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CF cleanup part 2

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This commit is contained in:
Igor Canadi 2014-03-12 18:09:03 -07:00
parent f071a20f6e
commit f0e1e3ebf1
3 changed files with 42 additions and 38 deletions
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72
db/version_set.cc
View File

@ -1489,12 +1489,11 @@ Status VersionSet::LogAndApply(ColumnFamilyData* column_family_data,
const ColumnFamilyOptions* options) {
mu->AssertHeld();
assert(column_family_data != nullptr || edit->is_column_family_add_);
if (edit->is_column_family_drop_) {
// if we drop column family, we have to make sure to save max column family,
// so that we don't reuse existing ID
edit->SetMaxColumnFamily(column_family_set_->GetMaxColumnFamily());
// column_family_data can be nullptr only if this is column_family_add.
// in that case, we also need to specify ColumnFamilyOptions
if (column_family_data == nullptr) {
assert(edit->is_column_family_add_);
assert(options != nullptr);
}
// queue our request
@ -1527,9 +1526,7 @@ Status VersionSet::LogAndApply(ColumnFamilyData* column_family_data,
assert(manifest_writers_.front() == &w);
if (edit->IsColumnFamilyManipulation()) {
// no group commits for column family add or drop
last_writer = &w;
edit->SetNextFile(next_file_number_);
edit->SetLastSequence(last_sequence_);
LogAndApplyCFHelper(edit);
batch_edits.push_back(edit);
} else {
v = new Version(column_family_data, this, current_version_number_++);
@ -1567,6 +1564,11 @@ Status VersionSet::LogAndApply(ColumnFamilyData* column_family_data,
if (new_descriptor_log) {
new_manifest_filename = DescriptorFileName(dbname_, manifest_file_number_);
edit->SetNextFile(next_file_number_);
// if we're writing out new snapshot make sure to persist max column
// family
if (column_family_set_->GetMaxColumnFamily() > 0) {
edit->SetMaxColumnFamily(column_family_set_->GetMaxColumnFamily());
}
}
// Unlock during expensive operations. New writes cannot get here
@ -1590,7 +1592,7 @@ Status VersionSet::LogAndApply(ColumnFamilyData* column_family_data,
// This is fine because everything inside of this block is serialized --
// only one thread can be here at the same time
if (!new_manifest_filename.empty()) {
if (new_descriptor_log) {
unique_ptr<WritableFile> descriptor_file;
s = env_->NewWritableFile(new_manifest_filename, &descriptor_file,
storage_options_.AdaptForLogWrite());
@ -1725,16 +1727,22 @@ Status VersionSet::LogAndApply(ColumnFamilyData* column_family_data,
return s;
}
void VersionSet::LogAndApplyCFHelper(VersionEdit* edit) {
assert(edit->IsColumnFamilyManipulation());
edit->SetNextFile(next_file_number_);
edit->SetLastSequence(last_sequence_);
if (edit->is_column_family_drop_) {
// if we drop column family, we have to make sure to save max column family,
// so that we don't reuse existing ID
edit->SetMaxColumnFamily(column_family_set_->GetMaxColumnFamily());
}
}
void VersionSet::LogAndApplyHelper(ColumnFamilyData* cfd, Builder* builder,
Version* v, VersionEdit* edit,
port::Mutex* mu) {
mu->AssertHeld();
if (!edit->has_prev_log_number_) {
edit->SetPrevLogNumber(prev_log_number_);
}
edit->SetNextFile(next_file_number_);
edit->SetLastSequence(last_sequence_);
assert(!edit->IsColumnFamilyManipulation());
if (edit->has_log_number_) {
assert(edit->log_number_ >= cfd->GetLogNumber());
@ -1743,6 +1751,12 @@ void VersionSet::LogAndApplyHelper(ColumnFamilyData* cfd, Builder* builder,
}
assert(edit->log_number_ < next_file_number_);
if (!edit->has_prev_log_number_) {
edit->SetPrevLogNumber(prev_log_number_);
}
edit->SetNextFile(next_file_number_);
edit->SetLastSequence(last_sequence_);
builder->Apply(edit);
}
@ -1806,17 +1820,16 @@ Status VersionSet::Recover(
std::unordered_map<uint32_t, Builder*> builders;
// add default column family
auto default_cf_iter = cf_name_to_options.find(default_column_family_name);
if (default_cf_iter == cf_name_to_options.end()) {
return Status::InvalidArgument("Default column family not specified");
}
VersionEdit default_cf_edit;
default_cf_edit.AddColumnFamily(default_column_family_name);
default_cf_edit.SetColumnFamily(0);
auto default_cf_iter = cf_name_to_options.find(default_column_family_name);
if (default_cf_iter == cf_name_to_options.end()) {
column_families_not_found.insert(0);
} else {
ColumnFamilyData* default_cfd =
CreateColumnFamily(default_cf_iter->second, &default_cf_edit);
builders.insert({0, new Builder(default_cfd)});
}
{
VersionSet::LogReporter reporter;
@ -2357,9 +2370,11 @@ void VersionSet::MarkFileNumberUsed(uint64_t number) {
Status VersionSet::WriteSnapshot(log::Writer* log) {
// TODO: Break up into multiple records to reduce memory usage on recovery?
// WARNING: This method doesn't hold a mutex!!
// This is done without DB mutex lock held, but only within single-threaded
// LogAndApply. Column family manipulations can only happen within LogAndApply
// (the same single thread), so we're safe
// (the same single thread), so we're safe to iterate.
for (auto cfd : *column_family_set_) {
{
// Store column family info
@ -2406,18 +2421,7 @@ Status VersionSet::WriteSnapshot(log::Writer* log) {
}
}
{
// persist max column family, last sequence and next file
VersionEdit edit;
if (column_family_set_->GetMaxColumnFamily() > 0) {
edit.SetMaxColumnFamily(column_family_set_->GetMaxColumnFamily());
}
edit.SetLastSequence(last_sequence_);
edit.SetNextFile(next_file_number_);
std::string record;
edit.EncodeTo(&record);
return log->AddRecord(record);
}
return Status::OK();
}
// Opens the mainfest file and reads all records

1
db/version_set.h
View File

@ -466,6 +466,7 @@ class VersionSet {
VersionSet(const VersionSet&);
void operator=(const VersionSet&);
void LogAndApplyCFHelper(VersionEdit* edit);
void LogAndApplyHelper(ColumnFamilyData* cfd, Builder* b, Version* v,
VersionEdit* edit, port::Mutex* mu);
};

1
db/write_batch.cc
View File

@ -177,7 +177,6 @@ void WriteBatch::Put(uint32_t column_family_id, const Slice& key,
const Slice& value) {
WriteBatchInternal::SetCount(this, WriteBatchInternal::Count(this) + 1);
if (column_family_id == 0) {
// save some data on disk by not writing default column family
rep_.push_back(static_cast<char>(kTypeValue));
} else {
rep_.push_back(static_cast<char>(kTypeColumnFamilyValue));