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rocksdb/file/delete_scheduler_test.cc
mrambacher e628f59e87 Create a CustomEnv class; Add WinFileSystem; Make LegacyFileSystemWrapper private (#7703) 
Summary:
This PR does the following:
-> Creates a WinFileSystem class.  This class is the Windows equivalent of the PosixFileSystem and will be used on Windows systems.
-> Introduces a CustomEnv class.  A CustomEnv is an Env that takes a FileSystem as constructor argument.  I believe there will only ever be two implementations of this class (PosixEnv and WinEnv).  There is still a CustomEnvWrapper class that takes an Env and a FileSystem and wraps the Env calls with the input Env but uses the FileSystem for the FileSystem calls
-> Eliminates the public uses of the LegacyFileSystemWrapper.

With this change in place, there are effectively the following patterns of Env:
- "Base Env classes" (PosixEnv, WinEnv).  These classes implement the core Env functions (e.g. Threads) and have a hard-coded input FileSystem.  These classes inherit from CompositeEnv, implement the core Env functions (threads) and delegate the FileSystem-like calls to the input file system.
- Wrapped Composite Env classes (MemEnv).  These classes take in an Env and a FileSystem.  The core env functions are re-directed to the wrapped env.  The file system calls are redirected to the input file system
- Legacy Wrapped Env classes.  These classes take in an Env input (but no FileSystem).  The core env functions are re-directed to the wrapped env.  A "Legacy File System" is created using this env and the file system calls directed to the env itself.

With these changes in place, the PosixEnv becomes a singleton -- there is only ever one created.  Any other use of the PosixEnv is via another wrapped env.  This cleans up some of the issues with the env construction and destruction.

Additionally, there were places in the code that required had an Env when they required a FileSystem.  Many of these places would wrap the Env with a LegacyFileSystemWrapper instead of using the env->GetFileSystem().  These places were changed, thereby removing layers of additional redirection (LegacyFileSystem --> Env --> Env::FileSystem).

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7703

Reviewed By: zhichao-cao

Differential Revision: D25762190

Pulled By: anand1976

fbshipit-source-id: 1a088e97fc916f28ac69c149cd1dcad0ab31704b
2021-01-06 10:49:32 -08:00

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// 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 "file/delete_scheduler.h"
#include <atomic>
#include <cinttypes>
#include <thread>
#include <vector>
#include "file/file_util.h"
#include "file/sst_file_manager_impl.h"
#include "rocksdb/env.h"
#include "rocksdb/options.h"
#include "test_util/sync_point.h"
#include "test_util/testharness.h"
#include "util/string_util.h"
#ifndef ROCKSDB_LITE
namespace ROCKSDB_NAMESPACE {
class DeleteSchedulerTest : public testing::Test {
public:
DeleteSchedulerTest() : env_(Env::Default()) {
const int kNumDataDirs = 3;
dummy_files_dirs_.reserve(kNumDataDirs);
for (size_t i = 0; i < kNumDataDirs; ++i) {
dummy_files_dirs_.emplace_back(
test::PerThreadDBPath(env_, "delete_scheduler_dummy_data_dir") +
ToString(i));
