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@ -57,17 +57,22 @@ std::string IntSetToString(const std::set& s) { |
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Version::~Version() { |
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assert(refs_ == 0); |
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// Remove from linked list
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prev_->next_ = next_; |
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next_->prev_ = prev_; |
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// Drop references to files
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for (int level = 0; level < config::kNumLevels; level++) { |
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for (size_t i = 0; i < files_[level].size(); i++) { |
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FileMetaData* f = files_[level][i]; |
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assert(f->refs >= 0); |
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assert(f->refs > 0); |
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f->refs--; |
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if (f->refs <= 0) { |
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delete f; |
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} |
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} |
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} |
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delete cleanup_mem_; |
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} |
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// An internal iterator. For a given version/level pair, yields
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@ -77,9 +82,9 @@ Version::~Version() { |
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// encoded using EncodeFixed64.
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class Version::LevelFileNumIterator : public Iterator { |
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public: |
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LevelFileNumIterator(const Version* version, |
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LevelFileNumIterator(const InternalKeyComparator& icmp, |
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const std::vector<FileMetaData*>* flist) |
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: icmp_(version->vset_->icmp_.user_comparator()), |
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: icmp_(icmp), |
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flist_(flist), |
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index_(flist->size()) { // Marks as invalid
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} |
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@ -157,7 +162,7 @@ static Iterator* GetFileIterator(void* arg, |
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Iterator* Version::NewConcatenatingIterator(const ReadOptions& options, |
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int level) const { |
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return NewTwoLevelIterator( |
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new LevelFileNumIterator(this, &files_[level]), |
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new LevelFileNumIterator(vset_->icmp_, &files_[level]), |
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&GetFileIterator, vset_->table_cache_, options); |
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} |
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@ -185,11 +190,11 @@ void Version::Ref() { |
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} |
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void Version::Unref() { |
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assert(this != &vset_->dummy_versions_); |
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assert(refs_ >= 1); |
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--refs_; |
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if (refs_ == 0) { |
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vset_->MaybeDeleteOldVersions(); |
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// TODO: try to delete obsolete files
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delete this; |
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} |
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} |
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@ -222,37 +227,58 @@ std::string Version::DebugString() const { |
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// Versions that contain full copies of the intermediate state.
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class VersionSet::Builder { |
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private: |
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typedef std::map<uint64_t, FileMetaData*> FileMap; |
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// Helper to sort by v->files_[file_number].smallest
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struct BySmallestKey { |
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const InternalKeyComparator* internal_comparator; |
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bool operator()(FileMetaData* f1, FileMetaData* f2) const { |
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int r = internal_comparator->Compare(f1->smallest, f2->smallest); |
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if (r != 0) { |
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return (r < 0); |
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} else { |
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// Break ties by file number
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return (f1->number < f2->number); |
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} |
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} |
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}; |
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typedef std::set<FileMetaData*, BySmallestKey> FileSet; |
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struct LevelState { |
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std::set<uint64_t> deleted_files; |
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FileSet* added_files; |
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}; |
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VersionSet* vset_; |
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FileMap files_[config::kNumLevels]; |
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Version* base_; |
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LevelState levels_[config::kNumLevels]; |
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public: |
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// Initialize a builder with the files from *base and other info from *vset
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Builder(VersionSet* vset, Version* base) |
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: vset_(vset) { |
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: vset_(vset), |
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base_(base) { |
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base_->Ref(); |
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BySmallestKey cmp; |
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cmp.internal_comparator = &vset_->icmp_; |
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for (int level = 0; level < config::kNumLevels; level++) { |
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const std::vector<FileMetaData*>& files = base->files_[level]; |
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for (size_t i = 0; i < files.size(); i++) { |
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FileMetaData* f = files[i]; |
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f->refs++; |
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files_[level].insert(std::make_pair(f->number, f)); |
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} |
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levels_[level].added_files = new FileSet(cmp); |
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} |
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} |
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~Builder() { |
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for (int level = 0; level < config::kNumLevels; level++) { |
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const FileMap& fmap = files_[level]; |
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for (FileMap::const_iterator iter = fmap.begin(); |
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iter != fmap.end(); |
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++iter) { |
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FileMetaData* f = iter->second; |
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std::vector<FileMetaData*> to_unref(levels_[level].added_files->begin(), |
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levels_[level].added_files->end()); |
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delete levels_[level].added_files; |
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for (int i = 0; i < to_unref.size(); i++) { |
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FileMetaData* f = to_unref[i]; |
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f->refs--; |
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if (f->refs <= 0) { |
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delete f; |
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} |
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} |
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} |
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base_->Unref(); |
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} |
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// Apply all of the edits in *edit to the current state.
