AshinGau commented on code in PR #16767:
URL: https://github.com/apache/doris/pull/16767#discussion_r1106726945
##########
be/src/io/cache/block/block_lru_file_cache.cpp:
##########
@@ -634,63 +637,113 @@ void LRUFileCache::remove(const Key& key, bool
is_persistent, size_t offset,
}
void LRUFileCache::load_cache_info_into_memory(std::lock_guard<std::mutex>&
cache_lock) {
+ /// version 1.0: cache_base_path / key / offset
+ /// version 2.0: cache_base_path / key_prefix / key / offset
+ if (read_file_cache_version() != FILE_CACHE_VERSION) {
+ // move directories format as version 2.0
+ fs::directory_iterator key_it {_cache_base_path};
+ for (; key_it != fs::directory_iterator(); ++key_it) {
+ if (key_it->is_directory()) {
+ std::string cache_key = key_it->path().filename().native();
+ if (cache_key.size() > KEY_PREFIX_LENGTH) {
+ std::string key_prefix =
+ fs::path(_cache_base_path) / cache_key.substr(0,
KEY_PREFIX_LENGTH);
+ if (!fs::exists(key_prefix)) {
+ std::error_code ec;
+ fs::create_directories(key_prefix, ec);
+ if (ec) {
+ LOG(WARNING) << "Failed to create new version
cached directory: "
+ << ec.message();
+ continue;
+ }
+ }
+ std::error_code ec;
+ std::filesystem::rename(key_it->path(), key_prefix /
cache_key, ec);
+ if (ec) {
+ LOG(WARNING)
+ << "Failed to move old version cached
directory: " << ec.message();
Review Comment:
Dirty data has been removed in the following process
`key_prefix_it->path().filename().native().size() != KEY_PREFIX_LENGTH`
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