DestroyAndCreateDir(dummy_files_dirs_.back());
}
stats_ = ROCKSDB_NAMESPACE::CreateDBStatistics();
}
~DeleteSchedulerTest() override {
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency({});
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearAllCallBacks();
for (const auto& dummy_files_dir : dummy_files_dirs_) {
DestroyDir(env_, dummy_files_dir);
}
}
void DestroyAndCreateDir(const std::string& dir) {
ASSERT_OK(DestroyDir(env_, dir));
EXPECT_OK(env_->CreateDir(dir));
}
int CountNormalFiles(size_t dummy_files_dirs_idx = 0) {
std::vector<std::string> files_in_dir;
EXPECT_OK(env_->GetChildren(dummy_files_dirs_[dummy_files_dirs_idx],
&files_in_dir));
int normal_cnt = 0;
for (auto& f : files_in_dir) {
if (!DeleteScheduler::IsTrashFile(f) && f != "." && f != "..") {
normal_cnt++;
}
}
return normal_cnt;
}
int CountTrashFiles(size_t dummy_files_dirs_idx = 0) {
std::vector<std::string> files_in_dir;
EXPECT_OK(env_->GetChildren(dummy_files_dirs_[dummy_files_dirs_idx],
&files_in_dir));
int trash_cnt = 0;
for (auto& f : files_in_dir) {
if (DeleteScheduler::IsTrashFile(f)) {
trash_cnt++;
}
}
return trash_cnt;
}
std::string NewDummyFile(const std::string& file_name, uint64_t size = 1024,
size_t dummy_files_dirs_idx = 0) {
std::string file_path =
dummy_files_dirs_[dummy_files_dirs_idx] + "/" + file_name;
std::unique_ptr<WritableFile> f;
env_->NewWritableFile(file_path, &f, EnvOptions());
std::string data(size, 'A');
EXPECT_OK(f->Append(data));
EXPECT_OK(f->Close());
sst_file_mgr_->OnAddFile(file_path, false);
return file_path;
}
void NewDeleteScheduler() {
// Tests in this file are for DeleteScheduler component and don't create any
// DBs, so we need to set max_trash_db_ratio to 100% (instead of default
// 25%)
sst_file_mgr_.reset(new SstFileManagerImpl(
env_, env_->GetFileSystem(), nullptr, rate_bytes_per_sec_,
/* max_trash_db_ratio= */ 1.1, 128 * 1024));
delete_scheduler_ = sst_file_mgr_->delete_scheduler();
sst_file_mgr_->SetStatisticsPtr(stats_);
}
Env* env_;
std::vector<std::string> dummy_files_dirs_;
int64_t rate_bytes_per_sec_;
DeleteScheduler* delete_scheduler_;
std::unique_ptr<SstFileManagerImpl> sst_file_mgr_;
std::shared_ptr<Statistics> stats_;
};
// Test the basic functionality of DeleteScheduler (Rate Limiting).
// 1- Create 100 dummy files
// 2- Delete the 100 dummy files using DeleteScheduler
// --- Hold DeleteScheduler::BackgroundEmptyTrash ---
// 3- Wait for DeleteScheduler to delete all files in trash
// 4- Verify that BackgroundEmptyTrash used to correct penlties for the files
// 5- Make sure that all created files were completely deleted
TEST_F(DeleteSchedulerTest, BasicRateLimiting) {
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency({
{"DeleteSchedulerTest::BasicRateLimiting:1",
"DeleteScheduler::BackgroundEmptyTrash"},
});
std::vector<uint64_t> penalties;
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
"DeleteScheduler::BackgroundEmptyTrash:Wait",
[&](void* arg) { penalties.push_back(*(static_cast<uint64_t*>(arg))); });
int dir_synced = 0;
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
"DeleteScheduler::DeleteTrashFile::AfterSyncDir", [&](void* arg) {
dir_synced++;
std::string* dir = reinterpret_cast<std::string*>(arg);
EXPECT_EQ(dummy_files_dirs_[0], *dir);
});