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@ -271,16 +297,7 @@ class VersionSet::Builder { |
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++iter) { |
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const int level = iter->first; |
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const uint64_t number = iter->second; |
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FileMap::iterator fiter = files_[level].find(number); |
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assert(fiter != files_[level].end()); // Sanity check for debug mode
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if (fiter != files_[level].end()) { |
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FileMetaData* f = fiter->second; |
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f->refs--; |
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if (f->refs <= 0) { |
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delete f; |
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} |
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files_[level].erase(fiter); |
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} |
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levels_[level].deleted_files.insert(number); |
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} |
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// Add new files
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@ -288,22 +305,66 @@ class VersionSet::Builder { |
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const int level = edit->new_files_[i].first; |
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FileMetaData* f = new FileMetaData(edit->new_files_[i].second); |
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f->refs = 1; |
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assert(files_[level].count(f->number) == 0); |
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files_[level].insert(std::make_pair(f->number, f)); |
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levels_[level].deleted_files.erase(f->number); |
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levels_[level].added_files->insert(f); |
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} |
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} |
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// Save the current state in *v.
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void SaveTo(Version* v) { |
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BySmallestKey cmp; |
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cmp.internal_comparator = &vset_->icmp_; |
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for (int level = 0; level < config::kNumLevels; level++) { |
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const FileMap& fmap = files_[level]; |
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for (FileMap::const_iterator iter = fmap.begin(); |
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iter != fmap.end(); |
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++iter) { |
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FileMetaData* f = iter->second; |
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f->refs++; |
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v->files_[level].push_back(f); |
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// Merge the set of added files with the set of pre-existing files.
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// Drop any deleted files. Store the result in *v.
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const std::vector<FileMetaData*>& base_files = base_->files_[level]; |
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std::vector<FileMetaData*>::const_iterator base_iter = base_files.begin(); |
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std::vector<FileMetaData*>::const_iterator base_end = base_files.end(); |
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const FileSet* added = levels_[level].added_files; |
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v->files_[level].reserve(base_files.size() + added->size()); |
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for (FileSet::const_iterator added_iter = added->begin(); |
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added_iter != added->end(); |
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++added_iter) { |
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// Add all smaller files listed in base_
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for (std::vector<FileMetaData*>::const_iterator bpos |
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= std::upper_bound(base_iter, base_end, *added_iter, cmp); |
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base_iter != bpos; |
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++base_iter) { |
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MaybeAddFile(v, level, *base_iter); |
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} |
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MaybeAddFile(v, level, *added_iter); |
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} |
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// Add remaining base files
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for (; base_iter != base_end; ++base_iter) { |
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MaybeAddFile(v, level, *base_iter); |
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} |
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#ifndef NDEBUG
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// Make sure there is no overlap in levels > 0
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if (level > 0) { |
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for (int i = 1; i < v->files_[level].size(); i++) { |
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const InternalKey& prev_end = v->files_[level][i-1]->largest; |
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const InternalKey& this_begin = v->files_[level][i]->smallest; |
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if (vset_->icmp_.Compare(prev_end, this_begin) >= 0) { |
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fprintf(stderr, "overlapping ranges in same level %s vs. %s\n", |
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EscapeString(prev_end.Encode()).c_str(), |
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EscapeString(this_begin.Encode()).c_str()); |
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abort(); |
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} |
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} |
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} |
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#endif
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} |
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} |
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void MaybeAddFile(Version* v, int level, FileMetaData* f) { |
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if (levels_[level].deleted_files.count(f->number) > 0) { |
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// File is deleted: do nothing
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} else { |
