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Use FSRandomRWFilePtr Object to call underlying file system. (#7198) 

Summary:
Replace FSRandomRWFile pointer with FSRandomRWFilePtr object in the rocksdb internal code.
This new object wraps FSRandomRWFile pointer.

Objective: If tracing is enabled, FSRandomRWFile object returns FSRandomRWFileTracingWrapper pointer that includes all necessary information in IORecord and calls underlying FileSystem and invokes IOTracer to dump that record in a binary file. If tracing is disabled then, underlying FileSystem pointer is returned directly.
FSRandomRWFilePtr wrapper class is added to bypass the FSRandomRWFileWrapper when
tracing is disabled.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7198

Test Plan: make check -j64

Reviewed By: anand1976

Differential Revision: D23421116

Pulled By: akankshamahajan15

fbshipit-source-id: 8a5ba0e7d9c1ba34c3a6f29829b107c5f09ab6a3
This commit is contained in:
Akanksha Mahajan 2020-09-08 12:20:20 -07:00 committed by Facebook GitHub Bot
parent 8a8a01c642
commit 0de335e076
2 changed files with 20 additions and 13 deletions
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7
db/external_sst_file_ingestion_job.cc
View File

@ -791,13 +791,14 @@ Status ExternalSstFileIngestionJob::AssignGlobalSeqnoForIngestedFile(
fs_->NewRandomRWFile(file_to_ingest->internal_file_path, env_options_,
&rwfile, nullptr);
if (status.ok()) {
FSRandomRWFilePtr fsptr(std::move(rwfile), io_tracer_);
std::string seqno_val;
PutFixed64(&seqno_val, seqno);
status = rwfile->Write(file_to_ingest->global_seqno_offset, seqno_val,
IOOptions(), nullptr);
status = fsptr->Write(file_to_ingest->global_seqno_offset, seqno_val,
IOOptions(), nullptr);
if (status.ok()) {
TEST_SYNC_POINT("ExternalSstFileIngestionJob::BeforeSyncGlobalSeqno");
status = SyncIngestedFile(rwfile.get());
status = SyncIngestedFile(fsptr.get());
TEST_SYNC_POINT("ExternalSstFileIngestionJob::AfterSyncGlobalSeqno");
if (!status.ok()) {
ROCKS_LOG_WARN(db_options_.info_log,

26
env/file_system_tracer.h vendored
View File

@ -337,26 +337,32 @@ class FSRandomRWFileTracingWrapper : public FSRandomRWFileWrapper {
// FSRandomRWFileTracingWrapper when tracing is disabled.
class FSRandomRWFilePtr {
public:
FSRandomRWFilePtr(FSRandomRWFile* fs, std::shared_ptr<IOTracer> io_tracer)
: fs_(fs),
FSRandomRWFilePtr(std::unique_ptr<FSRandomRWFile>&& fs,
std::shared_ptr<IOTracer> io_tracer)
: fs_(std::move(fs)),
io_tracer_(io_tracer),
fs_tracer_(new FSRandomRWFileTracingWrapper(fs_, io_tracer_)) {}
explicit FSRandomRWFilePtr(FSRandomRWFile* fs)
: fs_(fs), io_tracer_(nullptr), fs_tracer_(nullptr) {}
fs_tracer_(fs_.get(), io_tracer_) {}
FSRandomRWFile* operator->() const {
if (io_tracer_ && io_tracer_->is_tracing_enabled()) {
return fs_tracer_;
return const_cast<FSRandomRWFileTracingWrapper*>(&fs_tracer_);
} else {
return fs_;
return fs_.get();
}
}
FSRandomRWFile* get() const {
if (io_tracer_ && io_tracer_->is_tracing_enabled()) {
return const_cast<FSRandomRWFileTracingWrapper*>(&fs_tracer_);
} else {
return fs_.get();
}
}
private:
FSRandomRWFile* fs_;
std::unique_ptr<FSRandomRWFile> fs_;
std::shared_ptr<IOTracer> io_tracer_;
FSRandomRWFileTracingWrapper* fs_tracer_;
FSRandomRWFileTracingWrapper fs_tracer_;
};
} // namespace ROCKSDB_NAMESPACE