int num_files = 100; // 100 files
uint64_t file_size = 1024; // every file is 1 kb
std::vector<uint64_t> delete_kbs_per_sec = {512, 200, 100, 50, 25};
for (size_t t = 0; t < delete_kbs_per_sec.size(); t++) {
penalties.clear();
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearTrace();
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
DestroyAndCreateDir(dummy_files_dirs_[0]);
rate_bytes_per_sec_ = delete_kbs_per_sec[t] * 1024;
NewDeleteScheduler();
dir_synced = 0;
// Create 100 dummy files, every file is 1 Kb
std::vector<std::string> generated_files;
for (int i = 0; i < num_files; i++) {
std::string file_name = "file" + ToString(i) + ".data";
generated_files.push_back(NewDummyFile(file_name, file_size));
}
// Delete dummy files and measure time spent to empty trash
for (int i = 0; i < num_files; i++) {
ASSERT_OK(delete_scheduler_->DeleteFile(generated_files[i],
dummy_files_dirs_[0]));
}
ASSERT_EQ(CountNormalFiles(), 0);
uint64_t delete_start_time = env_->NowMicros();
TEST_SYNC_POINT("DeleteSchedulerTest::BasicRateLimiting:1");
delete_scheduler_->WaitForEmptyTrash();
uint64_t time_spent_deleting = env_->NowMicros() - delete_start_time;
auto bg_errors = delete_scheduler_->GetBackgroundErrors();
ASSERT_EQ(bg_errors.size(), 0);
uint64_t total_files_size = 0;
uint64_t expected_penlty = 0;
ASSERT_EQ(penalties.size(), num_files);
for (int i = 0; i < num_files; i++) {
total_files_size += file_size;
expected_penlty = ((total_files_size * 1000000) / rate_bytes_per_sec_);
ASSERT_EQ(expected_penlty, penalties[i]);
}
ASSERT_GT(time_spent_deleting, expected_penlty * 0.9);
ASSERT_EQ(num_files, dir_synced);
ASSERT_EQ(CountTrashFiles(), 0);
ASSERT_EQ(num_files, stats_->getAndResetTickerCount(FILES_MARKED_TRASH));
ASSERT_EQ(0, stats_->getAndResetTickerCount(FILES_DELETED_IMMEDIATELY));
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
}
}
TEST_F(DeleteSchedulerTest, MultiDirectoryDeletionsScheduled) {
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency({
{"DeleteSchedulerTest::MultiDbPathDeletionsScheduled:1",
"DeleteScheduler::BackgroundEmptyTrash"},
});
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
rate_bytes_per_sec_ = 1 << 20; // 1MB
NewDeleteScheduler();
// Generate dummy files in multiple directories
const size_t kNumFiles = dummy_files_dirs_.size();
const size_t kFileSize = 1 << 10; // 1KB
std::vector<std::string> generated_files;
for (size_t i = 0; i < kNumFiles; i++) {
generated_files.push_back(NewDummyFile("file", kFileSize, i));
ASSERT_EQ(1, CountNormalFiles(i));
}
// Mark dummy files as trash
for (size_t i = 0; i < kNumFiles; i++) {
ASSERT_OK(delete_scheduler_->DeleteFile(generated_files[i], ""));
ASSERT_EQ(0, CountNormalFiles(i));
ASSERT_EQ(1, CountTrashFiles(i));
}
TEST_SYNC_POINT("DeleteSchedulerTest::MultiDbPathDeletionsScheduled:1");
delete_scheduler_->WaitForEmptyTrash();
// Verify dummy files eventually got deleted
for (size_t i = 0; i < kNumFiles; i++) {
ASSERT_EQ(0, CountNormalFiles(i));
ASSERT_EQ(0, CountTrashFiles(i));
}
ASSERT_EQ(kNumFiles, stats_->getAndResetTickerCount(FILES_MARKED_TRASH));
ASSERT_EQ(0, stats_->getAndResetTickerCount(FILES_DELETED_IMMEDIATELY));
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
}
// Same as the BasicRateLimiting test but delete files in multiple threads.
