Merge branch 'master' into columnfamilies

Conflicts:
	db/version_set.cc
	db/version_set_reduce_num_levels.cc
	util/ldb_cmd.cc
main
Igor Canadi 11 years ago
commit 1423e7c9de
  1. 5
      Makefile
  2. 32
      db/compaction_picker.cc
  3. 5
      db/compaction_picker.h
  4. 90
      db/db_impl.cc
  5. 6
      db/db_impl.h
  6. 4
      db/db_test.cc
  7. 132
      db/memtablelist.cc
  8. 77
      db/memtablelist.h
  9. 71
      db/version_set.cc
  10. 8
      db/version_set.h
  11. 78
      db/version_set_reduce_num_levels.cc
  12. 9
      include/rocksdb/cache.h
  13. 6
      table/block_based_table_factory.cc
  14. 36
      table/block_based_table_factory.h
  15. 31
      table/block_based_table_options.h
  16. 52
      table/block_based_table_reader.cc
  17. 8
      table/block_based_table_reader.h
  18. 14
      table/table_test.cc
  19. 3
      util/cache.cc
  20. 20
      util/ldb_cmd.cc

@ -136,13 +136,12 @@ endif # PLATFORM_SHARED_EXT
all: $(LIBRARY) $(PROGRAMS)
.PHONY: blackbox_crash_test check clean coverage crash_test ldb_tests \
release tags valgrind_check whitebox_crash_test format
release tags valgrind_check whitebox_crash_test format shared_lib
# Will also generate shared libraries.
release:
$(MAKE) clean
OPT=-DNDEBUG $(MAKE) all -j32
OPT=-DNDEBUG $(MAKE) $(SHARED) -j32
coverage:
$(MAKE) clean
@ -202,6 +201,8 @@ tags:
format:
build_tools/format-diff.sh
shared_lib: $(SHARED)
# ---------------------------------------------------------------------------
# Unit tests and tools
# ---------------------------------------------------------------------------

@ -22,6 +22,21 @@ uint64_t TotalFileSize(const std::vector<FileMetaData*>& files) {
return sum;
}
// Multiple two operands. If they overflow, return op1.
uint64_t MultiplyCheckOverflow(uint64_t op1, int op2) {
if (op1 == 0) {
return 0;
}
if (op2 <= 0) {
return op1;
}
uint64_t casted_op2 = (uint64_t) op2;
if (std::numeric_limits<uint64_t>::max() / op1 < casted_op2) {
return op1;
}
return op1 * casted_op2;
}
} // anonymous namespace
CompactionPicker::CompactionPicker(const Options* options,
@ -30,15 +45,7 @@ CompactionPicker::CompactionPicker(const Options* options,
options_(options),
num_levels_(options->num_levels),
icmp_(icmp) {
Init();
}
void CompactionPicker::ReduceNumberOfLevels(int new_levels) {
num_levels_ = new_levels;
Init();
}
void CompactionPicker::Init() {
max_file_size_.reset(new uint64_t[NumberLevels()]);
level_max_bytes_.reset(new uint64_t[NumberLevels()]);
int target_file_size_multiplier = options_->target_file_size_multiplier;
@ -48,10 +55,11 @@ void CompactionPicker::Init() {
max_file_size_[i] = ULLONG_MAX;
level_max_bytes_[i] = options_->max_bytes_for_level_base;
} else if (i > 1) {
max_file_size_[i] = max_file_size_[i - 1] * target_file_size_multiplier;
level_max_bytes_[i] =
level_max_bytes_[i - 1] * max_bytes_multiplier *
options_->max_bytes_for_level_multiplier_additional[i - 1];
max_file_size_[i] = MultiplyCheckOverflow(max_file_size_[i - 1],
target_file_size_multiplier);
level_max_bytes_[i] = MultiplyCheckOverflow(
MultiplyCheckOverflow(level_max_bytes_[i - 1], max_bytes_multiplier),
options_->max_bytes_for_level_multiplier_additional[i - 1]);
} else {
max_file_size_[i] = options_->target_file_size_base;
level_max_bytes_[i] = options_->max_bytes_for_level_base;

@ -27,9 +27,6 @@ class CompactionPicker {
CompactionPicker(const Options* options, const InternalKeyComparator* icmp);
virtual ~CompactionPicker();
// See VersionSet::ReduceNumberOfLevels()
void ReduceNumberOfLevels(int new_levels);
// Pick level and inputs for a new compaction.
// Returns nullptr if there is no compaction to be done.
// Otherwise returns a pointer to a heap-allocated object that
@ -120,8 +117,6 @@ class CompactionPicker {
const Options* const options_;
private:
void Init();
int num_levels_;
const InternalKeyComparator* const icmp_;

