Add a SystemClock class to capture the time functions of an Env (#7858)
Summary: Introduces and uses a SystemClock class to RocksDB. This class contains the time-related functions of an Env and these functions can be redirected from the Env to the SystemClock. Many of the places that used an Env (Timer, PerfStepTimer, RepeatableThread, RateLimiter, WriteController) for time-related functions have been changed to use SystemClock instead. There are likely more places that can be changed, but this is a start to show what can/should be done. Over time it would be nice to migrate most (if not all) of the uses of the time functions from the Env to the SystemClock. There are several Env classes that implement these functions. Most of these have not been converted yet to SystemClock implementations; that will come in a subsequent PR. It would be good to unify many of the Mock Timer implementations, so that they behave similarly and be tested similarly (some override Sleep, some use a MockSleep, etc). Additionally, this change will allow new methods to be introduced to the SystemClock (like https://github.com/facebook/rocksdb/issues/7101 WaitFor) in a consistent manner across a smaller number of classes. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7858 Reviewed By: pdillinger Differential Revision: D26006406 Pulled By: mrambacher fbshipit-source-id: ed10a8abbdab7ff2e23d69d85bd25b3e7e899e90main
mrambacher
4 years ago
committed by
Facebook GitHub Bot
parent
1d226018af
commit
12f1137355
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// Copyright (c) 2019-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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#include "env/composite_env_wrapper.h" |
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namespace ROCKSDB_NAMESPACE { |
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namespace { |
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// The CompositeEnvWrapper class provides an interface that is compatible
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// with the old monolithic Env API, and an implementation that wraps around
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// the new Env that provides threading and other OS related functionality, and
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// the new FileSystem API that provides storage functionality. By
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// providing the old Env interface, it allows the rest of RocksDB code to
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// be agnostic of whether the underlying Env implementation is a monolithic
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// Env or an Env + FileSystem. In the former case, the user will specify
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// Options::env only, whereas in the latter case, the user will specify
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// Options::env and Options::file_system.
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class CompositeSequentialFileWrapper : public SequentialFile { |
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public: |
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explicit CompositeSequentialFileWrapper( |
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std::unique_ptr<FSSequentialFile>& target) |
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: target_(std::move(target)) {} |
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Status Read(size_t n, Slice* result, char* scratch) override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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return target_->Read(n, io_opts, result, scratch, &dbg); |
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} |
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Status Skip(uint64_t n) override { return target_->Skip(n); } |
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bool use_direct_io() const override { return target_->use_direct_io(); } |
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size_t GetRequiredBufferAlignment() const override { |
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return target_->GetRequiredBufferAlignment(); |
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} |
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Status InvalidateCache(size_t offset, size_t length) override { |
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return target_->InvalidateCache(offset, length); |
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} |
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Status PositionedRead(uint64_t offset, size_t n, Slice* result, |
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char* scratch) override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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return target_->PositionedRead(offset, n, io_opts, result, scratch, &dbg); |
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} |
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private: |
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std::unique_ptr<FSSequentialFile> target_; |
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}; |
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class CompositeRandomAccessFileWrapper : public RandomAccessFile { |
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public: |
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explicit CompositeRandomAccessFileWrapper( |
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std::unique_ptr<FSRandomAccessFile>& target) |
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: target_(std::move(target)) {} |
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Status Read(uint64_t offset, size_t n, Slice* result, |
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char* scratch) const override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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return target_->Read(offset, n, io_opts, result, scratch, &dbg); |
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} |
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Status MultiRead(ReadRequest* reqs, size_t num_reqs) override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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std::vector<FSReadRequest> fs_reqs; |
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Status status; |
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fs_reqs.resize(num_reqs); |
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for (size_t i = 0; i < num_reqs; ++i) { |
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fs_reqs[i].offset = reqs[i].offset; |
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fs_reqs[i].len = reqs[i].len; |
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fs_reqs[i].scratch = reqs[i].scratch; |
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fs_reqs[i].status = IOStatus::OK(); |
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} |
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status = target_->MultiRead(fs_reqs.data(), num_reqs, io_opts, &dbg); |
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for (size_t i = 0; i < num_reqs; ++i) { |
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reqs[i].result = fs_reqs[i].result; |
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reqs[i].status = fs_reqs[i].status; |
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} |
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return status; |
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} |
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Status Prefetch(uint64_t offset, size_t n) override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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return target_->Prefetch(offset, n, io_opts, &dbg); |
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} |
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size_t GetUniqueId(char* id, size_t max_size) const override { |
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return target_->GetUniqueId(id, max_size); |
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} |
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void Hint(AccessPattern pattern) override { |
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target_->Hint((FSRandomAccessFile::AccessPattern)pattern); |
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} |
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bool use_direct_io() const override { return target_->use_direct_io(); } |
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size_t GetRequiredBufferAlignment() const override { |
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return target_->GetRequiredBufferAlignment(); |
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} |
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Status InvalidateCache(size_t offset, size_t length) override { |
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return target_->InvalidateCache(offset, length); |
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} |
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private: |
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std::unique_ptr<FSRandomAccessFile> target_; |
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}; |
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class CompositeWritableFileWrapper : public WritableFile { |
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public: |