// 1- Create 100 dummy files
// 2- Delete the 100 dummy files using DeleteScheduler using 10 threads
// --- Hold DeleteScheduler::BackgroundEmptyTrash ---
// 3- Wait for DeleteScheduler to delete all files in queue
// 4- Verify that BackgroundEmptyTrash used to correct penlties for the files
// 5- Make sure that all created files were completely deleted
TEST_F(DeleteSchedulerTest, RateLimitingMultiThreaded) {
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency({
{"DeleteSchedulerTest::RateLimitingMultiThreaded:1",
"DeleteScheduler::BackgroundEmptyTrash"},
});
std::vector<uint64_t> penalties;
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
"DeleteScheduler::BackgroundEmptyTrash:Wait",
[&](void* arg) { penalties.push_back(*(static_cast<uint64_t*>(arg))); });
int thread_cnt = 10;
int num_files = 10; // 10 files per thread
uint64_t file_size = 1024; // every file is 1 kb
std::vector<uint64_t> delete_kbs_per_sec = {512, 200, 100, 50, 25};
for (size_t t = 0; t < delete_kbs_per_sec.size(); t++) {
penalties.clear();
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearTrace();
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
DestroyAndCreateDir(dummy_files_dirs_[0]);
rate_bytes_per_sec_ = delete_kbs_per_sec[t] * 1024;
NewDeleteScheduler();
// Create 100 dummy files, every file is 1 Kb
std::vector<std::string> generated_files;
for (int i = 0; i < num_files * thread_cnt; i++) {
std::string file_name = "file" + ToString(i) + ".data";
generated_files.push_back(NewDummyFile(file_name, file_size));
}
// Delete dummy files using 10 threads and measure time spent to empty trash
std::atomic<int> thread_num(0);
std::vector<port::Thread> threads;
std::function<void()> delete_thread = [&]() {
int idx = thread_num.fetch_add(1);
int range_start = idx * num_files;
int range_end = range_start + num_files;
for (int j = range_start; j < range_end; j++) {
ASSERT_OK(delete_scheduler_->DeleteFile(generated_files[j], ""));
}
};
for (int i = 0; i < thread_cnt; i++) {
threads.emplace_back(delete_thread);
}
for (size_t i = 0; i < threads.size(); i++) {
threads[i].join();
}
uint64_t delete_start_time = env_->NowMicros();
TEST_SYNC_POINT("DeleteSchedulerTest::RateLimitingMultiThreaded:1");
delete_scheduler_->WaitForEmptyTrash();
uint64_t time_spent_deleting = env_->NowMicros() - delete_start_time;
auto bg_errors = delete_scheduler_->GetBackgroundErrors();
ASSERT_EQ(bg_errors.size(), 0);
uint64_t total_files_size = 0;
uint64_t expected_penlty = 0;
ASSERT_EQ(penalties.size(), num_files * thread_cnt);
for (int i = 0; i < num_files * thread_cnt; i++) {
total_files_size += file_size;
expected_penlty = ((total_files_size * 1000000) / rate_bytes_per_sec_);
ASSERT_EQ(expected_penlty, penalties[i]);
}
ASSERT_GT(time_spent_deleting, expected_penlty * 0.9);
ASSERT_EQ(CountNormalFiles(), 0);
ASSERT_EQ(CountTrashFiles(), 0);
ASSERT_EQ(num_files * thread_cnt,
stats_->getAndResetTickerCount(FILES_MARKED_TRASH));
ASSERT_EQ(0, stats_->getAndResetTickerCount(FILES_DELETED_IMMEDIATELY));
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
}
}
// Disable rate limiting by setting rate_bytes_per_sec_ to 0 and make sure
// that when DeleteScheduler delete a file it delete it immediately and don't
// move it to trash
TEST_F(DeleteSchedulerTest, DisableRateLimiting) {
int bg_delete_file = 0;
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
"DeleteScheduler::DeleteTrashFile:DeleteFile",