@ -267,6 +267,7 @@ DBImpl::DBImpl(const Options& options, const std::string& dbname)
bg_cv_(&mutex_),
mem_rep_factory_(options_.memtable_factory.get()),
mem_(new MemTable(internal_comparator_, options_)),
imm_(options_.min_write_buffer_number_to_merge),
logfile_number_(0),
super_version_(nullptr),
super_version_number_(0),
@ -363,7 +364,7 @@ DBImpl::~DBImpl() {
delete mem_->Unref();
}
imm_.UnrefAll(&to_delete);
imm_.current()->Unref(&to_delete);
for (MemTable* m: to_delete) {
delete m;
}
@ -511,7 +512,7 @@ bool DBImpl::SuperVersion::Unref() {
void DBImpl::SuperVersion::Cleanup() {
assert(refs.load(std::memory_order_relaxed) == 0);
imm.UnrefAll(&to_delete);
imm->Unref(&to_delete);
MemTable* m = mem->Unref();
if (m != nullptr) {
to_delete.push_back(m);
@ -519,13 +520,13 @@ void DBImpl::SuperVersion::Cleanup() {
current->Unref();
}
void DBImpl::SuperVersion::Init(MemTable* new_mem, const MemTableList& new_imm,
void DBImpl::SuperVersion::Init(MemTable* new_mem, MemTableListVersion* new_imm,
Version* new_current) {
mem = new_mem;
imm = new_imm;
current = new_current;
mem->Ref();
imm.RefAll();
imm->Ref();
current->Ref();
refs.store(1, std::memory_order_relaxed);
}
@ -1226,7 +1227,7 @@ Status DBImpl::FlushMemTableToOutputFile(bool* madeProgress,
mutex_.AssertHeld();
assert(imm_.size() != 0);
if (!imm_.IsFlushPending(options_.min_write_buffer_number_to_merge)) {
if (!imm_.IsFlushPending()) {
Log(options_.info_log, "FlushMemTableToOutputFile already in progress");
Status s = Status::IOError("FlushMemTableToOutputFile already in progress");
return s;
@ -1767,8 +1768,7 @@ void DBImpl::MaybeScheduleFlushOrCompaction() {
} else if (shutting_down_.Acquire_Load()) {
// DB is being deleted; no more background compactions
} else {
bool is_flush_pending =
imm_.IsFlushPending(options_.min_write_buffer_number_to_merge);
bool is_flush_pending = imm_.IsFlushPending();
if (is_flush_pending &&
(bg_flush_scheduled_ < options_.max_background_flushes)) {
// memtable flush needed
@ -1803,8 +1803,7 @@ void DBImpl::BGWorkCompaction(void* db) {
Status DBImpl::BackgroundFlush(bool* madeProgress,
DeletionState& deletion_state) {
Status stat;
while (stat.ok() &&
imm_.IsFlushPending(options_.min_write_buffer_number_to_merge)) {
while (stat.ok() && imm_.IsFlushPending()) {
Log(options_.info_log,
"BackgroundCallFlush doing FlushMemTableToOutputFile, flush slots available %d",
options_.max_background_flushes - bg_flush_scheduled_);
@ -1924,7 +1923,7 @@ Status DBImpl::BackgroundCompaction(bool* madeProgress,
mutex_.AssertHeld();
// TODO: remove memtable flush from formal compaction
while (imm_.IsFlushPending(options_.min_write_buffer_number_to_merge)) {
while (imm_.IsFlushPending()) {
Log(options_.info_log,
"BackgroundCompaction doing FlushMemTableToOutputFile, compaction slots "
"available %d",
@ -2330,7 +2329,7 @@ Status DBImpl::DoCompactionWork(CompactionState* compact,
const uint64_t imm_start = env_->NowMicros();
LogFlush(options_.info_log);
mutex_.Lock();
if (imm_.IsFlushPending(options_.min_write_buffer_number_to_merge)) {
if (imm_.IsFlushPending()) {
FlushMemTableToOutputFile(nullptr, deletion_state);
bg_cv_.SignalAll(); // Wakeup MakeRoomForWrite() if necessary
}
@ -2663,8 +2662,9 @@ Status DBImpl::DoCompactionWork(CompactionState* compact,
namespace {
struct IterState {
port::Mutex* mu;
Version* version;
std::vector<MemTable*> mem; // includes both mem_ and imm_
Version* version = nullptr;
MemTable* mem = nullptr;
MemTableListVersion* imm = nullptr;
DBImpl *db;
};
@ -2673,15 +2673,16 @@ static void CleanupIteratorState(void* arg1, void* arg2) {
DBImpl::DeletionState deletion_state(state->db->GetOptions().
max_write_buffer_number);
state->mu->Lock();
for (unsigned int i = 0; i < state->mem.size(); i++) {
MemTable* m = state->mem[i]->Unref();
MemTable* m = state->mem->Unref();
if (m != nullptr) {
deletion_state.memtables_to_free.push_back(m);
}
}
if (state->version) { // not set for memtable-only iterator
state->version->Unref();
}
if (state->imm) { // not set for memtable-only iterator
state->imm->Unref(&deletion_state.memtables_to_free);
}
// fast path FindObsoleteFiles
state->db->FindObsoleteFiles(deletion_state, false, true);
state->mu->Unlock();
@ -2695,7 +2696,7 @@ Iterator* DBImpl::NewInternalIterator(const ReadOptions& options,
SequenceNumber* latest_snapshot) {
IterState* cleanup = new IterState;
MemTable* mutable_mem;
std::vector<MemTable*> immutables;
MemTableListVersion* immutable_mems;
Version* version;
// Collect together all needed child iterators for mem
@ -2704,27 +2705,22 @@ Iterator* DBImpl::NewInternalIterator(const ReadOptions& options,
