rocksdb/db/auto_roll_logger_test.cc
Andrew Kryczka 3943d16780 Fix race conditions in auto-rolling logger
Summary:
For GetLogFileSize() and Flush(), they previously did not follow the
synchronization pattern for accessing logger_. This meant ResetLogger() could
cause logger_ destruction while the unsynchronized functions were accessing it,
causing a segfault.

Also made the mutex instance variable mutable so we can preserve
GetLogFileSize()'s const-ness.

Test Plan:
new test case, it's quite ugly because both threads need to access
one of the functions with SyncPoints (PosixLogger::Flush()), and also special
handling is needed to prevent the mutex and sync points from conflicting.

Reviewers: kradhakrishnan, IslamAbdelRahman, sdong

Reviewed By: sdong

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D54237
2016-02-17 12:06:45 -08:00

471 lines
16 KiB
C++

// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
#include <string>
#include <thread>
#include <vector>
#include <cmath>
#include <iostream>
#include <fstream>
#include <iterator>
#include <algorithm>
#include "db/auto_roll_logger.h"
#include "util/sync_point.h"
#include "util/testharness.h"
#include "rocksdb/db.h"
#include <sys/stat.h>
#include <errno.h>
using namespace std;
namespace rocksdb {
class AutoRollLoggerTest : public testing::Test {
public:
static void InitTestDb() {
#ifdef OS_WIN
// Replace all slashes in the path so windows CompSpec does not
// become confused
std::string testDir(kTestDir);
std::replace_if(testDir.begin(), testDir.end(),
[](char ch) { return ch == '/'; }, '\\');
std::string deleteCmd = "if exist " + testDir + " rd /s /q " + testDir;
#else
std::string deleteCmd = "rm -rf " + kTestDir;
#endif
ASSERT_TRUE(system(deleteCmd.c_str()) == 0);
Env::Default()->CreateDir(kTestDir);
}
void RollLogFileBySizeTest(AutoRollLogger* logger,
size_t log_max_size,
const string& log_message);
uint64_t RollLogFileByTimeTest(AutoRollLogger* logger,
size_t time,
const string& log_message);
static const string kSampleMessage;
static const string kTestDir;
static const string kLogFile;
static Env* env;
};
const string AutoRollLoggerTest::kSampleMessage(
"this is the message to be written to the log file!!");
const string AutoRollLoggerTest::kTestDir(test::TmpDir() + "/db_log_test");
const string AutoRollLoggerTest::kLogFile(test::TmpDir() + "/db_log_test/LOG");
Env* AutoRollLoggerTest::env = Env::Default();
// In this test we only want to Log some simple log message with
// no format. LogMessage() provides such a simple interface and
// avoids the [format-security] warning which occurs when you
// call Log(logger, log_message) directly.
namespace {
void LogMessage(Logger* logger, const char* message) {
Log(logger, "%s", message);
}
void LogMessage(const InfoLogLevel log_level, Logger* logger,
const char* message) {
Log(log_level, logger, "%s", message);
}
} // namespace
namespace {
void GetFileCreateTime(const std::string& fname, uint64_t* file_ctime) {
struct stat s;
if (stat(fname.c_str(), &s) != 0) {
*file_ctime = (uint64_t)0;
}
*file_ctime = static_cast<uint64_t>(s.st_ctime);
}
} // namespace
void AutoRollLoggerTest::RollLogFileBySizeTest(AutoRollLogger* logger,
size_t log_max_size,
const string& log_message) {
logger->SetInfoLogLevel(InfoLogLevel::INFO_LEVEL);
// measure the size of each message, which is supposed
// to be equal or greater than log_message.size()
LogMessage(logger, log_message.c_str());
size_t message_size = logger->GetLogFileSize();
size_t current_log_size = message_size;
// Test the cases when the log file will not be rolled.
while (current_log_size + message_size < log_max_size) {
LogMessage(logger, log_message.c_str());
current_log_size += message_size;
ASSERT_EQ(current_log_size, logger->GetLogFileSize());
}
// Now the log file will be rolled
