kVerbose = false;
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Iterator* iter = constructor_->NewIterator();
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ASSERT_TRUE(!iter->Valid());
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KVMap::const_iterator model_iter = data.begin();
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if (kVerbose) std::fprintf(stderr, "---\n");
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for (int i = 0; i < 200; i++) {
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const int toss = rnd->Uniform(5);
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switch (toss) {
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case 0: {
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if (iter->Valid()) {
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if (kVerbose) std::fprintf(stderr, "Next\n");
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iter->Next();
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++model_iter;
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ASSERT_EQ(ToString(data, model_iter), ToString(iter));
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}
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break;
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}
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case 1: {
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if (kVerbose) std::fprintf(stderr, "SeekToFirst\n");
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iter->SeekToFirst();
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model_iter = data.begin();
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ASSERT_EQ(ToString(data, model_iter), ToString(iter));
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break;
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}
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case 2: {
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std::string key = PickRandomKey(rnd, keys);
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model_iter = data.lower_bound(key);
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if (kVerbose)
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std::fprintf(stderr, "Seek '%s'\n", EscapeString(key).c_str());
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iter->Seek(Slice(key));
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ASSERT_EQ(ToString(data, model_iter), ToString(iter));
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break;
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}
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case 3: {
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if (iter->Valid()) {
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if (kVerbose) std::fprintf(stderr, "Prev\n");
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iter->Prev();
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if (model_iter == data.begin()) {
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model_iter = data.end(); // Wrap around to invalid value
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} else {
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--model_iter;
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}
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ASSERT_EQ(ToString(data, model_iter), ToString(iter));
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}
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break;
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}
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case 4: {
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if (kVerbose) std::fprintf(stderr, "SeekToLast\n");
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iter->SeekToLast();
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if (keys.empty()) {
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model_iter = data.end();
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} else {
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std::string last = data.rbegin()->first;
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model_iter = data.lower_bound(last);
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}
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ASSERT_EQ(ToString(data, model_iter), ToString(iter));
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break;
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}
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}
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}
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delete iter;
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}
|
|
|
|
std::string ToString(const KVMap& data, const KVMap::const_iterator& it) {
|
|
if (it == data.end()) {
|
|
return "END";
|
|
} else {
|
|
return "'" + it->first + "->" + it->second + "'";
|
|
}
|
|
}
|
|
|
|
std::string ToString(const KVMap& data,
|
|
const KVMap::const_reverse_iterator& it) {
|
|
if (it == data.rend()) {
|
|
return "END";
|
|
} else {
|
|
return "'" + it->first + "->" + it->second + "'";
|
|
}
|
|
}
|
|
|
|
std::string ToString(const Iterator* it) {
|
|
if (!it->Valid()) {
|
|
return "END";
|
|
} else {
|
|
return "'" + it->key().ToString() + "->" + it->value().ToString() + "'";
|
|
}
|
|
}
|
|
|
|
std::string PickRandomKey(Random* rnd, const std::vector<std::string>& keys) {
|
|
if (keys.empty()) {
|
|
return "foo";
|
|
} else {
|
|
const int index = rnd->Uniform(keys.size());
|
|
std::string result = keys[index];
|
|
switch (rnd->Uniform(3)) {
|
|
case 0:
|
|
// Return an existing key
|
|
break;
|
|
case 1: {
|
|
// Attempt to return something smaller than an existing key
|
|
if (!result.empty() && result[result.size() - 1] > '\0') {
|
|
result[result.size() - 1]--;
|
|
}
|
|
break;
|
|
}
|
|
case 2: {
|
|
// Return something larger than an existing key
|
|
Increment(options_.comparator, &result);
|
|
break;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
}
|
|
|
|
// Returns nullptr if not running against a DB
|
|
DB* db() const { return constructor_->db(); }
|
|
|
|
private:
|
|
Options options_;
|
|
Constructor* constructor_;
|
|
};
|
|
|
|
// Test empty table/block.
|
|
TEST_F(Harness, Empty) {
|
|
for (int i = 0; i < kNumTestArgs; i++) {
|
|
Init(kTestArgList[i]);
|
|
Random rnd(test::RandomSeed() + 1);
|
|
Test(&rnd);
|
|
}
|
|
}
|
|
|
|
// Special test for a block with no restart entries. The C++ leveldb
|
|
// code never generates such blocks, but the Java version of leveldb
|
|
// seems to.