mem_->Ref();
mutable_mem = mem_;
// Collect together all needed child iterators for imm_
imm_.GetMemTables(&immutables);
for (unsigned int i = 0; i < immutables.size(); i++) {
immutables[i]->Ref();
}
immutable_mems = imm_.current();
immutable_mems->Ref();
versions_->current()->Ref();
version = versions_->current();
mutex_.Unlock();
std::vector<Iterator*> list;
list.push_back(mutable_mem->NewIterator(options));
cleanup->mem.push_back(mutable_mem);
std::vector<Iterator*> iterator_list;
iterator_list.push_back(mutable_mem->NewIterator(options));
cleanup->mem = mutable_mem;
cleanup->imm = immutable_mems;
// Collect all needed child iterators for immutable memtables
for (MemTable* m : immutables) {
list.push_back(m->NewIterator(options));
cleanup->mem.push_back(m);
}
immutable_mems->AddIterators(options, &iterator_list);
// Collect iterators for files in L0 - Ln
version->AddIterators(options, storage_options_, &list);
Iterator* internal_iter =
NewMergingIterator(&internal_comparator_, &list[0], list.size());
version->AddIterators(options, storage_options_, &iterator_list);
Iterator* internal_iter = NewMergingIterator(
&internal_comparator_, &iterator_list[0], iterator_list.size());
cleanup->version = version;
cleanup->mu = &mutex_;
cleanup->db = this;
@ -2743,19 +2739,15 @@ std::pair<Iterator*, Iterator*> DBImpl::GetTailingIteratorPair(
uint64_t* superversion_number) {
MemTable* mutable_mem;
std::vector<MemTable*> immutables;
MemTableListVersion* immutable_mems;
Version* version;
immutables.reserve(options_.max_write_buffer_number);
// get all child iterators and bump their refcounts under lock
mutex_.Lock();
mutable_mem = mem_;
mutable_mem->Ref();
imm_.GetMemTables(&immutables);
for (size_t i = 0; i < immutables.size(); ++i) {
immutables[i]->Ref();
}
immutable_mems = imm_.current();
immutable_mems->Ref();
version = versions_->current();
version->Ref();
if (superversion_number != nullptr) {
@ -2765,7 +2757,7 @@ std::pair<Iterator*, Iterator*> DBImpl::GetTailingIteratorPair(
Iterator* mutable_iter = mutable_mem->NewIterator(options);
IterState* mutable_cleanup = new IterState();
mutable_cleanup->mem.push_back(mutable_mem);
mutable_cleanup->mem = mutable_mem;
mutable_cleanup->db = this;
mutable_cleanup->mu = &mutex_;
mutable_iter->RegisterCleanup(CleanupIteratorState, mutable_cleanup, nullptr);
@ -2777,10 +2769,8 @@ std::pair<Iterator*, Iterator*> DBImpl::GetTailingIteratorPair(
Iterator* immutable_iter;
IterState* immutable_cleanup = new IterState();
std::vector<Iterator*> list;
for (MemTable* m : immutables) {
list.push_back(m->NewIterator(options));
immutable_cleanup->mem.push_back(m);
}
immutable_mems->AddIterators(options, &list);
immutable_cleanup->imm = immutable_mems;
version->AddIterators(options, storage_options_, &list);
immutable_cleanup->version = version;
immutable_cleanup->db = this;
@ -2837,7 +2827,7 @@ void DBImpl::InstallSuperVersion(DeletionState& deletion_state) {
DBImpl::SuperVersion* DBImpl::InstallSuperVersion(
SuperVersion* new_superversion) {
mutex_.AssertHeld();
new_superversion->Init(mem_, imm_, versions_->current());
new_superversion->Init(mem_, imm_.current(), versions_->current());
SuperVersion* old_superversion = super_version_;
super_version_ = new_superversion;
++super_version_number_;
@ -2880,7 +2870,7 @@ Status DBImpl::GetImpl(const ReadOptions& options,
if (get_version->mem->Get(lkey, value, &s, merge_context, options_)) {
// Done
RecordTick(options_.statistics.get(), MEMTABLE_HIT);
} else if (get_version->imm.Get(lkey, value, &s, merge_context, options_)) {
} else if (get_version->imm->Get(lkey, value, &s, merge_context, options_)) {
// Done
RecordTick(options_.statistics.get(), MEMTABLE_HIT);
} else {
@ -2936,10 +2926,10 @@ std::vector<Status> DBImpl::MultiGet(
}
MemTable* mem = mem_;
MemTableList imm = imm_;
MemTableListVersion* imm = imm_.current();
Version* current = versions_->current();
mem->Ref();
imm.RefAll();
imm->Ref();
current->Ref();
// Unlock while reading from files and memtables
@ -2971,7 +2961,7 @@ std::vector<Status> DBImpl::MultiGet(
LookupKey lkey(keys[i], snapshot);
if (mem->Get(lkey, value, &s, merge_context, options_)) {
// Done
} else if (imm.Get(lkey, value, &s, merge_context, options_)) {
} else if (imm->Get(lkey, value, &s, merge_context, options_)) {
// Done
} else {
current->Get(options, lkey, value, &s, &merge_context, &stats, options_);
@ -2990,7 +2980,7 @@ std::vector<Status> DBImpl::MultiGet(
MaybeScheduleFlushOrCompaction();
}
MemTable* m = mem->Unref();
imm.UnrefAll(&to_delete);
imm->Unref(&to_delete);
current->Unref();
mutex_.Unlock();