LogMessage(logger, log_message.c_str());
// Since rotation is checked before actual logging, we need to
// trigger the rotation by logging another message.
LogMessage(logger, log_message.c_str());
ASSERT_TRUE(message_size == logger->GetLogFileSize());
}
uint64_t AutoRollLoggerTest::RollLogFileByTimeTest(
AutoRollLogger* logger, size_t time, const string& log_message) {
uint64_t expected_create_time;
uint64_t actual_create_time;
uint64_t total_log_size;
EXPECT_OK(env->GetFileSize(kLogFile, &total_log_size));
GetFileCreateTime(kLogFile, &expected_create_time);
logger->SetCallNowMicrosEveryNRecords(0);
// -- Write to the log for several times, which is supposed
// to be finished before time.
for (int i = 0; i < 10; ++i) {
LogMessage(logger, log_message.c_str());
EXPECT_OK(logger->GetStatus());
// Make sure we always write to the same log file (by
// checking the create time);
GetFileCreateTime(kLogFile, &actual_create_time);
// Also make sure the log size is increasing.
EXPECT_EQ(expected_create_time, actual_create_time);
EXPECT_GT(logger->GetLogFileSize(), total_log_size);
total_log_size = logger->GetLogFileSize();
}
// -- Make the log file expire
#ifdef OS_WIN
Sleep(static_cast<unsigned int>(time) * 1000);
#else
sleep(static_cast<unsigned int>(time));
#endif
LogMessage(logger, log_message.c_str());
// At this time, the new log file should be created.
GetFileCreateTime(kLogFile, &actual_create_time);
EXPECT_GT(actual_create_time, expected_create_time);
EXPECT_LT(logger->GetLogFileSize(), total_log_size);
expected_create_time = actual_create_time;
return expected_create_time;
}
TEST_F(AutoRollLoggerTest, RollLogFileBySize) {
InitTestDb();
size_t log_max_size = 1024 * 5;
AutoRollLogger logger(Env::Default(), kTestDir, "", log_max_size, 0);
RollLogFileBySizeTest(&logger, log_max_size,
kSampleMessage + ":RollLogFileBySize");
}
TEST_F(AutoRollLoggerTest, RollLogFileByTime) {
size_t time = 2;
size_t log_size = 1024 * 5;
InitTestDb();
// -- Test the existence of file during the server restart.
ASSERT_EQ(Status::NotFound(), env->FileExists(kLogFile));
AutoRollLogger logger(Env::Default(), kTestDir, "", log_size, time);
ASSERT_OK(env->FileExists(kLogFile));
RollLogFileByTimeTest(&logger, time, kSampleMessage + ":RollLogFileByTime");
}
TEST_F(AutoRollLoggerTest, OpenLogFilesMultipleTimesWithOptionLog_max_size) {
// If only 'log_max_size' options is specified, then every time
// when rocksdb is restarted, a new empty log file will be created.
InitTestDb();
// WORKAROUND:
// avoid complier's complaint of "comparison between signed
// and unsigned integer expressions" because literal 0 is
// treated as "singed".
size_t kZero = 0;
size_t log_size = 1024;
AutoRollLogger* logger = new AutoRollLogger(
Env::Default(), kTestDir, "", log_size, 0);
LogMessage(logger, kSampleMessage.c_str());
ASSERT_GT(logger->GetLogFileSize(), kZero);
delete logger;
// reopens the log file and an empty log file will be created.
logger = new AutoRollLogger(
Env::Default(), kTestDir, "", log_size, 0);
ASSERT_EQ(logger->GetLogFileSize(), kZero);
delete logger;
}
TEST_F(AutoRollLoggerTest, CompositeRollByTimeAndSizeLogger) {
size_t time = 2, log_max_size = 1024 * 5;
InitTestDb();
AutoRollLogger logger(Env::Default(), kTestDir, "", log_max_size, time);
// Test the ability to roll by size
RollLogFileBySizeTest(
&logger, log_max_size,
kSampleMessage + ":CompositeRollByTimeAndSizeLogger");
// Test the ability to roll by Time
RollLogFileByTimeTest( &logger, time,
kSampleMessage + ":CompositeRollByTimeAndSizeLogger");
}
#ifndef OS_WIN
// TODO: does not build for Windows because of PosixLogger use below. Need to
// port
TEST_F(AutoRollLoggerTest, CreateLoggerFromOptions) {
DBOptions options;
shared_ptr<Logger> logger;
// Normal logger
ASSERT_OK(CreateLoggerFromOptions(kTestDir, options, &logger));
