2016-02-10 00:12:00 +01:00
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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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RangeSync not to sync last 1MB of the file
Summary:
From other ones' investigation:
"sync_file_range() behavior highly depends on kernel version and filesystem.
xfs does neighbor page flushing outside of the specified ranges. For example, sync_file_range(fd, 8192, 16384) does not only trigger flushing page #3 to #4, but also flushing many more dirty pages (i.e. up to page#16)... Ranges of the sync_file_range() should be far enough from write() offset (at least 1MB)."
Test Plan: make all check
Reviewers: igor, rven, kradhakrishnan, yhchiang, IslamAbdelRahman, anthony
Reviewed By: anthony
Subscribers: yoshinorim, MarkCallaghan, sumeet, domas, dhruba, leveldb, ljin
Differential Revision: https://reviews.facebook.net/D15807
2015-07-20 23:46:15 +02:00
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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#include <vector>
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#include "util/file_reader_writer.h"
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#include "util/random.h"
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#include "util/testharness.h"
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namespace rocksdb {
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class WritableFileWriterTest : public testing::Test {};
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const uint32_t kMb = 1 << 20;
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TEST_F(WritableFileWriterTest, RangeSync) {
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class FakeWF : public WritableFile {
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public:
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explicit FakeWF() : size_(0), last_synced_(0) {}
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~FakeWF() {}
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Status Append(const Slice& data) override {
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size_ += data.size();
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return Status::OK();
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}
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2015-09-11 18:57:02 +02:00
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virtual Status Truncate(uint64_t size) override {
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return Status::OK();
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}
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RangeSync not to sync last 1MB of the file
Summary:
From other ones' investigation:
"sync_file_range() behavior highly depends on kernel version and filesystem.
xfs does neighbor page flushing outside of the specified ranges. For example, sync_file_range(fd, 8192, 16384) does not only trigger flushing page #3 to #4, but also flushing many more dirty pages (i.e. up to page#16)... Ranges of the sync_file_range() should be far enough from write() offset (at least 1MB)."
Test Plan: make all check
Reviewers: igor, rven, kradhakrishnan, yhchiang, IslamAbdelRahman, anthony
Reviewed By: anthony
Subscribers: yoshinorim, MarkCallaghan, sumeet, domas, dhruba, leveldb, ljin
Differential Revision: https://reviews.facebook.net/D15807
2015-07-20 23:46:15 +02:00
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Status Close() override {
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EXPECT_GE(size_, last_synced_ + kMb);
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EXPECT_LT(size_, last_synced_ + 2 * kMb);
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// Make sure random writes generated enough writes.
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EXPECT_GT(size_, 10 * kMb);
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return Status::OK();
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}
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Status Flush() override { return Status::OK(); }
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Status Sync() override { return Status::OK(); }
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Status Fsync() override { return Status::OK(); }
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void SetIOPriority(Env::IOPriority pri) override {}
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uint64_t GetFileSize() override { return size_; }
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void GetPreallocationStatus(size_t* block_size,
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size_t* last_allocated_block) override {}
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size_t GetUniqueId(char* id, size_t max_size) const override { return 0; }
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Status InvalidateCache(size_t offset, size_t length) override {
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return Status::OK();
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}
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protected:
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2015-11-11 02:03:42 +01:00
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Status Allocate(uint64_t offset, uint64_t len) override { return Status::OK(); }
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Status RangeSync(uint64_t offset, uint64_t nbytes) override {
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RangeSync not to sync last 1MB of the file
Summary:
From other ones' investigation:
"sync_file_range() behavior highly depends on kernel version and filesystem.
xfs does neighbor page flushing outside of the specified ranges. For example, sync_file_range(fd, 8192, 16384) does not only trigger flushing page #3 to #4, but also flushing many more dirty pages (i.e. up to page#16)... Ranges of the sync_file_range() should be far enough from write() offset (at least 1MB)."