@ -177,10 +177,10 @@ class DBImpl : public DB {
// holds references to memtable, all immutable memtables and version
struct SuperVersion {
MemTable* mem;
MemTableList imm;
MemTableListVersion* imm;
Version* current;
std::atomic<uint32_t> refs;
// We need to_delete because during Cleanup(), imm.UnrefAll() returns
// We need to_delete because during Cleanup(), imm->Unref() returns
// all memtables that we need to free through this vector. We then
// delete all those memtables outside of mutex, during destruction
std::vector<MemTable*> to_delete;
@ -198,7 +198,7 @@ class DBImpl : public DB {
// that needs to be deleted in to_delete vector. Unrefing those
// objects needs to be done in the mutex
void Cleanup();
void Init(MemTable* new_mem, const MemTableList& new_imm,
void Init(MemTable* new_mem, MemTableListVersion* new_imm,
Version* new_current);
};

@ -17,6 +17,7 @@
#include "db/filename.h"
#include "db/version_set.h"
#include "db/write_batch_internal.h"
#include "table/block_based_table_factory.h"
#include "rocksdb/cache.h"
#include "rocksdb/compaction_filter.h"
#include "rocksdb/env.h"
@ -735,6 +736,9 @@ TEST(DBTest, IndexAndFilterBlocksOfNewTableAddedToCache) {
options.filter_policy = filter_policy.get();
options.create_if_missing = true;
options.statistics = rocksdb::CreateDBStatistics();
BlockBasedTableOptions table_options;
table_options.cache_index_and_filter_blocks = true;
options.table_factory.reset(new BlockBasedTableFactory(table_options));
DestroyAndReopen(&options);
ASSERT_OK(db_->Put(WriteOptions(), "key", "val"));

@ -16,41 +16,85 @@ namespace rocksdb {
class InternalKeyComparator;
class Mutex;
class MemTableListIterator;
class VersionSet;
using std::list;
// Increase reference count on all underling memtables
void MemTableList::RefAll() {
for (auto &memtable : memlist_) {
memtable->Ref();
MemTableListVersion::MemTableListVersion(MemTableListVersion* old) {
if (old != nullptr) {
memlist_ = old->memlist_;
size_ = old->size_;
for (auto& m : memlist_) {
m->Ref();
}
}
}
// Drop reference count on all underling memtables. If the
// refcount of an underlying memtable drops to zero, then
// return it in to_delete vector.
void MemTableList::UnrefAll(std::vector<MemTable*>* to_delete) {
for (auto &memtable : memlist_) {
MemTable* m = memtable->Unref();
if (m != nullptr) {
to_delete->push_back(m);
void MemTableListVersion::Ref() { ++refs_; }
void MemTableListVersion::Unref(std::vector<MemTable*>* to_delete) {
--refs_;
if (refs_ == 0) {
// if to_delete is equal to nullptr it means we're confident
// that refs_ will not be zero
assert(to_delete != nullptr);
for (const auto& m : memlist_) {
MemTable* x = m->Unref();
if (x != nullptr) {
to_delete->push_back(x);
}
}
delete this;
}
}
int MemTableListVersion::size() const { return size_; }
// Returns the total number of memtables in the list
int MemTableList::size() {
assert(num_flush_not_started_ <= size_);
return size_;
int MemTableList::size() const {
assert(num_flush_not_started_ <= current_->size_);
return current_->size_;
}
// Search all the memtables starting from the most recent one.
// Return the most recent value found, if any.
// Operands stores the list of merge operations to apply, so far.
bool MemTableListVersion::Get(const LookupKey& key, std::string* value,
Status* s, MergeContext& merge_context,
const Options& options) {
for (auto& memtable : memlist_) {
if (memtable->Get(key, value, s, merge_context, options)) {
return true;
}
}
return false;
}
void MemTableListVersion::AddIterators(const ReadOptions& options,
std::vector<Iterator*>* iterator_list) {
for (auto& m : memlist_) {
iterator_list->push_back(m->NewIterator(options));
}
}
void MemTableListVersion::Add(MemTable* m) {
assert(refs_ == 1); // only when refs_ == 1 is MemTableListVersion mutable
m->Ref();
memlist_.push_front(m);
++size_;
}
void MemTableListVersion::Remove(MemTable* m) {
assert(refs_ == 1); // only when refs_ == 1 is MemTableListVersion mutable
MemTable* x __attribute__((unused)) = m->Unref();
assert(x == nullptr); // it still needs to be alive!
memlist_.remove(m);
--size_;
}
// Returns true if there is at least one memtable on which flush has
// not yet started.
bool MemTableList::IsFlushPending(int min_write_buffer_number_to_merge) {
bool MemTableList::IsFlushPending() {
if ((flush_requested_ && num_flush_not_started_ >= 1) ||
(num_flush_not_started_ >= min_write_buffer_number_to_merge)) {
(num_flush_not_started_ >= min_write_buffer_number_to_merge_)) {
assert(imm_flush_needed.NoBarrier_Load() != nullptr);
return true;
}
@ -59,7 +103,8 @@ bool MemTableList::IsFlushPending(int min_write_buffer_number_to_merge) {
// Returns the memtables that need to be flushed.
void MemTableList::PickMemtablesToFlush(std::vector<MemTable*>* ret) {
for (auto it = memlist_.rbegin(); it != memlist_.rend(); it++) {
const auto& memlist = current_->memlist_;
for (auto it = memlist.rbegin(); it != memlist.rend(); ++it) {
MemTable* m = *it;
if (!m->flush_in_progress_) {
assert(!m->flush_completed_);
@ -122,8 +167,8 @@ Status MemTableList::InstallMemtableFlushResults(
// scan all memtables from the earliest, and commit those
// (in that order) that have finished flushing. Memetables
// are always committed in the order that they were created.
while (!memlist_.empty() && s.ok()) {
MemTable* m = memlist_.back(); // get the last element
while (!current_->memlist_.empty() && s.ok()) {
MemTable* m = current_->memlist_.back(); // get the last element
if (!m->flush_completed_) {
break;
}
@ -135,6 +180,10 @@ Status MemTableList::InstallMemtableFlushResults(
// this can release and reacquire the mutex.
s = vset->LogAndApply(&m->edit_, mu);
// we will be changing the version in the next code path,
// so we better create a new one, since versions are immutable
InstallNewVersion();
// All the later memtables that have the same filenum
// are part of the same batch. They can be committed now.
uint64_t mem_id = 1; // how many memtables has been flushed.
@ -144,7 +193,7 @@ Status MemTableList::InstallMemtableFlushResults(
"Level-0 commit table #%lu: memtable #%lu done",
(unsigned long)m->file_number_,
(unsigned long)mem_id);
memlist_.remove(m);
current_->Remove(m);
assert(m->file_number_ > 0);
// pending_outputs can be cleared only after the newly created file
@ -155,7 +204,6 @@ Status MemTableList::InstallMemtableFlushResults(
if (m->Unref() != nullptr) {
to_delete->push_back(m);
}
size_--;
} else {
//commit failed. setup state so that we can flush again.
Log(info_log,
@ -172,7 +220,7 @@ Status MemTableList::InstallMemtableFlushResults(
s = Status::IOError("Unable to commit flushed memtable");
}
++mem_id;
} while (!memlist_.empty() && (m = memlist_.back()) &&
} while (!current_->memlist_.empty() && (m = current_->memlist_.back()) &&
m->file_number_ == file_number);
}
commit_in_progress_ = false;
@ -181,9 +229,9 @@ Status MemTableList::InstallMemtableFlushResults(
// New memtables are inserted at the front of the list.
void MemTableList::Add(MemTable* m) {
assert(size_ >= num_flush_not_started_);
size_++;
memlist_.push_front(m);
assert(current_->size_ >= num_flush_not_started_);
InstallNewVersion();
current_->Add(m);
m->MarkImmutable();
num_flush_not_started_++;
if (num_flush_not_started_ == 1) {
@ -194,28 +242,20 @@ void MemTableList::Add(MemTable* m) {
// Returns an estimate of the number of bytes of data in use.
size_t MemTableList::ApproximateMemoryUsage() {
size_t size = 0;
for (auto &memtable : memlist_) {
for (auto& memtable : current_->memlist_) {
size += memtable->ApproximateMemoryUsage();
}
return size;
}
// Search all the memtables starting from the most recent one.
// Return the most recent value found, if any.
// Operands stores the list of merge operations to apply, so far.
bool MemTableList::Get(const LookupKey& key, std::string* value, Status* s,
MergeContext& merge_context, const Options& options) {
for (auto &memtable : memlist_) {
if (memtable->Get(key, value, s, merge_context, options)) {
return true;
}
}
return false;
}
void MemTableList::GetMemTables(std::vector<MemTable*>* output) {
for (auto &memtable : memlist_) {
output->push_back(memtable);
void MemTableList::InstallNewVersion() {
if (current_->refs_ == 1) {
// we're the only one using the version, just keep using it
} else {
// somebody else holds the current version, we need to create new one
MemTableListVersion* version = current_;
current_ = new MemTableListVersion(current_);
version->Unref();
}
}