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f->refs++; |
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v->files_[level].push_back(f); |
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} |
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} |
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}; |
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@ -324,22 +385,36 @@ VersionSet::VersionSet(const std::string& dbname, |
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prev_log_number_(0), |
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descriptor_file_(NULL), |
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descriptor_log_(NULL), |
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current_(new Version(this)), |
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oldest_(current_) { |
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dummy_versions_(this), |
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current_(NULL) { |
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AppendVersion(new Version(this)); |
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} |
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VersionSet::~VersionSet() { |
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for (Version* v = oldest_; v != NULL; ) { |
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Version* next = v->next_; |
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assert(v->refs_ == 0); |
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delete v; |
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v = next; |
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} |
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current_->Unref(); |
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assert(dummy_versions_.next_ == &dummy_versions_); // List must be empty
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delete descriptor_log_; |
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delete descriptor_file_; |
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} |
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Status VersionSet::LogAndApply(VersionEdit* edit, MemTable* cleanup_mem) { |
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void VersionSet::AppendVersion(Version* v) { |
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// Make "v" current
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assert(v->refs_ == 0); |
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assert(v != current_); |
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if (current_ != NULL) { |
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current_->Unref(); |
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} |
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current_ = v; |
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v->Ref(); |
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// Append to linked list
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v->prev_ = dummy_versions_.prev_; |
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v->next_ = &dummy_versions_; |
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v->prev_->next_ = v; |
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v->next_->prev_ = v; |
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} |
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Status VersionSet::LogAndApply(VersionEdit* edit) { |
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if (edit->has_log_number_) { |
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assert(edit->log_number_ >= log_number_); |
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assert(edit->log_number_ < next_file_number_); |
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@ -360,22 +435,20 @@ Status VersionSet::LogAndApply(VersionEdit* edit, MemTable* cleanup_mem) { |
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builder.Apply(edit); |
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builder.SaveTo(v); |
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} |
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std::string new_manifest_file; |
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Status s = Finalize(v); |
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Finalize(v); |
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// Initialize new descriptor log file if necessary by creating
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// a temporary file that contains a snapshot of the current version.
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if (s.ok()) { |
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if (descriptor_log_ == NULL) { |
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assert(descriptor_file_ == NULL); |
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new_manifest_file = DescriptorFileName(dbname_, manifest_file_number_); |
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edit->SetNextFile(next_file_number_); |
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s = env_->NewWritableFile(new_manifest_file, &descriptor_file_); |
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if (s.ok()) { |
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descriptor_log_ = new log::Writer(descriptor_file_); |
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s = WriteSnapshot(descriptor_log_); |
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} |
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std::string new_manifest_file; |
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Status s; |
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if (descriptor_log_ == NULL) { |
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assert(descriptor_file_ == NULL); |
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new_manifest_file = DescriptorFileName(dbname_, manifest_file_number_); |
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edit->SetNextFile(next_file_number_); |
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s = env_->NewWritableFile(new_manifest_file, &descriptor_file_); |
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if (s.ok()) { |
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descriptor_log_ = new log::Writer(descriptor_file_); |
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s = WriteSnapshot(descriptor_log_); |
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} |
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} |
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@ -397,12 +470,7 @@ Status VersionSet::LogAndApply(VersionEdit* edit, MemTable* cleanup_mem) { |
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// Install the new version
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if (s.ok()) { |
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assert(current_->next_ == NULL); |
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assert(current_->cleanup_mem_ == NULL); |
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current_->cleanup_mem_ = cleanup_mem; |
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v->next_ = NULL; |
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current_->next_ = v; |