[&](void* /*arg*/) { bg_delete_file++; });
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
rate_bytes_per_sec_ = 0;
NewDeleteScheduler();
constexpr int num_files = 10;
for (int i = 0; i < num_files; i++) {
// Every file we delete will be deleted immediately
std::string dummy_file = NewDummyFile("dummy.data");
ASSERT_OK(delete_scheduler_->DeleteFile(dummy_file, ""));
ASSERT_TRUE(env_->FileExists(dummy_file).IsNotFound());
ASSERT_EQ(CountNormalFiles(), 0);
ASSERT_EQ(CountTrashFiles(), 0);
}
ASSERT_EQ(bg_delete_file, 0);
ASSERT_EQ(0, stats_->getAndResetTickerCount(FILES_MARKED_TRASH));
ASSERT_EQ(num_files,
stats_->getAndResetTickerCount(FILES_DELETED_IMMEDIATELY));
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
}
// Testing that moving files to trash with the same name is not a problem
// 1- Create 10 files with the same name "conflict.data"
// 2- Delete the 10 files using DeleteScheduler
// 3- Make sure that trash directory contain 10 files ("conflict.data" x 10)
// --- Hold DeleteScheduler::BackgroundEmptyTrash ---
// 4- Make sure that files are deleted from trash
TEST_F(DeleteSchedulerTest, ConflictNames) {
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency({
{"DeleteSchedulerTest::ConflictNames:1",
"DeleteScheduler::BackgroundEmptyTrash"},
});
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
rate_bytes_per_sec_ = 1024 * 1024; // 1 Mb/sec
NewDeleteScheduler();
// Create "conflict.data" and move it to trash 10 times
for (int i = 0; i < 10; i++) {
std::string dummy_file = NewDummyFile("conflict.data");
ASSERT_OK(delete_scheduler_->DeleteFile(dummy_file, ""));
}
ASSERT_EQ(CountNormalFiles(), 0);
// 10 files ("conflict.data" x 10) in trash
ASSERT_EQ(CountTrashFiles(), 10);
// Hold BackgroundEmptyTrash
TEST_SYNC_POINT("DeleteSchedulerTest::ConflictNames:1");
delete_scheduler_->WaitForEmptyTrash();
ASSERT_EQ(CountTrashFiles(), 0);
auto bg_errors = delete_scheduler_->GetBackgroundErrors();
ASSERT_EQ(bg_errors.size(), 0);
ASSERT_EQ(10, stats_->getAndResetTickerCount(FILES_MARKED_TRASH));
ASSERT_EQ(0, stats_->getAndResetTickerCount(FILES_DELETED_IMMEDIATELY));
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
}
// 1- Create 10 dummy files
// 2- Delete the 10 files using DeleteScheduler (move them to trsah)
// 3- Delete the 10 files directly (using env_->DeleteFile)
// --- Hold DeleteScheduler::BackgroundEmptyTrash ---
// 4- Make sure that DeleteScheduler failed to delete the 10 files and
// reported 10 background errors
TEST_F(DeleteSchedulerTest, BackgroundError) {
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency({
{"DeleteSchedulerTest::BackgroundError:1",
"DeleteScheduler::BackgroundEmptyTrash"},
});
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
rate_bytes_per_sec_ = 1024 * 1024; // 1 Mb/sec
NewDeleteScheduler();
// Generate 10 dummy files and move them to trash
for (int i = 0; i < 10; i++) {
std::string file_name = "data_" + ToString(i) + ".data";
ASSERT_OK(delete_scheduler_->DeleteFile(NewDummyFile(file_name), ""));
}
ASSERT_EQ(CountNormalFiles(), 0);
ASSERT_EQ(CountTrashFiles(), 10);
// Delete 10 files from trash, this will cause background errors in
// BackgroundEmptyTrash since we already deleted the files it was
// goind to delete
for (int i = 0; i < 10; i++) {
std::string file_name = "data_" + ToString(i) + ".data.trash";
ASSERT_OK(env_->DeleteFile(dummy_files_dirs_[0] + "/" + file_name));
}
// Hold BackgroundEmptyTrash