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explicit CompositeWritableFileWrapper(std::unique_ptr<FSWritableFile>& t) |
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: target_(std::move(t)) {} |
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Status Append(const Slice& data) override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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return target_->Append(data, io_opts, &dbg); |
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} |
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Status PositionedAppend(const Slice& data, uint64_t offset) override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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return target_->PositionedAppend(data, offset, io_opts, &dbg); |
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} |
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Status Truncate(uint64_t size) override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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return target_->Truncate(size, io_opts, &dbg); |
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} |
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Status Close() override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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return target_->Close(io_opts, &dbg); |
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} |
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Status Flush() override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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return target_->Flush(io_opts, &dbg); |
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} |
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Status Sync() override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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return target_->Sync(io_opts, &dbg); |
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} |
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Status Fsync() override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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return target_->Fsync(io_opts, &dbg); |
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} |
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bool IsSyncThreadSafe() const override { return target_->IsSyncThreadSafe(); } |
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bool use_direct_io() const override { return target_->use_direct_io(); } |
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size_t GetRequiredBufferAlignment() const override { |
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return target_->GetRequiredBufferAlignment(); |
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} |
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void SetWriteLifeTimeHint(Env::WriteLifeTimeHint hint) override { |
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target_->SetWriteLifeTimeHint(hint); |
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} |
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Env::WriteLifeTimeHint GetWriteLifeTimeHint() override { |
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return target_->GetWriteLifeTimeHint(); |
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} |
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uint64_t GetFileSize() override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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return target_->GetFileSize(io_opts, &dbg); |
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} |
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void SetPreallocationBlockSize(size_t size) override { |
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target_->SetPreallocationBlockSize(size); |
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} |
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void GetPreallocationStatus(size_t* block_size, |
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size_t* last_allocated_block) override { |
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target_->GetPreallocationStatus(block_size, last_allocated_block); |
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} |
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size_t GetUniqueId(char* id, size_t max_size) const override { |
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return target_->GetUniqueId(id, max_size); |
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} |
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Status InvalidateCache(size_t offset, size_t length) override { |
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return target_->InvalidateCache(offset, length); |
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} |
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Status RangeSync(uint64_t offset, uint64_t nbytes) override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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return target_->RangeSync(offset, nbytes, io_opts, &dbg); |
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} |
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void PrepareWrite(size_t offset, size_t len) override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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target_->PrepareWrite(offset, len, io_opts, &dbg); |
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} |
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Status Allocate(uint64_t offset, uint64_t len) override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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return target_->Allocate(offset, len, io_opts, &dbg); |
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} |
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std::unique_ptr<FSWritableFile>* target() { return &target_; } |
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private: |
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std::unique_ptr<FSWritableFile> target_; |
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}; |
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class CompositeRandomRWFileWrapper : public RandomRWFile { |
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public: |
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explicit CompositeRandomRWFileWrapper(std::unique_ptr<FSRandomRWFile>& target) |
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: target_(std::move(target)) {} |
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bool use_direct_io() const override { return target_->use_direct_io(); } |
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size_t GetRequiredBufferAlignment() const override { |
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return target_->GetRequiredBufferAlignment(); |
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} |
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Status Write(uint64_t offset, const Slice& data) override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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return target_->Write(offset, data, io_opts, &dbg); |
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} |
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Status Read(uint64_t offset, size_t n, Slice* result, |
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char* scratch) const override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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return target_->Read(offset, n, io_opts, result, scratch, &dbg); |
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} |
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Status Flush() override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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return target_->Flush(io_opts, &dbg); |
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} |
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Status Sync() override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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return target_->Sync(io_opts, &dbg); |
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} |
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Status Fsync() override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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return target_->Fsync(io_opts, &dbg); |
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} |
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Status Close() override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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return target_->Close(io_opts, &dbg); |
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} |
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private: |
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std::unique_ptr<FSRandomRWFile> target_; |
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}; |
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class CompositeDirectoryWrapper : public Directory { |
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public: |
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explicit CompositeDirectoryWrapper(std::unique_ptr<FSDirectory>& target) |
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: target_(std::move(target)) {} |
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Status Fsync() override { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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return target_->Fsync(io_opts, &dbg); |