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current_ = v; |
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AppendVersion(v); |
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log_number_ = edit->log_number_; |
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prev_log_number_ = edit->prev_log_number_; |
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} else { |
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@ -458,7 +526,7 @@ Status VersionSet::Recover() { |
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{ |
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LogReporter reporter; |
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reporter.status = &s; |
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log::Reader reader(file, &reporter, true/*checksum*/); |
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|
log::Reader reader(file, &reporter, true/*checksum*/, 0/*initial_offset*/); |
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|
|
Slice record; |
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std::string scratch; |
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while (reader.ReadRecord(&record, &scratch) && s.ok()) { |
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@ -518,20 +586,14 @@ Status VersionSet::Recover() { |
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if (s.ok()) { |
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Version* v = new Version(this); |
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builder.SaveTo(v); |
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s = Finalize(v); |
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|
|
if (!s.ok()) { |
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|
|
delete v; |
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|
} else { |
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|
|
// Install recovered version
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|
|
v->next_ = NULL; |
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|
|
current_->next_ = v; |
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|
current_ = v; |
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|
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manifest_file_number_ = next_file; |
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next_file_number_ = next_file + 1; |
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|
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last_sequence_ = last_sequence; |
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log_number_ = log_number; |
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|
|
prev_log_number_ = prev_log_number; |
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|
|
} |
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|
|
// Install recovered version
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|
|
Finalize(v); |
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|
|
AppendVersion(v); |
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|
|
manifest_file_number_ = next_file; |
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|
|
next_file_number_ = next_file + 1; |
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|
|
last_sequence_ = last_sequence; |
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|
|
log_number_ = log_number; |
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|
|
prev_log_number_ = prev_log_number; |
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|
|
} |
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|
|
return s; |
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|
@ -545,15 +607,12 @@ static int64_t TotalFileSize(const std::vector& files) { |
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|
|
return sum; |
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|
|
} |
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|
|
|
Status VersionSet::Finalize(Version* v) { |
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|
|
void VersionSet::Finalize(Version* v) { |
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|
|
// Precomputed best level for next compaction
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|
|
int best_level = -1; |
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|
|
double best_score = -1; |
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|
|
Status s; |
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|
|
for (int level = 0; s.ok() && level < config::kNumLevels-1; level++) { |
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|
|
s = SortLevel(v, level); |
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|
|
for (int level = 0; level < config::kNumLevels-1; level++) { |
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|
|
double score; |
|
|
|
if (level == 0) { |
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|
|
// We treat level-0 specially by bounding the number of files
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|
|
@ -567,7 +626,8 @@ Status VersionSet::Finalize(Version* v) { |
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|
|
// file size is small (perhaps because of a small write-buffer
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|
|
// setting, or very high compression ratios, or lots of
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|
|
// overwrites/deletions).
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|
|
score = v->files_[level].size() / 4.0; |
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|
|
score = v->files_[level].size() / |
|
|
|
static_cast<double>(config::kL0_CompactionTrigger); |
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|
|
} else { |
|
|
|
// Compute the ratio of current size to size limit.
|
|
|
|
const uint64_t level_bytes = TotalFileSize(v->files_[level]); |
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|
|
@ -582,7 +642,6 @@ Status VersionSet::Finalize(Version* v) { |
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|
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|
|
v->compaction_level_ = best_level; |
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|
|
v->compaction_score_ = best_score; |
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|
|
return s; |
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|
|
} |
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Status VersionSet::WriteSnapshot(log::Writer* log) { |
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@ -615,44 +674,27 @@ Status VersionSet::WriteSnapshot(log::Writer* log) { |
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return log->AddRecord(record); |
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} |
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// Helper to sort by tables_[file_number].smallest
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struct VersionSet::BySmallestKey { |
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const InternalKeyComparator* internal_comparator; |
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bool operator()(FileMetaData* f1, FileMetaData* f2) const { |
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return internal_comparator->Compare(f1->smallest, f2->smallest) < 0; |