@ -7,8 +7,10 @@
#pragma once
#include <string>
#include <list>
#include <deque>
#include <vector>
#include "rocksdb/db.h"
#include "rocksdb/options.h"
#include "rocksdb/iterator.h"
#include "db/dbformat.h"
#include "db/skiplist.h"
#include "memtable.h"
@ -17,44 +19,71 @@ namespace rocksdb {
class InternalKeyComparator;
class Mutex;
class MemTableListIterator;
//
// keeps a list of immutable memtables in a vector. the list is immutable
// if refcount is bigger than one. It is used as a state for Get() and
// Iterator code paths
class MemTableListVersion {
public:
explicit MemTableListVersion(MemTableListVersion* old = nullptr);
void Ref();
void Unref(std::vector<MemTable*>* to_delete = nullptr);
int size() const;
// Search all the memtables starting from the most recent one.
// Return the most recent value found, if any.
bool Get(const LookupKey& key, std::string* value, Status* s,
MergeContext& merge_context, const Options& options);
void AddIterators(const ReadOptions& options,
std::vector<Iterator*>* iterator_list);
// REQUIRE: m is mutable memtable
void Add(MemTable* m);
// REQUIRE: m is mutable memtable
void Remove(MemTable* m);
private:
friend class MemTableList;
std::list<MemTable*> memlist_;
int size_ = 0;
int refs_ = 1;
};
// This class stores references to all the immutable memtables.
// The memtables are flushed to L0 as soon as possible and in
// any order. If there are more than one immutable memtable, their
// flushes can occur concurrently. However, they are 'committed'
// to the manifest in FIFO order to maintain correctness and
// recoverability from a crash.
//
class MemTableList {
public:
// A list of memtables.
MemTableList() : size_(0), num_flush_not_started_(0),
explicit MemTableList(int min_write_buffer_number_to_merge)
: min_write_buffer_number_to_merge_(min_write_buffer_number_to_merge),
current_(new MemTableListVersion()),
num_flush_not_started_(0),
commit_in_progress_(false),
flush_requested_(false) {
imm_flush_needed.Release_Store(nullptr);
current_->Ref();
}
~MemTableList() {};
~MemTableList() {}
MemTableListVersion* current() { return current_; }
// so that backgrund threads can detect non-nullptr pointer to
// determine whether this is anything more to start flushing.
port::AtomicPointer imm_flush_needed;
// Increase reference count on all underling memtables
void RefAll();
// Drop reference count on all underling memtables. If the refcount
// on an underlying memtable drops to zero, then return it in
// to_delete vector.
void UnrefAll(std::vector<MemTable*>* to_delete);
// Returns the total number of memtables in the list
int size();
int size() const;
// Returns true if there is at least one memtable on which flush has
// not yet started.
bool IsFlushPending(int min_write_buffer_number_to_merge);
bool IsFlushPending();
// Returns the earliest memtables that needs to be flushed. The returned
// memtables are guaranteed to be in the ascending order of created time.
@ -75,14 +104,6 @@ class MemTableList {
// Returns an estimate of the number of bytes of data in use.
size_t ApproximateMemoryUsage();
// Search all the memtables starting from the most recent one.
// Return the most recent value found, if any.
bool Get(const LookupKey& key, std::string* value, Status* s,
MergeContext& merge_context, const Options& options);
// Returns the list of underlying memtables.
void GetMemTables(std::vector<MemTable*>* list);
// Request a flush of all existing memtables to storage
void FlushRequested() { flush_requested_ = true; }
@ -91,8 +112,12 @@ class MemTableList {
// void operator=(const MemTableList&);
private:
std::list<MemTable*> memlist_;
int size_;
// DB mutex held
void InstallNewVersion();
int min_write_buffer_number_to_merge_;
MemTableListVersion* current_;
// the number of elements that still need flushing
int num_flush_not_started_;