Test Plan: make all check
Reviewers: igor, rven, kradhakrishnan, yhchiang, IslamAbdelRahman, anthony
Reviewed By: anthony
Subscribers: yoshinorim, MarkCallaghan, sumeet, domas, dhruba, leveldb, ljin
Differential Revision: https://reviews.facebook.net/D15807
2015-07-20 23:46:15 +02:00
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EXPECT_EQ(offset % 4096, 0u);
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EXPECT_EQ(nbytes % 4096, 0u);
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EXPECT_EQ(offset, last_synced_);
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last_synced_ = offset + nbytes;
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EXPECT_GE(size_, last_synced_ + kMb);
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if (size_ > 2 * kMb) {
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EXPECT_LT(size_, last_synced_ + 2 * kMb);
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}
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return Status::OK();
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}
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uint64_t size_;
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uint64_t last_synced_;
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};
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EnvOptions env_options;
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env_options.bytes_per_sync = kMb;
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unique_ptr<FakeWF> wf(new FakeWF);
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unique_ptr<WritableFileWriter> writer(
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new WritableFileWriter(std::move(wf), env_options));
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Random r(301);
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std::unique_ptr<char[]> large_buf(new char[10 * kMb]);
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for (int i = 0; i < 1000; i++) {
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int skew_limit = (i < 700) ? 10 : 15;
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uint32_t num = r.Skewed(skew_limit) * 100 + r.Uniform(100);
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writer->Append(Slice(large_buf.get(), num));
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// Flush in a chance of 1/10.
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if (r.Uniform(10) == 0) {
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writer->Flush();
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}
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}
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writer->Close();
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}
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2015-10-28 05:04:00 +01:00
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TEST_F(WritableFileWriterTest, AppendStatusReturn) {
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class FakeWF : public WritableFile {
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public:
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explicit FakeWF() : use_os_buffer_(true), io_error_(false) {}
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virtual bool UseOSBuffer() const override { return use_os_buffer_; }
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Status Append(const Slice& data) override {
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if (io_error_) {
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return Status::IOError("Fake IO error");
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}
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return Status::OK();
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}
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Status PositionedAppend(const Slice& data, uint64_t) override {
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if (io_error_) {
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return Status::IOError("Fake IO error");
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}
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return Status::OK();
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}
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Status Close() override { return Status::OK(); }
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Status Flush() override { return Status::OK(); }
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Status Sync() override { return Status::OK(); }
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void SetUseOSBuffer(bool val) { use_os_buffer_ = val; }
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void SetIOError(bool val) { io_error_ = val; }
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protected:
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bool use_os_buffer_;
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bool io_error_;
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};
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unique_ptr<FakeWF> wf(new FakeWF());
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wf->SetUseOSBuffer(false);
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unique_ptr<WritableFileWriter> writer(
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new WritableFileWriter(std::move(wf), EnvOptions()));
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ASSERT_OK(writer->Append(std::string(2 * kMb, 'a')));
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// Next call to WritableFile::Append() should fail
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dynamic_cast<FakeWF*>(writer->writable_file())->SetIOError(true);
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ASSERT_NOK(writer->Append(std::string(2 * kMb, 'b')));
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}
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RangeSync not to sync last 1MB of the file
Summary:
From other ones' investigation:
"sync_file_range() behavior highly depends on kernel version and filesystem.
xfs does neighbor page flushing outside of the specified ranges. For example, sync_file_range(fd, 8192, 16384) does not only trigger flushing page #3 to #4, but also flushing many more dirty pages (i.e. up to page#16)... Ranges of the sync_file_range() should be far enough from write() offset (at least 1MB)."
Test Plan: make all check
Reviewers: igor, rven, kradhakrishnan, yhchiang, IslamAbdelRahman, anthony
Reviewed By: anthony
Subscribers: yoshinorim, MarkCallaghan, sumeet, domas, dhruba, leveldb, ljin
Differential Revision: https://reviews.facebook.net/D15807
2015-07-20 23:46:15 +02:00
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} // namespace rocksdb
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int main(int argc, char** argv) {
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::testing::InitGoogleTest(&argc, argv);
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return RUN_ALL_TESTS();
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}
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