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} |
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size_t GetUniqueId(char* id, size_t max_size) const override { |
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return target_->GetUniqueId(id, max_size); |
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} |
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private: |
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std::unique_ptr<FSDirectory> target_; |
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}; |
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} // namespace
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Status CompositeEnv::NewSequentialFile(const std::string& f, |
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std::unique_ptr<SequentialFile>* r, |
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const EnvOptions& options) { |
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IODebugContext dbg; |
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std::unique_ptr<FSSequentialFile> file; |
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Status status; |
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status = |
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file_system_->NewSequentialFile(f, FileOptions(options), &file, &dbg); |
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if (status.ok()) { |
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r->reset(new CompositeSequentialFileWrapper(file)); |
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} |
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return status; |
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} |
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Status CompositeEnv::NewRandomAccessFile(const std::string& f, |
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std::unique_ptr<RandomAccessFile>* r, |
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const EnvOptions& options) { |
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IODebugContext dbg; |
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std::unique_ptr<FSRandomAccessFile> file; |
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Status status; |
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status = |
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file_system_->NewRandomAccessFile(f, FileOptions(options), &file, &dbg); |
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if (status.ok()) { |
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r->reset(new CompositeRandomAccessFileWrapper(file)); |
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} |
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return status; |
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} |
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Status CompositeEnv::NewWritableFile(const std::string& f, |
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std::unique_ptr<WritableFile>* r, |
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const EnvOptions& options) { |
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IODebugContext dbg; |
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std::unique_ptr<FSWritableFile> file; |
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Status status; |
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status = file_system_->NewWritableFile(f, FileOptions(options), &file, &dbg); |
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if (status.ok()) { |
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r->reset(new CompositeWritableFileWrapper(file)); |
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} |
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return status; |
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} |
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Status CompositeEnv::ReopenWritableFile(const std::string& fname, |
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std::unique_ptr<WritableFile>* result, |
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const EnvOptions& options) { |
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IODebugContext dbg; |
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Status status; |
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std::unique_ptr<FSWritableFile> file; |
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status = file_system_->ReopenWritableFile(fname, FileOptions(options), &file, |
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&dbg); |
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if (status.ok()) { |
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result->reset(new CompositeWritableFileWrapper(file)); |
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} |
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return status; |
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} |
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Status CompositeEnv::ReuseWritableFile(const std::string& fname, |
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const std::string& old_fname, |
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std::unique_ptr<WritableFile>* r, |
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const EnvOptions& options) { |
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IODebugContext dbg; |
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Status status; |
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std::unique_ptr<FSWritableFile> file; |
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status = file_system_->ReuseWritableFile(fname, old_fname, |
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FileOptions(options), &file, &dbg); |
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if (status.ok()) { |
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r->reset(new CompositeWritableFileWrapper(file)); |
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} |
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return status; |
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} |
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Status CompositeEnv::NewRandomRWFile(const std::string& fname, |
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std::unique_ptr<RandomRWFile>* result, |
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const EnvOptions& options) { |
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IODebugContext dbg; |
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std::unique_ptr<FSRandomRWFile> file; |
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Status status; |
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status = |
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file_system_->NewRandomRWFile(fname, FileOptions(options), &file, &dbg); |
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if (status.ok()) { |
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result->reset(new CompositeRandomRWFileWrapper(file)); |
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} |
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return status; |
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} |
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Status CompositeEnv::NewDirectory(const std::string& name, |
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std::unique_ptr<Directory>* result) { |
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IOOptions io_opts; |
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IODebugContext dbg; |
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std::unique_ptr<FSDirectory> dir; |
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Status status; |
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status = file_system_->NewDirectory(name, io_opts, &dir, &dbg); |
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if (status.ok()) { |
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result->reset(new CompositeDirectoryWrapper(dir)); |
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} |
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return status; |
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} |
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} // namespace ROCKSDB_NAMESPACE
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@ -0,0 +1,102 @@ |
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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#pragma once |
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#include <rocksdb/rocksdb_namespace.h> |
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#include <rocksdb/status.h> |
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#include <stdint.h> |
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#include <memory> |
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#ifdef _WIN32 |
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// Windows API macro interference
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#undef GetCurrentTime |
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#endif |
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namespace ROCKSDB_NAMESPACE { |
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struct ConfigOptions; |
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// A SystemClock is an interface used by the rocksdb implementation to access
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// operating system time-related functionality.