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} |
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}; |
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Status VersionSet::SortLevel(Version* v, uint64_t level) { |
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Status result; |
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BySmallestKey cmp; |
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cmp.internal_comparator = &icmp_; |
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std::sort(v->files_[level].begin(), v->files_[level].end(), cmp); |
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if (result.ok() && level > 0) { |
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// There should be no overlap
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for (size_t i = 1; i < v->files_[level].size(); i++) { |
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const InternalKey& prev_end = v->files_[level][i-1]->largest; |
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const InternalKey& this_begin = v->files_[level][i]->smallest; |
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if (icmp_.Compare(prev_end, this_begin) >= 0) { |
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result = Status::Corruption( |
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"overlapping ranges in same level", |
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(EscapeString(prev_end.Encode()) + " vs. " + |
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EscapeString(this_begin.Encode()))); |
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break; |
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} |
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} |
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} |
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return result; |
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} |
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int VersionSet::NumLevelFiles(int level) const { |
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assert(level >= 0); |
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assert(level < config::kNumLevels); |
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return current_->files_[level].size(); |
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} |
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const char* VersionSet::LevelSummary(LevelSummaryStorage* scratch) const { |
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// Update code if kNumLevels changes
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assert(config::kNumLevels == 7); |
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snprintf(scratch->buffer, sizeof(scratch->buffer), |
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"files[ %d %d %d %d %d %d %d ]", |
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int(current_->files_[0].size()), |
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int(current_->files_[1].size()), |
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int(current_->files_[2].size()), |
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int(current_->files_[3].size()), |
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int(current_->files_[4].size()), |
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int(current_->files_[5].size()), |
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int(current_->files_[6].size())); |
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return scratch->buffer; |
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} |
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uint64_t VersionSet::ApproximateOffsetOf(Version* v, const InternalKey& ikey) { |
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uint64_t result = 0; |
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|
for (int level = 0; level < config::kNumLevels; level++) { |
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|
@ -685,19 +727,10 @@ uint64_t VersionSet::ApproximateOffsetOf(Version* v, const InternalKey& ikey) { |
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|
return result; |
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|
} |
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|
|
void VersionSet::MaybeDeleteOldVersions() { |
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|
// Note: it is important to delete versions in order since a newer
|
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|
|
// version with zero refs may be holding a pointer to a memtable
|
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|
|
// that is used by somebody who has a ref on an older version.
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|
|
while (oldest_ != current_ && oldest_->refs_ == 0) { |
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|
|
Version* next = oldest_->next_; |
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|
|
delete oldest_; |
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|
|
oldest_ = next; |
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|
|
} |
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|
|
} |
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|
|
void VersionSet::AddLiveFiles(std::set<uint64_t>* live) { |
|
|
|
for (Version* v = oldest_; v != NULL; v = v->next_) { |
|
|
|
for (Version* v = dummy_versions_.next_; |
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|
|
v != &dummy_versions_; |
|
|
|
v = v->next_) { |
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|
|
for (int level = 0; level < config::kNumLevels; level++) { |
|
|
|
const std::vector<FileMetaData*>& files = v->files_[level]; |
|
|
|
for (size_t i = 0; i < files.size(); i++) { |
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|
|
@ -809,8 +842,7 @@ Iterator* VersionSet::MakeInputIterator(Compaction* c) { |
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|
|
} else { |
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|
|
// Create concatenating iterator for the files from this level
|
|
|
|
list[num++] = NewTwoLevelIterator( |
|
|
|
new Version::LevelFileNumIterator( |
|
|
|
c->input_version_, &c->inputs_[which]), |
|
|
|
new Version::LevelFileNumIterator(icmp_, &c->inputs_[which]), |
|
|
|
&GetFileIterator, table_cache_, options); |
|
|
|
} |
|
|
|
} |
|
|
|
@ -996,11 +1028,12 @@ bool Compaction::IsBaseLevelForKey(const Slice& user_key) { |
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|
|
return true; |
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|
|
} |
|
|
|
|
|
|
|
bool Compaction::ShouldStopBefore(const InternalKey& key) { |
|
|
|
bool Compaction::ShouldStopBefore(const Slice& internal_key) { |
|
|
|
// Scan to find earliest grandparent file that contains key.
|
|
|
|
const InternalKeyComparator* icmp = &input_version_->vset_->icmp_; |
|
|
|
while (grandparent_index_ < grandparents_.size() && |
|
|
|
icmp->Compare(key, grandparents_[grandparent_index_]->largest) > 0) { |
|
|
|
icmp->Compare(internal_key, |
|
|
|
grandparents_[grandparent_index_]->largest.Encode()) > 0) { |
|
|
|
if (seen_key_) { |
|
|
|
overlapped_bytes_ += grandparents_[grandparent_index_]->file_size; |
|
|
|
} |
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dgrogan@chromium.org
il y a 13 ans