|
|
TEST_F(Harness, ZeroRestartPointsInBlock) {
|
|
char data[sizeof(uint32_t)];
|
|
memset(data, 0, sizeof(data));
|
|
BlockContents contents;
|
|
contents.data = Slice(data, sizeof(data));
|
|
contents.cachable = false;
|
|
contents.heap_allocated = false;
|
|
Block block(contents);
|
|
Iterator* iter = block.NewIterator(BytewiseComparator());
|
|
iter->SeekToFirst();
|
|
ASSERT_TRUE(!iter->Valid());
|
|
iter->SeekToLast();
|
|
ASSERT_TRUE(!iter->Valid());
|
|
iter->Seek("foo");
|
|
ASSERT_TRUE(!iter->Valid());
|
|
delete iter;
|
|
}
|
|
|
|
// Test the empty key
|
|
TEST_F(Harness, SimpleEmptyKey) {
|
|
for (int i = 0; i < kNumTestArgs; i++) {
|
|
Init(kTestArgList[i]);
|
|
Random rnd(test::RandomSeed() + 1);
|
|
Add("", "v");
|
|
Test(&rnd);
|
|
}
|
|
}
|
|
|
|
TEST_F(Harness, SimpleSingle) {
|
|
for (int i = 0; i < kNumTestArgs; i++) {
|
|
Init(kTestArgList[i]);
|
|
Random rnd(test::RandomSeed() + 2);
|
|
Add("abc", "v");
|
|
Test(&rnd);
|
|
}
|
|
}
|
|
|
|
TEST_F(Harness, SimpleMulti) {
|
|
for (int i = 0; i < kNumTestArgs; i++) {
|
|
Init(kTestArgList[i]);
|
|
Random rnd(test::RandomSeed() + 3);
|
|
Add("abc", "v");
|
|
Add("abcd", "v");
|
|
Add("ac", "v2");
|
|
Test(&rnd);
|
|
}
|
|
}
|
|
|
|
TEST_F(Harness, SimpleSpecialKey) {
|
|
for (int i = 0; i < kNumTestArgs; i++) {
|
|
Init(kTestArgList[i]);
|
|
Random rnd(test::RandomSeed() + 4);
|
|
Add("\xff\xff", "v3");
|
|
Test(&rnd);
|
|
}
|
|
}
|
|
|
|
TEST_F(Harness, Randomized) {
|
|
for (int i = 0; i < kNumTestArgs; i++) {
|
|
Init(kTestArgList[i]);
|
|
Random rnd(test::RandomSeed() + 5);
|
|
for (int num_entries = 0; num_entries < 2000;
|
|
num_entries += (num_entries < 50 ? 1 : 200)) {
|
|
if ((num_entries % 10) == 0) {
|
|
std::fprintf(stderr, "case %d of %d: num_entries = %d\n", (i + 1),
|
|
int(kNumTestArgs), num_entries);
|
|
}
|
|
for (int e = 0; e < num_entries; e++) {
|
|
std::string v;
|
|
Add(test::RandomKey(&rnd, rnd.Skewed(4)),
|
|
test::RandomString(&rnd, rnd.Skewed(5), &v).ToString());
|
|
}
|
|
Test(&rnd);
|
|
}
|
|
}
|
|
}
|
|
|
|
TEST_F(Harness, RandomizedLongDB) {
|
|
Random rnd(test::RandomSeed());
|
|
TestArgs args = {DB_TEST, false, 16};
|
|
Init(args);
|
|
int num_entries = 100000;
|
|
for (int e = 0; e < num_entries; e++) {
|
|
std::string v;
|
|
Add(test::RandomKey(&rnd, rnd.Skewed(4)),
|
|
test::RandomString(&rnd, rnd.Skewed(5), &v).ToString());
|
|
}
|
|
Test(&rnd);
|
|
|
|
// We must have created enough data to force merging
|
|
int files = 0;
|
|
for (int level = 0; level < config::kNumLevels; level++) {
|
|
std::string value;
|
|
char name[100];
|
|
std::snprintf(name, sizeof(name), "leveldb.num-files-at-level%d", level);
|
|
ASSERT_TRUE(db()->GetProperty(name, &value));
|
|
files += atoi(value.c_str());
|
|
}
|
|
ASSERT_GT(files, 0);
|
|
}
|
|
|
|
TEST(MemTableTest, Simple) {
|
|
InternalKeyComparator cmp(BytewiseComparator());
|
|
MemTable* memtable = new MemTable(cmp);
|
|
memtable->Ref();
|
|
WriteBatch batch;
|
|
WriteBatchInternal::SetSequence(&batch, 100);
|
|
batch.Put(std::string("k1"), std::string("v1"));
|
|
batch.Put(std::string("k2"), std::string("v2"));
|
|
batch.Put(std::string("k3"), std::string("v3"));
|
|
batch.Put(std::string("largekey"), std::string("vlarge"));
|
|
ASSERT_TRUE(WriteBatchInternal::InsertInto(&batch, memtable).ok());
|
|
|
|
Iterator* iter = memtable->NewIterator();
|
|
iter->SeekToFirst();
|
|
while (iter->Valid()) {
|
|
std::fprintf(stderr, "key: '%s' -> '%s'\n", iter->key().ToString().c_str(),
|
|
iter->value().ToString().c_str());
|
|
iter->Next();
|
|
}
|
|
|
|