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class SystemClock { |
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public: |
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virtual ~SystemClock() {} |
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|
|
||||||
|
static const char* Type() { return "SystemClock"; } |
||||||
|
|
||||||
|
// The name of this system clock
|
||||||
|
virtual const char* Name() const = 0; |
||||||
|
|
||||||
|
// Return a default SystemClock suitable for the current operating
|
||||||
|
// system.
|
||||||
|
static const std::shared_ptr<SystemClock>& Default(); |
||||||
|
|
||||||
|
// Returns the number of micro-seconds since some fixed point in time.
|
||||||
|
// It is often used as system time such as in GenericRateLimiter
|
||||||
|
// and other places so a port needs to return system time in order to work.
|
||||||
|
virtual uint64_t NowMicros() = 0; |
||||||
|
|
||||||
|
// Returns the number of nano-seconds since some fixed point in time. Only
|
||||||
|
// useful for computing deltas of time in one run.
|
||||||
|
// Default implementation simply relies on NowMicros.
|
||||||
|
// In platform-specific implementations, NowNanos() should return time points
|
||||||
|
// that are MONOTONIC.
|
||||||
|
virtual uint64_t NowNanos() { return NowMicros() * 1000; } |
||||||
|
|
||||||
|
// Returns the number of micro-seconds of CPU time used by the current thread.
|
||||||
|
// 0 indicates not supported.
|
||||||
|
virtual uint64_t CPUMicros() { return 0; } |
||||||
|
|
||||||
|
// Returns the number of nano-seconds of CPU time used by the current thread.
|
||||||
|
// Default implementation simply relies on CPUMicros.
|
||||||
|
// 0 indicates not supported.
|
||||||
|
virtual uint64_t CPUNanos() { return CPUMicros() * 1000; } |
||||||
|
|
||||||
|
// Sleep/delay the thread for the prescribed number of micro-seconds.
|
||||||
|
virtual void SleepForMicroseconds(int micros) = 0; |
||||||
|
|
||||||
|
// Get the number of seconds since the Epoch, 1970-01-01 00:00:00 (UTC).
|
||||||
|
// Only overwrites *unix_time on success.
|
||||||
|
virtual Status GetCurrentTime(int64_t* unix_time) = 0; |
||||||
|
|
||||||
|
// Converts seconds-since-Jan-01-1970 to a printable string
|
||||||
|
virtual std::string TimeToString(uint64_t time) = 0; |
||||||
|
}; |
||||||
|
|
||||||
|
// Wrapper class for a SystemClock. Redirects all methods (except Name)
|
||||||
|
// of the SystemClock interface to the target/wrapped class.
|
||||||
|
class SystemClockWrapper : public SystemClock { |
||||||
|
public: |
||||||
|
explicit SystemClockWrapper(const std::shared_ptr<SystemClock>& t) |
||||||
|
: target_(t) {} |
||||||
|
|
||||||
|
uint64_t NowMicros() override { return target_->NowMicros(); } |
||||||
|
|
||||||
|
uint64_t NowNanos() override { return target_->NowNanos(); } |
||||||
|
|
||||||
|
uint64_t CPUMicros() override { return target_->CPUMicros(); } |
||||||
|
|
||||||
|
uint64_t CPUNanos() override { return target_->CPUNanos(); } |
||||||
|
|
||||||
|
virtual void SleepForMicroseconds(int micros) override { |
||||||
|
return target_->SleepForMicroseconds(micros); |
||||||
|
} |
||||||
|
|
||||||
|
Status GetCurrentTime(int64_t* unix_time) override { |
||||||
|
return target_->GetCurrentTime(unix_time); |
||||||
|
} |
||||||
|
|
||||||
|
std::string TimeToString(uint64_t time) override { |
||||||
|
return target_->TimeToString(time); |
||||||
|
} |
||||||
|
|
||||||
|
protected: |
||||||
|
std::shared_ptr<SystemClock> target_; |
||||||
|
}; |
||||||
|
|
||||||
|
} // end namespace ROCKSDB_NAMESPACE
|
||||||
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