TEST_SYNC_POINT("DeleteSchedulerTest::BackgroundError:1");
delete_scheduler_->WaitForEmptyTrash();
auto bg_errors = delete_scheduler_->GetBackgroundErrors();
ASSERT_EQ(bg_errors.size(), 10);
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
}
// 1- Create 10 dummy files
// 2- Delete 10 dummy files using DeleteScheduler
// 3- Wait for DeleteScheduler to delete all files in queue
// 4- Make sure all files in trash directory were deleted
// 5- Repeat previous steps 5 times
TEST_F(DeleteSchedulerTest, StartBGEmptyTrashMultipleTimes) {
int bg_delete_file = 0;
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
"DeleteScheduler::DeleteTrashFile:DeleteFile",
[&](void* /*arg*/) { bg_delete_file++; });
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
rate_bytes_per_sec_ = 1024 * 1024; // 1 MB / sec
NewDeleteScheduler();
// Move files to trash, wait for empty trash, start again
for (int run = 1; run <= 5; run++) {
// Generate 10 dummy files and move them to trash
for (int i = 0; i < 10; i++) {
std::string file_name = "data_" + ToString(i) + ".data";
ASSERT_OK(delete_scheduler_->DeleteFile(NewDummyFile(file_name), ""));
}
ASSERT_EQ(CountNormalFiles(), 0);
delete_scheduler_->WaitForEmptyTrash();
ASSERT_EQ(bg_delete_file, 10 * run);
ASSERT_EQ(CountTrashFiles(), 0);
auto bg_errors = delete_scheduler_->GetBackgroundErrors();
ASSERT_EQ(bg_errors.size(), 0);
ASSERT_EQ(10, stats_->getAndResetTickerCount(FILES_MARKED_TRASH));
ASSERT_EQ(0, stats_->getAndResetTickerCount(FILES_DELETED_IMMEDIATELY));
}
ASSERT_EQ(bg_delete_file, 50);
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
}
TEST_F(DeleteSchedulerTest, DeletePartialFile) {
int bg_delete_file = 0;
int bg_fsync = 0;
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
"DeleteScheduler::DeleteTrashFile:DeleteFile",
[&](void*) { bg_delete_file++; });
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
"DeleteScheduler::DeleteTrashFile:Fsync", [&](void*) { bg_fsync++; });
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
rate_bytes_per_sec_ = 1024 * 1024; // 1 MB / sec
NewDeleteScheduler();
// Should delete in 4 batch
ASSERT_OK(
delete_scheduler_->DeleteFile(NewDummyFile("data_1", 500 * 1024), ""));
ASSERT_OK(
delete_scheduler_->DeleteFile(NewDummyFile("data_2", 100 * 1024), ""));
// Should delete in 2 batch
ASSERT_OK(
delete_scheduler_->DeleteFile(NewDummyFile("data_2", 200 * 1024), ""));
delete_scheduler_->WaitForEmptyTrash();
auto bg_errors = delete_scheduler_->GetBackgroundErrors();
ASSERT_EQ(bg_errors.size(), 0);
ASSERT_EQ(7, bg_delete_file);
ASSERT_EQ(4, bg_fsync);
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
}
#ifdef OS_LINUX
TEST_F(DeleteSchedulerTest, NoPartialDeleteWithLink) {
int bg_delete_file = 0;
int bg_fsync = 0;
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
"DeleteScheduler::DeleteTrashFile:DeleteFile",
[&](void*) { bg_delete_file++; });
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
"DeleteScheduler::DeleteTrashFile:Fsync", [&](void*) { bg_fsync++; });
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
rate_bytes_per_sec_ = 1024 * 1024; // 1 MB / sec
NewDeleteScheduler();
std::string file1 = NewDummyFile("data_1", 500 * 1024);
std::string file2 = NewDummyFile("data_2", 100 * 1024);
ASSERT_OK(env_->LinkFile(file1, dummy_files_dirs_[0] + "/data_1b"));
ASSERT_OK(env_->LinkFile(file2, dummy_files_dirs_[0] + "/data_2b"));
// Should delete in 4 batch if there is no hardlink
