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db_impl: recycle log files 

If log recycling is enabled, put old WAL files on a recycle queue instead of
deleting them.  When we need a new log file, take a recycled file off the
list if one is available.

Signed-off-by: Sage Weil <sage@redhat.com>
This commit is contained in:
Sage Weil 2015-10-01 09:12:04 -04:00
parent d666225a0a
commit 666376150c
2 changed files with 29 additions and 6 deletions
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33
db/db_impl.cc
View File

@ -605,7 +605,13 @@ void DBImpl::FindObsoleteFiles(JobContext* job_context, bool force,
// find newly obsoleted log files
while (alive_log_files_.begin()->number < min_log_number) {
auto& earliest = *alive_log_files_.begin();
job_context->log_delete_files.push_back(earliest.number);
if (db_options_.recycle_log_file_num > log_recycle_files.size()) {
Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
"adding log %" PRIu64 " to recycle list\n", earliest.number);
log_recycle_files.push_back(earliest.number);
} else {
job_context->log_delete_files.push_back(earliest.number);
}
total_log_size_ -= earliest.size;
alive_log_files_.pop_front();
// Current log should always stay alive since it can't have
@ -4076,6 +4082,12 @@ Status DBImpl::SwitchMemtable(ColumnFamilyData* cfd, WriteContext* context) {
// Do this without holding the dbmutex lock.
assert(versions_->prev_log_number() == 0);
bool creating_new_log = !log_empty_;
uint64_t recycle_log_number = 0;
if (creating_new_log && db_options_.recycle_log_file_num &&
!log_recycle_files.empty()) {
recycle_log_number = log_recycle_files.front();
log_recycle_files.pop_front();
}
uint64_t new_log_number =
creating_new_log ? versions_->NewFileNumber() : logfile_number_;
SuperVersion* new_superversion = nullptr;
@ -4086,14 +4098,23 @@ Status DBImpl::SwitchMemtable(ColumnFamilyData* cfd, WriteContext* context) {
if (creating_new_log) {
EnvOptions opt_env_opt =
env_->OptimizeForLogWrite(env_options_, db_options_);
s = NewWritableFile(env_,
LogFileName(db_options_.wal_dir, new_log_number),
&lfile, opt_env_opt);
if (recycle_log_number) {
Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
"reusing log %" PRIu64 " from recycle list\n", recycle_log_number);
s = env_->ReuseWritableFile(
LogFileName(db_options_.wal_dir, new_log_number),
LogFileName(db_options_.wal_dir, recycle_log_number), &lfile,
opt_env_opt);
} else {
s = NewWritableFile(env_,
LogFileName(db_options_.wal_dir, new_log_number),
&lfile, opt_env_opt);
}
if (s.ok()) {
// Our final size should be less than write_buffer_size
// (compression, etc) but err on the side of caution.
lfile->SetPreallocationBlockSize(
1.1 * mutable_cf_options.write_buffer_size);
lfile->SetPreallocationBlockSize(1.1 *
mutable_cf_options.write_buffer_size);
unique_ptr<WritableFileWriter> file_writer(
new WritableFileWriter(std::move(lfile), opt_env_opt));
new_log = new log::Writer(std::move(file_writer));

2
db/db_impl.h
View File

@ -556,6 +556,8 @@ class DBImpl : public DB {
// * whenever there is an error in background flush or compaction
InstrumentedCondVar bg_cv_;
uint64_t logfile_number_;
std::deque<uint64_t>
log_recycle_files; // a list of log files that we can recycle
bool log_dir_synced_;
bool log_empty_;
ColumnFamilyHandleImpl* default_cf_handle_;