@ -1874,6 +1874,77 @@ Status VersionSet::ListColumnFamilies(std::vector<std::string>* column_families,
return s;
}
Status VersionSet::ReduceNumberOfLevels(const std::string& dbname,
const Options* options,
const EnvOptions& storage_options,
int new_levels) {
if (new_levels <= 1) {
return Status::InvalidArgument(
"Number of levels needs to be bigger than 1");
}
const InternalKeyComparator cmp(options->comparator);
TableCache tc(dbname, options, storage_options, 10);
VersionSet versions(dbname, options, storage_options, &tc, &cmp);
Status status;
std::vector<ColumnFamilyDescriptor> dummy;
dummy.push_back(ColumnFamilyDescriptor());
status = versions.Recover(dummy);
if (!status.ok()) {
return status;
}
Version* current_version = versions.current();
int current_levels = current_version->NumberLevels();
if (current_levels <= new_levels) {
return Status::OK();
}
// Make sure there are file only on one level from
// (new_levels-1) to (current_levels-1)
int first_nonempty_level = -1;
int first_nonempty_level_filenum = 0;
for (int i = new_levels - 1; i < current_levels; i++) {
int file_num = current_version->NumLevelFiles(i);
if (file_num != 0) {
if (first_nonempty_level < 0) {
first_nonempty_level = i;
first_nonempty_level_filenum = file_num;
} else {
char msg[255];
snprintf(msg, sizeof(msg),
"Found at least two levels containing files: "
"[%d:%d],[%d:%d].\n",
first_nonempty_level, first_nonempty_level_filenum, i,
file_num);
return Status::InvalidArgument(msg);
}
}
}
std::vector<FileMetaData*>* old_files_list = current_version->files_;
std::vector<FileMetaData*>* new_files_list =
new std::vector<FileMetaData*>[new_levels];
for (int i = 0; i < new_levels - 1; i++) {
new_files_list[i] = old_files_list[i];
}
if (first_nonempty_level > 0) {
new_files_list[new_levels - 1] = old_files_list[first_nonempty_level];
}
delete[] current_version->files_;
current_version->files_ = new_files_list;
current_version->num_levels_ = new_levels;
VersionEdit ve;
port::Mutex dummy_mutex;
MutexLock l(&dummy_mutex);
return versions.LogAndApply(&ve, &dummy_mutex, true);
}
Status VersionSet::DumpManifest(Options& options, std::string& dscname,
bool verbose, bool hex) {
// Open the specified manifest file.

@ -302,10 +302,16 @@ class VersionSet {
// Try to reduce the number of levels. This call is valid when
// only one level from the new max level to the old
// max level containing files.
// The call is static, since number of levels is immutable during
// the lifetime of a RocksDB instance. It reduces number of levels
// in a DB by applying changes to manifest.
// For example, a db currently has 7 levels [0-6], and a call to
// to reduce to 5 [0-4] can only be executed when only one level
// among [4-6] contains files.
Status ReduceNumberOfLevels(int new_levels, port::Mutex* mu);
static Status ReduceNumberOfLevels(const std::string& dbname,
const Options* options,
const EnvOptions& storage_options,
int new_levels);
// Return the current version.
Version* current() const {

@ -1,78 +0,0 @@
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
// Copyright (c) 2012 Facebook. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "db/version_set.h"
#include <algorithm>
#include <stdio.h>
#include "db/log_reader.h"
#include "db/log_writer.h"
#include "util/logging.h"
namespace rocksdb {
Status VersionSet::ReduceNumberOfLevels(int new_levels, port::Mutex* mu) {
if(new_levels <= 1) {
return Status::InvalidArgument(
"Number of levels needs to be bigger than 1");
}
// TODO this only works for default column family now
Version* current_version = column_family_set_->GetDefault()->current;
int current_levels = current_version->NumberLevels();
if (current_levels <= new_levels) {
return Status::OK();
}
// Make sure there are file only on one level from
// (new_levels-1) to (current_levels-1)
int first_nonempty_level = -1;
int first_nonempty_level_filenum = 0;
for (int i = new_levels - 1; i < current_levels; i++) {
int file_num = current_version->NumLevelFiles(i);
if (file_num != 0) {
if (first_nonempty_level < 0) {
first_nonempty_level = i;
first_nonempty_level_filenum = file_num;
} else {
char msg[255];
sprintf(msg, "Found at least two levels containing files: "
"[%d:%d],[%d:%d].\n",
first_nonempty_level, first_nonempty_level_filenum, i, file_num);
return Status::InvalidArgument(msg);
}
}
}
Status st;
std::vector<FileMetaData*>* old_files_list = current_version->files_;
std::vector<FileMetaData*>* new_files_list =
new std::vector<FileMetaData*>[new_levels];
for (int i = 0; i < new_levels - 1; i++) {
new_files_list[i] = old_files_list[i];
}
if (first_nonempty_level > 0) {
new_files_list[new_levels - 1] = old_files_list[first_nonempty_level];
}
delete[] current_version->files_;
current_version->files_ = new_files_list;
current_version->num_levels_ = new_levels;
num_levels_ = new_levels;
compaction_picker_->ReduceNumberOfLevels(new_levels);
VersionEdit ve;
st = LogAndApply(&ve, mu, true);
return st;
}
}