ASSERT_OK(delete_scheduler_->DeleteFile(file1, ""));
ASSERT_OK(delete_scheduler_->DeleteFile(file2, ""));
delete_scheduler_->WaitForEmptyTrash();
auto bg_errors = delete_scheduler_->GetBackgroundErrors();
ASSERT_EQ(bg_errors.size(), 0);
ASSERT_EQ(2, bg_delete_file);
ASSERT_EQ(0, bg_fsync);
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
}
#endif
// 1- Create a DeleteScheduler with very slow rate limit (1 Byte / sec)
// 2- Delete 100 files using DeleteScheduler
// 3- Delete the DeleteScheduler (call the destructor while queue is not empty)
// 4- Make sure that not all files were deleted from trash and that
// DeleteScheduler background thread did not delete all files
TEST_F(DeleteSchedulerTest, DestructorWithNonEmptyQueue) {
int bg_delete_file = 0;
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
"DeleteScheduler::DeleteTrashFile:DeleteFile",
[&](void* /*arg*/) { bg_delete_file++; });
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
rate_bytes_per_sec_ = 1; // 1 Byte / sec
NewDeleteScheduler();
for (int i = 0; i < 100; i++) {
std::string file_name = "data_" + ToString(i) + ".data";
ASSERT_OK(delete_scheduler_->DeleteFile(NewDummyFile(file_name), ""));
}
// Deleting 100 files will need >28 hours to delete
// we will delete the DeleteScheduler while delete queue is not empty
sst_file_mgr_.reset();
ASSERT_LT(bg_delete_file, 100);
ASSERT_GT(CountTrashFiles(), 0);
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
}
TEST_F(DeleteSchedulerTest, DISABLED_DynamicRateLimiting1) {
std::vector<uint64_t> penalties;
int bg_delete_file = 0;
int fg_delete_file = 0;
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
"DeleteScheduler::DeleteTrashFile:DeleteFile",
[&](void* /*arg*/) { bg_delete_file++; });
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
"DeleteScheduler::DeleteFile", [&](void* /*arg*/) { fg_delete_file++; });
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
"DeleteScheduler::BackgroundEmptyTrash:Wait",
[&](void* arg) { penalties.push_back(*(static_cast<int*>(arg))); });
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->LoadDependency({
{"DeleteSchedulerTest::DynamicRateLimiting1:1",
"DeleteScheduler::BackgroundEmptyTrash"},
});
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
rate_bytes_per_sec_ = 0; // Disable rate limiting initially
NewDeleteScheduler();
int num_files = 10; // 10 files
uint64_t file_size = 1024; // every file is 1 kb
std::vector<int64_t> delete_kbs_per_sec = {512, 200, 0, 100, 50, -2, 25};
for (size_t t = 0; t < delete_kbs_per_sec.size(); t++) {
penalties.clear();
bg_delete_file = 0;
fg_delete_file = 0;
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearTrace();
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
DestroyAndCreateDir(dummy_files_dirs_[0]);
rate_bytes_per_sec_ = delete_kbs_per_sec[t] * 1024;
delete_scheduler_->SetRateBytesPerSecond(rate_bytes_per_sec_);
// Create 100 dummy files, every file is 1 Kb
std::vector<std::string> generated_files;
for (int i = 0; i < num_files; i++) {
std::string file_name = "file" + ToString(i) + ".data";
generated_files.push_back(NewDummyFile(file_name, file_size));
}
// Delete dummy files and measure time spent to empty trash
for (int i = 0; i < num_files; i++) {
ASSERT_OK(delete_scheduler_->DeleteFile(generated_files[i], ""));
}
ASSERT_EQ(CountNormalFiles(), 0);
if (rate_bytes_per_sec_ > 0) {
uint64_t delete_start_time = env_->NowMicros();