ASSERT_TRUE(dynamic_cast<PosixLogger*>(logger.get()));
// Only roll by size
InitTestDb();
options.max_log_file_size = 1024;
ASSERT_OK(CreateLoggerFromOptions(kTestDir, options, &logger));
AutoRollLogger* auto_roll_logger =
dynamic_cast<AutoRollLogger*>(logger.get());
ASSERT_TRUE(auto_roll_logger);
RollLogFileBySizeTest(
auto_roll_logger, options.max_log_file_size,
kSampleMessage + ":CreateLoggerFromOptions - size");
// Only roll by Time
InitTestDb();
options.max_log_file_size = 0;
options.log_file_time_to_roll = 2;
ASSERT_OK(CreateLoggerFromOptions(kTestDir, options, &logger));
auto_roll_logger =
dynamic_cast<AutoRollLogger*>(logger.get());
RollLogFileByTimeTest(
auto_roll_logger, options.log_file_time_to_roll,
kSampleMessage + ":CreateLoggerFromOptions - time");
// roll by both Time and size
InitTestDb();
options.max_log_file_size = 1024 * 5;
options.log_file_time_to_roll = 2;
ASSERT_OK(CreateLoggerFromOptions(kTestDir, options, &logger));
auto_roll_logger =
dynamic_cast<AutoRollLogger*>(logger.get());
RollLogFileBySizeTest(
auto_roll_logger, options.max_log_file_size,
kSampleMessage + ":CreateLoggerFromOptions - both");
RollLogFileByTimeTest(
auto_roll_logger, options.log_file_time_to_roll,
kSampleMessage + ":CreateLoggerFromOptions - both");
}
TEST_F(AutoRollLoggerTest, LogFlushWhileRolling) {
DBOptions options;
shared_ptr<Logger> logger;
InitTestDb();
options.max_log_file_size = 1024 * 5;
ASSERT_OK(CreateLoggerFromOptions(kTestDir, options, &logger));
AutoRollLogger* auto_roll_logger =
dynamic_cast<AutoRollLogger*>(logger.get());
ASSERT_TRUE(auto_roll_logger);
// The test is split into two parts, with the below callback happening between
// them:
// (1) Before ResetLogger() is reached, the log rolling test code occasionally
// invokes PosixLogger::Flush(). For this part, dependencies should not be
// enforced.
// (2) After ResetLogger() has begun, any calls to PosixLogger::Flush() will
// be from threads other than the log rolling thread. We want to only
// enforce dependencies for this part.
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"AutoRollLogger::Logv:BeforeResetLogger", [&](void* arg) {
rocksdb::SyncPoint::GetInstance()->LoadDependency({
{"PosixLogger::Flush:1",
"AutoRollLogger::ResetLogger:BeforeNewLogger"},
{"AutoRollLogger::ResetLogger:AfterNewLogger",
"PosixLogger::Flush:2"},
});
});
std::thread flush_thread;
// Additionally, to exercise the edge case, we need to ensure the old logger
// is used. For this, we pause after pinning the logger until dependencies
// have probably been loaded.
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"AutoRollLogger::Flush:PinnedLogger", [&](void* arg) {
if (std::this_thread::get_id() == flush_thread.get_id()) {
sleep(2);
}
});
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
flush_thread = std::thread([&]() { auto_roll_logger->Flush(); });
sleep(1);
RollLogFileBySizeTest(auto_roll_logger, options.max_log_file_size,
kSampleMessage + ":LogFlushWhileRolling");
flush_thread.join();
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
}
#endif // OS_WIN
TEST_F(AutoRollLoggerTest, InfoLogLevel) {
InitTestDb();
size_t log_size = 8192;
size_t log_lines = 0;
// an extra-scope to force the AutoRollLogger to flush the log file when it
// becomes out of scope.
{
AutoRollLogger logger(Env::Default(), kTestDir, "", log_size, 0);
for (int log_level = InfoLogLevel::HEADER_LEVEL;
log_level >= InfoLogLevel::DEBUG_LEVEL; log_level--) {
logger.SetInfoLogLevel((InfoLogLevel)log_level);
for (int log_type = InfoLogLevel::DEBUG_LEVEL;
log_type <= InfoLogLevel::HEADER_LEVEL; log_type++) {
// log messages with log level smaller than log_level will not be
// logged.
LogMessage((InfoLogLevel)log_type, &logger, kSampleMessage.c_str());
}
log_lines += InfoLogLevel::HEADER_LEVEL - log_level + 1;
}