@ -104,6 +104,15 @@ class Cache {
// returns the maximum configured capacity of the cache
virtual size_t GetCapacity() = 0;
// Call this on shutdown if you want to speed it up. Cache will disown
// any underlying data and will not free it on delete. This call will leak
// memory - call this only if you're shutting down the process.
// Any attempts of using cache after this call will fail terribly.
// Always delete the DB object before calling this method!
virtual void DisownData() {
// default implementation is noop
};
private:
void LRU_Remove(Handle* e);
void LRU_Append(Handle* e);

@ -20,10 +20,10 @@ namespace rocksdb {
Status BlockBasedTableFactory::GetTableReader(
const Options& options, const EnvOptions& soptions,
unique_ptr<RandomAccessFile> && file, uint64_t file_size,
unique_ptr<RandomAccessFile>&& file, uint64_t file_size,
unique_ptr<TableReader>* table_reader) const {
return BlockBasedTable::Open(options, soptions, std::move(file), file_size,
table_reader);
return BlockBasedTable::Open(options, soptions, table_options_,
std::move(file), file_size, table_reader);
}
TableBuilder* BlockBasedTableFactory::GetTableBuilder(

@ -14,6 +14,7 @@
#include "rocksdb/flush_block_policy.h"
#include "rocksdb/options.h"
#include "rocksdb/table.h"
#include "table/block_based_table_options.h"
namespace rocksdb {
@ -30,40 +31,25 @@ class BlockBasedTable;
class BlockBasedTableBuilder;
class BlockBasedTableFactory: public TableFactory {
public:
struct TableOptions {
// @flush_block_policy_factory creates the instances of flush block policy.
// which provides a configurable way to determine when to flush a block in
// the block based tables. If not set, table builder will use the default
// block flush policy, which cut blocks by block size (please refer to
// `FlushBlockBySizePolicy`).
std::shared_ptr<FlushBlockPolicyFactory> flush_block_policy_factory;
};
public:
BlockBasedTableFactory() : BlockBasedTableFactory(BlockBasedTableOptions()) {}
explicit BlockBasedTableFactory(const BlockBasedTableOptions& table_options)
: table_options_(table_options) {}
BlockBasedTableFactory() : BlockBasedTableFactory(TableOptions()) { }
BlockBasedTableFactory(const TableOptions& table_options):
table_options_(table_options) {
}
~BlockBasedTableFactory() {}
~BlockBasedTableFactory() {
}
const char* Name() const override {
return "BlockBasedTable";
}
const char* Name() const override { return "BlockBasedTable"; }
Status GetTableReader(const Options& options, const EnvOptions& soptions,
unique_ptr<RandomAccessFile> && file,
uint64_t file_size,
unique_ptr<RandomAccessFile>&& file, uint64_t file_size,
unique_ptr<TableReader>* table_reader) const override;
TableBuilder* GetTableBuilder(const Options& options, WritableFile* file,
CompressionType compression_type) const
override;
CompressionType compression_type)
const override;
private:
TableOptions table_options_;
BlockBasedTableOptions table_options_;
};
} // namespace rocksdb

@ -0,0 +1,31 @@
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
#pragma once
#include <memory>
namespace rocksdb {
class FlushBlockPolicyFactory;
struct BlockBasedTableOptions {
// @flush_block_policy_factory creates the instances of flush block policy.
// which provides a configurable way to determine when to flush a block in
// the block based tables. If not set, table builder will use the default
// block flush policy, which cut blocks by block size (please refer to
// `FlushBlockBySizePolicy`).
std::shared_ptr<FlushBlockPolicyFactory> flush_block_policy_factory;
// TODO(kailiu) Temporarily disable this feature by making the default value
// to be false. Also in master branch, this file is non-public so no user
// will be able to change the value of `cache_index_and_filter_blocks`.
//
// Indicating if we'd put index/filter blocks to the block cache.
// If not specified, each "table reader" object will pre-load index/filter
// block during table initialization.
bool cache_index_and_filter_blocks = false;
};
} // namespace rocksdb

