mirror of https://github.com/facebook/rocksdb.git
95 lines
2.8 KiB
C++
95 lines
2.8 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under both the GPLv2 (found in the
|
|
// COPYING file in the root directory) and Apache 2.0 License
|
|
// (found in the LICENSE.Apache file in the root directory).
|
|
|
|
#include "rocksdb/secondary_cache.h"
|
|
#include "util/random.h"
|
|
#include "util/thread_local.h"
|
|
|
|
namespace ROCKSDB_NAMESPACE {
|
|
|
|
// This class implements a custom SecondaryCache that randomly injects an
|
|
// error status into Inserts/Lookups based on a specified probability.
|
|
// Its used by db_stress to verify correctness in the presence of
|
|
// secondary cache errors.
|
|
//
|
|
class FaultInjectionSecondaryCache : public SecondaryCache {
|
|
public:
|
|
explicit FaultInjectionSecondaryCache(
|
|
const std::shared_ptr<SecondaryCache>& base, uint32_t seed, int prob)
|
|
: base_(base),
|
|
seed_(seed),
|
|
prob_(prob),
|
|
thread_local_error_(new ThreadLocalPtr(DeleteThreadLocalErrorContext)) {
|
|
}
|
|
|
|
virtual ~FaultInjectionSecondaryCache() override {}
|
|
|
|
const char* Name() const override { return "FaultInjectionSecondaryCache"; }
|
|
|
|
Status Insert(const Slice& key, void* value,
|
|
const Cache::CacheItemHelper* helper) override;
|
|
|
|
std::unique_ptr<SecondaryCacheResultHandle> Lookup(
|
|
const Slice& key, const Cache::CreateCallback& create_cb, bool wait,
|
|
bool& is_in_sec_cache) override;
|
|
|
|
void Erase(const Slice& /*key*/) override;
|
|
|
|
void WaitAll(std::vector<SecondaryCacheResultHandle*> handles) override;
|
|
|
|
std::string GetPrintableOptions() const override { return ""; }
|
|
|
|
void EnableErrorInjection(uint64_t prob);
|
|
|
|
private:
|
|
class ResultHandle : public SecondaryCacheResultHandle {
|
|
public:
|
|
ResultHandle(FaultInjectionSecondaryCache* cache,
|
|
std::unique_ptr<SecondaryCacheResultHandle>&& base)
|
|
: cache_(cache), base_(std::move(base)), value_(nullptr), size_(0) {}
|
|
|
|
~ResultHandle() override {}
|
|
|
|
bool IsReady() override;
|
|
|
|
void Wait() override;
|
|
|
|
void* Value() override;
|
|
|
|
size_t Size() override;
|
|
|
|
static void WaitAll(FaultInjectionSecondaryCache* cache,
|
|
std::vector<SecondaryCacheResultHandle*> handles);
|
|
|
|
private:
|
|
static void UpdateHandleValue(ResultHandle* handle);
|
|
|
|
FaultInjectionSecondaryCache* cache_;
|
|
std::unique_ptr<SecondaryCacheResultHandle> base_;
|
|
void* value_;
|
|
size_t size_;
|
|
};
|
|
|
|
static void DeleteThreadLocalErrorContext(void* p) {
|
|
ErrorContext* ctx = static_cast<ErrorContext*>(p);
|
|
delete ctx;
|
|
}
|
|
|
|
const std::shared_ptr<SecondaryCache> base_;
|
|
uint32_t seed_;
|
|
int prob_;
|
|
|
|
struct ErrorContext {
|
|
Random rand;
|
|
|
|
explicit ErrorContext(uint32_t seed) : rand(seed) {}
|
|
};
|
|
std::unique_ptr<ThreadLocalPtr> thread_local_error_;
|
|
|
|
ErrorContext* GetErrorContext();
|
|
};
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|