for (int log_level = InfoLogLevel::HEADER_LEVEL;
log_level >= InfoLogLevel::DEBUG_LEVEL; log_level--) {
logger.SetInfoLogLevel((InfoLogLevel)log_level);
// again, messages with level smaller than log_level will not be logged.
Log(InfoLogLevel::HEADER_LEVEL, &logger, "%s", kSampleMessage.c_str());
Debug(&logger, "%s", kSampleMessage.c_str());
Info(&logger, "%s", kSampleMessage.c_str());
Warn(&logger, "%s", kSampleMessage.c_str());
Error(&logger, "%s", kSampleMessage.c_str());
Fatal(&logger, "%s", kSampleMessage.c_str());
log_lines += InfoLogLevel::HEADER_LEVEL - log_level + 1;
}
}
std::ifstream inFile(AutoRollLoggerTest::kLogFile.c_str());
size_t lines = std::count(std::istreambuf_iterator<char>(inFile),
std::istreambuf_iterator<char>(), '\n');
ASSERT_EQ(log_lines, lines);
inFile.close();
}
// Test the logger Header function for roll over logs
// We expect the new logs creates as roll over to carry the headers specified
static std::vector<string> GetOldFileNames(const string& path) {
std::vector<string> ret;
const string dirname = path.substr(/*start=*/ 0, path.find_last_of("/"));
const string fname = path.substr(path.find_last_of("/") + 1);
std::vector<string> children;
Env::Default()->GetChildren(dirname, &children);
// We know that the old log files are named [path]<something>
// Return all entities that match the pattern
for (auto& child : children) {
if (fname != child && child.find(fname) == 0) {
ret.push_back(dirname + "/" + child);
}
}
return ret;
}
// Return the number of lines where a given pattern was found in the file
static size_t GetLinesCount(const string& fname, const string& pattern) {
stringstream ssbuf;
string line;
size_t count = 0;
ifstream inFile(fname.c_str());
ssbuf << inFile.rdbuf();
while (getline(ssbuf, line)) {
if (line.find(pattern) != std::string::npos) {
count++;
}
}
return count;
}
TEST_F(AutoRollLoggerTest, LogHeaderTest) {
static const size_t MAX_HEADERS = 10;
static const size_t LOG_MAX_SIZE = 1024 * 5;
static const std::string HEADER_STR = "Log header line";
// test_num == 0 -> standard call to Header()
// test_num == 1 -> call to Log() with InfoLogLevel::HEADER_LEVEL
for (int test_num = 0; test_num < 2; test_num++) {
InitTestDb();
AutoRollLogger logger(Env::Default(), kTestDir, /*db_log_dir=*/ "",
LOG_MAX_SIZE, /*log_file_time_to_roll=*/ 0);
if (test_num == 0) {
// Log some headers explicitly using Header()
for (size_t i = 0; i < MAX_HEADERS; i++) {
Header(&logger, "%s %d", HEADER_STR.c_str(), i);
}
} else if (test_num == 1) {
// HEADER_LEVEL should make this behave like calling Header()
for (size_t i = 0; i < MAX_HEADERS; i++) {
Log(InfoLogLevel::HEADER_LEVEL, &logger, "%s %d",
HEADER_STR.c_str(), i);
}
}
const string newfname = logger.TEST_log_fname();
// Log enough data to cause a roll over
int i = 0;
for (size_t iter = 0; iter < 2; iter++) {
while (logger.GetLogFileSize() < LOG_MAX_SIZE) {
Info(&logger, (kSampleMessage + ":LogHeaderTest line %d").c_str(), i);
++i;
}
Info(&logger, "Rollover");
}
// Flush the log for the latest file
LogFlush(&logger);
const auto oldfiles = GetOldFileNames(newfname);
ASSERT_EQ(oldfiles.size(), (size_t) 2);
for (auto& oldfname : oldfiles) {
// verify that the files rolled over
ASSERT_NE(oldfname, newfname);
// verify that the old log contains all the header logs
ASSERT_EQ(GetLinesCount(oldfname, HEADER_STR), MAX_HEADERS);
}
}
}
TEST_F(AutoRollLoggerTest, LogFileExistence) {
rocksdb::DB* db;
rocksdb::Options options;
string deleteCmd = "rm -rf " + kTestDir;
ASSERT_EQ(system(deleteCmd.c_str()), 0);
options.max_log_file_size = 100 * 1024 * 1024;
options.create_if_missing = true;
ASSERT_OK(rocksdb::DB::Open(options, kTestDir, &db));
ASSERT_OK(env->FileExists(kLogFile));
delete db;
}
} // namespace rocksdb
int main(int argc, char** argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}