TEST_SYNC_POINT("DeleteSchedulerTest::DynamicRateLimiting1:1");
delete_scheduler_->WaitForEmptyTrash();
uint64_t time_spent_deleting = env_->NowMicros() - delete_start_time;
auto bg_errors = delete_scheduler_->GetBackgroundErrors();
ASSERT_EQ(bg_errors.size(), 0);
uint64_t total_files_size = 0;
uint64_t expected_penlty = 0;
ASSERT_EQ(penalties.size(), num_files);
for (int i = 0; i < num_files; i++) {
total_files_size += file_size;
expected_penlty = ((total_files_size * 1000000) / rate_bytes_per_sec_);
ASSERT_EQ(expected_penlty, penalties[i]);
}
ASSERT_GT(time_spent_deleting, expected_penlty * 0.9);
ASSERT_EQ(bg_delete_file, num_files);
ASSERT_EQ(fg_delete_file, 0);
} else {
ASSERT_EQ(penalties.size(), 0);
ASSERT_EQ(bg_delete_file, 0);
ASSERT_EQ(fg_delete_file, num_files);
}
ASSERT_EQ(CountTrashFiles(), 0);
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
}
}
TEST_F(DeleteSchedulerTest, ImmediateDeleteOn25PercDBSize) {
int bg_delete_file = 0;
int fg_delete_file = 0;
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
"DeleteScheduler::DeleteTrashFile:DeleteFile",
[&](void* /*arg*/) { bg_delete_file++; });
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
"DeleteScheduler::DeleteFile", [&](void* /*arg*/) { fg_delete_file++; });
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
int num_files = 100; // 100 files
uint64_t file_size = 1024 * 10; // 100 KB as a file size
rate_bytes_per_sec_ = 1; // 1 byte per sec (very slow trash delete)
NewDeleteScheduler();
delete_scheduler_->SetMaxTrashDBRatio(0.25);
std::vector<std::string> generated_files;
for (int i = 0; i < num_files; i++) {
std::string file_name = "file" + ToString(i) + ".data";
generated_files.push_back(NewDummyFile(file_name, file_size));
}
for (std::string& file_name : generated_files) {
delete_scheduler_->DeleteFile(file_name, "");
}
// When we end up with 26 files in trash we will start
// deleting new files immediately
ASSERT_EQ(fg_delete_file, 74);
ASSERT_EQ(26, stats_->getAndResetTickerCount(FILES_MARKED_TRASH));
ASSERT_EQ(74, stats_->getAndResetTickerCount(FILES_DELETED_IMMEDIATELY));
ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
}
TEST_F(DeleteSchedulerTest, IsTrashCheck) {
// Trash files
ASSERT_TRUE(DeleteScheduler::IsTrashFile("x.trash"));
ASSERT_TRUE(DeleteScheduler::IsTrashFile(".trash"));
ASSERT_TRUE(DeleteScheduler::IsTrashFile("abc.sst.trash"));
ASSERT_TRUE(DeleteScheduler::IsTrashFile("/a/b/c/abc..sst.trash"));
ASSERT_TRUE(DeleteScheduler::IsTrashFile("log.trash"));
ASSERT_TRUE(DeleteScheduler::IsTrashFile("^^^^^.log.trash"));
ASSERT_TRUE(DeleteScheduler::IsTrashFile("abc.t.trash"));
// Not trash files
ASSERT_FALSE(DeleteScheduler::IsTrashFile("abc.sst"));
ASSERT_FALSE(DeleteScheduler::IsTrashFile("abc.txt"));
ASSERT_FALSE(DeleteScheduler::IsTrashFile("/a/b/c/abc.sst"));
ASSERT_FALSE(DeleteScheduler::IsTrashFile("/a/b/c/abc.sstrash"));
ASSERT_FALSE(DeleteScheduler::IsTrashFile("^^^^^.trashh"));
ASSERT_FALSE(DeleteScheduler::IsTrashFile("abc.ttrash"));
ASSERT_FALSE(DeleteScheduler::IsTrashFile(".ttrash"));
ASSERT_FALSE(DeleteScheduler::IsTrashFile("abc.trashx"));
}
} // namespace ROCKSDB_NAMESPACE
int main(int argc, char** argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
#else
int main(int /*argc*/, char** /*argv*/) {
printf("DeleteScheduler is not supported in ROCKSDB_LITE\n");
return 0;
}
#endif // ROCKSDB_LITE
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