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Fix race condition on options_file_number_ (#4780)

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Summary:
options_file_number_ must be written under db::mutex_ sine its read is protected by mutex_ in ::GetLiveFiles(). However currently it is written in ::RenameTempFileToOptionsFile() which according to its contract must be called without holding db::mutex_. The patch fixes the race condition by also acquitting the mutex_ before writing options_file_number_. Also it does that only if the rename of option file is successful.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4780

Differential Revision: D13461411

Pulled By: maysamyabandeh

fbshipit-source-id: 2d5bae96a1f3e969ef2505b737cf2d7ae749787b
This commit is contained in:
Maysam Yabandeh 2018-12-13 19:22:07 -08:00 committed by Facebook Github Bot
parent 4fce44fc8b
commit 349542332a
1 changed files with 6 additions and 2 deletions
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8
db/db_impl.cc
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@ -2863,11 +2863,15 @@ Status DBImpl::RenameTempFileToOptionsFile(const std::string& file_name) {
#ifndef ROCKSDB_LITE
Status s;
versions_->options_file_number_ = versions_->NewFileNumber();
uint64_t options_file_number = versions_->NewFileNumber();
std::string options_file_name =
OptionsFileName(GetName(), versions_->options_file_number_);
OptionsFileName(GetName(), options_file_number);
// Retry if the file name happen to conflict with an existing one.
s = GetEnv()->RenameFile(file_name, options_file_name);
if (s.ok()) {
InstrumentedMutexLock l(&mutex_);
versions_->options_file_number_ = options_file_number;
}
if (0 == disable_delete_obsolete_files_) {
DeleteObsoleteOptionsFiles();