@ -26,6 +26,7 @@
#include "util/coding.h"
#include "util/perf_context_imp.h"
#include "util/stop_watch.h"
#include "table/block_based_table_options.h"
namespace rocksdb {
@ -45,9 +46,9 @@ struct BlockBasedTable::Rep {
Status status;
unique_ptr<RandomAccessFile> file;
char cache_key_prefix[kMaxCacheKeyPrefixSize];
size_t cache_key_prefix_size;
size_t cache_key_prefix_size = 0;
char compressed_cache_key_prefix[kMaxCacheKeyPrefixSize];
size_t compressed_cache_key_prefix_size;
size_t compressed_cache_key_prefix_size = 0;
// Handle to metaindex_block: saved from footer
BlockHandle metaindex_handle;
@ -220,20 +221,21 @@ Cache::Handle* GetFromBlockCache(
} // end of anonymous namespace
Status BlockBasedTable::Open(const Options& options,
const EnvOptions& soptions,
unique_ptr<RandomAccessFile> && file,
uint64_t size,
Status BlockBasedTable::Open(const Options& options, const EnvOptions& soptions,
const BlockBasedTableOptions& table_options,
unique_ptr<RandomAccessFile>&& file,
uint64_t file_size,
unique_ptr<TableReader>* table_reader) {
table_reader->reset();
if (size < Footer::kEncodedLength) {
if (file_size < Footer::kEncodedLength) {
return Status::InvalidArgument("file is too short to be an sstable");
}
char footer_space[Footer::kEncodedLength];
Slice footer_input;
Status s = file->Read(size - Footer::kEncodedLength, Footer::kEncodedLength,
&footer_input, footer_space);
Status s = file->Read(file_size - Footer::kEncodedLength,
Footer::kEncodedLength, &footer_input, footer_space);
if (!s.ok()) return s;
// Check that we actually read the whole footer from the file. It may be
@ -277,11 +279,21 @@ Status BlockBasedTable::Open(const Options& options,
}
}
// Initialize index/filter blocks. If block cache is not specified,
// these blocks will be kept in member variables in Rep, which will
// reside in the memory as long as this table object is alive; otherwise
// they will be added to block cache.
if (!options.block_cache) {
// Will use block cache for index/filter blocks access?
if (options.block_cache && table_options.cache_index_and_filter_blocks) {
// Call IndexBlockReader() to implicitly add index to the block_cache
unique_ptr<Iterator> iter(new_table->IndexBlockReader(ReadOptions()));
s = iter->status();
if (s.ok()) {
// Call GetFilter() to implicitly add filter to the block_cache
auto filter_entry = new_table->GetFilter();
filter_entry.Release(options.block_cache.get());
}
} else {
// If we don't use block cache for index/filter blocks access, we'll
// pre-load these blocks, which will kept in member variables in Rep
// and with a same life-time as this table object.
Block* index_block = nullptr;
// TODO: we never really verify check sum for index block
s = ReadBlockFromFile(
@ -309,18 +321,7 @@ Status BlockBasedTable::Open(const Options& options,
} else {
delete index_block;
}
} else {
// Call IndexBlockReader() to implicitly add index to the block_cache
unique_ptr<Iterator> iter(
new_table->IndexBlockReader(ReadOptions())
);
s = iter->status();
if (s.ok()) {
// Call GetFilter() to implicitly add filter to the block_cache
auto filter_entry = new_table->GetFilter();
filter_entry.Release(options.block_cache.get());
}
}
if (s.ok()) {
@ -836,7 +837,6 @@ BlockBasedTable::GetFilter(bool no_io) const {
// Get the iterator from the index block.
Iterator* BlockBasedTable::IndexBlockReader(const ReadOptions& options) const {
if (rep_->index_block) {
assert (!rep_->options.block_cache);
return rep_->index_block->NewIterator(rep_->options.comparator);
}

@ -29,6 +29,7 @@ struct ReadOptions;
class TableCache;
class TableReader;
class FilterBlockReader;
struct BlockBasedTableOptions;
using std::unique_ptr;
@ -50,10 +51,9 @@ class BlockBasedTable : public TableReader {
// to nullptr and returns a non-ok status.
//
// *file must remain live while this Table is in use.
static Status Open(const Options& options,
const EnvOptions& soptions,
unique_ptr<RandomAccessFile>&& file,
uint64_t file_size,
static Status Open(const Options& db_options, const EnvOptions& env_options,
const BlockBasedTableOptions& table_options,
unique_ptr<RandomAccessFile>&& file, uint64_t file_size,
unique_ptr<TableReader>* table_reader);
bool PrefixMayMatch(const Slice& internal_prefix) override;

@ -243,13 +243,12 @@ class BlockConstructor: public Constructor {
class BlockBasedTableConstructor: public Constructor {
public:
explicit BlockBasedTableConstructor(
const Comparator* cmp)
: Constructor(cmp) {
}
explicit BlockBasedTableConstructor(const Comparator* cmp)
: Constructor(cmp) {}
~BlockBasedTableConstructor() {
Reset();
}
virtual Status FinishImpl(const Options& options, const KVMap& data) {
Reset();
sink_.reset(new StringSink());
@ -277,7 +276,6 @@ class BlockBasedTableConstructor: public Constructor {
// Open the table
uniq_id_ = cur_uniq_id_++;
source_.reset(new StringSource(sink_->contents(), uniq_id_));
unique_ptr<TableFactory> table_factory;
return options.table_factory->GetTableReader(options, soptions,
std::move(source_),
sink_->contents().size(),
@ -979,6 +977,11 @@ TEST(TableTest, BlockCacheTest) {
options.create_if_missing = true;
options.statistics = CreateDBStatistics();
options.block_cache = NewLRUCache(1024);
// Enable the cache for index/filter blocks
BlockBasedTableOptions table_options;
table_options.cache_index_and_filter_blocks = true;
options.table_factory.reset(new BlockBasedTableFactory(table_options));
std::vector<std::string> keys;
KVMap kvmap;
@ -1292,7 +1295,6 @@ TEST(MemTableTest, Simple) {
delete memtable->Unref();
}
} // namespace rocksdb
int main(int argc, char** argv) {

@ -409,6 +409,9 @@ class ShardedLRUCache : public Cache {
virtual size_t GetCapacity() {
return capacity_;
}
virtual void DisownData() {
shard_ = nullptr;
}
};
} // end anonymous namespace

@ -1072,25 +1072,7 @@ void ReduceDBLevelsCommand::DoCommand() {
CloseDB();
EnvOptions soptions;
TableCache tc(db_path_, &opt, soptions, 10);
const InternalKeyComparator cmp(opt.comparator);
VersionSet versions(db_path_, &opt, soptions, &tc, &cmp);
std::vector<ColumnFamilyDescriptor> dummy;
dummy.push_back(ColumnFamilyDescriptor());
// We rely the VersionSet::Recover to tell us the internal data structures
// in the db. And the Recover() should never do any change (like LogAndApply)
// to the manifest file.
st = versions.Recover(dummy);
if (!st.ok()) {
exec_state_ = LDBCommandExecuteResult::FAILED(st.ToString());
return;
}
port::Mutex mu;
mu.Lock();
st = versions.ReduceNumberOfLevels(new_levels_, &mu);
mu.Unlock();
st = VersionSet::ReduceNumberOfLevels(db_path_, &opt, soptions, new_levels_);
if (!st.ok()) {
exec_state_ = LDBCommandExecuteResult::FAILED(st.ToString());
return;

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