delete iter;
|
|
memtable->Unref();
|
|
}
|
|
|
|
static bool Between(uint64_t val, uint64_t low, uint64_t high) {
|
|
bool result = (val >= low) && (val <= high);
|
|
if (!result) {
|
|
std::fprintf(stderr, "Value %llu is not in range [%llu, %llu]\n",
|
|
(unsigned long long)(val), (unsigned long long)(low),
|
|
(unsigned long long)(high));
|
|
}
|
|
return result;
|
|
}
|
|
|
|
TEST(TableTest, ApproximateOffsetOfPlain) {
|
|
TableConstructor c(BytewiseComparator());
|
|
c.Add("k01", "hello");
|
|
c.Add("k02", "hello2");
|
|
c.Add("k03", std::string(10000, 'x'));
|
|
c.Add("k04", std::string(200000, 'x'));
|
|
c.Add("k05", std::string(300000, 'x'));
|
|
c.Add("k06", "hello3");
|
|
c.Add("k07", std::string(100000, 'x'));
|
|
std::vector<std::string> keys;
|
|
KVMap kvmap;
|
|
Options options;
|
|
options.block_size = 1024;
|
|
options.compression = kNoCompression;
|
|
c.Finish(options, &keys, &kvmap);
|
|
|
|
ASSERT_TRUE(Between(c.ApproximateOffsetOf("abc"), 0, 0));
|
|
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k01"), 0, 0));
|
|
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k01a"), 0, 0));
|
|
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k02"), 0, 0));
|
|
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k03"), 0, 0));
|
|
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k04"), 10000, 11000));
|
|
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k04a"), 210000, 211000));
|
|
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k05"), 210000, 211000));
|
|
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k06"), 510000, 511000));
|
|
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k07"), 510000, 511000));
|
|
ASSERT_TRUE(Between(c.ApproximateOffsetOf("xyz"), 610000, 612000));
|
|
}
|
|
|
|
static bool SnappyCompressionSupported() {
|
|
std::string out;
|
|
Slice in = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
|
|
return port::Snappy_Compress(in.data(), in.size(), &out);
|
|
}
|
|
|
|
TEST(TableTest, ApproximateOffsetOfCompressed) {
|
|
if (!SnappyCompressionSupported()) {
|
|
std::fprintf(stderr, "skipping compression tests\n");
|
|
return;
|
|
}
|
|
|
|
Random rnd(301);
|
|
TableConstructor c(BytewiseComparator());
|
|
std::string tmp;
|
|
c.Add("k01", "hello");
|
|
c.Add("k02", test::CompressibleString(&rnd, 0.25, 10000, &tmp));
|
|
c.Add("k03", "hello3");
|
|
c.Add("k04", test::CompressibleString(&rnd, 0.25, 10000, &tmp));
|
|
std::vector<std::string> keys;
|
|
KVMap kvmap;
|
|
Options options;
|
|
options.block_size = 1024;
|
|
options.compression = kSnappyCompression;
|
|
c.Finish(options, &keys, &kvmap);
|
|
|
|
// Expected upper and lower bounds of space used by compressible strings.
|
|
static const int kSlop = 1000; // Compressor effectiveness varies.
|
|
const int expected = 2500; // 10000 * compression ratio (0.25)
|
|
const int min_z = expected - kSlop;
|
|
const int max_z = expected + kSlop;
|
|
|
|
ASSERT_TRUE(Between(c.ApproximateOffsetOf("abc"), 0, kSlop));
|
|
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k01"), 0, kSlop));
|
|
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k02"), 0, kSlop));
|
|
// Have now emitted a large compressible string, so adjust expected offset.
|
|
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k03"), min_z, max_z));
|
|
ASSERT_TRUE(Between(c.ApproximateOffsetOf("k04"), min_z, max_z));
|
|
// Have now emitted two large compressible strings, so adjust expected offset.
|
|
ASSERT_TRUE(Between(c.ApproximateOffsetOf("xyz"), 2 * min_z, 2 * max_z));
|
|
}
|
|
|
|
} // namespace leveldb
|