Fix race condition on options_file_number_ (#4780)
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
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@ -2863,11 +2863,15 @@ Status DBImpl::RenameTempFileToOptionsFile(const std::string& file_name) {
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#ifndef ROCKSDB_LITE
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Status s;
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versions_->options_file_number_ = versions_->NewFileNumber();
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uint64_t options_file_number = versions_->NewFileNumber();
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std::string options_file_name =
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OptionsFileName(GetName(), versions_->options_file_number_);
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OptionsFileName(GetName(), options_file_number);
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// Retry if the file name happen to conflict with an existing one.
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s = GetEnv()->RenameFile(file_name, options_file_name);
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if (s.ok()) {
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InstrumentedMutexLock l(&mutex_);
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versions_->options_file_number_ = options_file_number;
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}
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if (0 == disable_delete_obsolete_files_) {
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DeleteObsoleteOptionsFiles();
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