Revision 0d4a2b733070a1bd52f981313f9e17f126701407 authored by Yi Wu on 04 August 2017, 20:09:56 UTC, committed by Facebook Github Bot on 04 August 2017, 20:12:07 UTC
Summary: The FsyncFiles background job call Fsync() periodically for blob files. However it can access WritableFileWriter concurrently with a Put() or Write(). And WritableFileWriter does not support concurrent access. It will lead to WritableFileWriter buffer being flush with same content twice, and blob file end up corrupted. Fixing by simply let FsyncFiles hold write_mutex_. Closes https://github.com/facebook/rocksdb/pull/2685 Differential Revision: D5561908 Pulled By: yiwu-arbug fbshipit-source-id: f0bb5bcab0e05694e053b8c49eab43640721e872
1 parent 627c9f1
rate_limiter_test.cc
// 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).
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#ifndef __STDC_FORMAT_MACROS
#define __STDC_FORMAT_MACROS
#endif
#include "util/rate_limiter.h"
#include <inttypes.h>
#include <limits>
#include "rocksdb/env.h"
#include "util/random.h"
#include "util/sync_point.h"
#include "util/testharness.h"
namespace rocksdb {
// TODO(yhchiang): the rate will not be accurate when we run test in parallel.
class RateLimiterTest : public testing::Test {};
TEST_F(RateLimiterTest, OverflowRate) {
GenericRateLimiter limiter(port::kMaxInt64, 1000, 10);
ASSERT_GT(limiter.GetSingleBurstBytes(), 1000000000ll);
}
TEST_F(RateLimiterTest, StartStop) {
std::unique_ptr<RateLimiter> limiter(NewGenericRateLimiter(100, 100, 10));
}
TEST_F(RateLimiterTest, Modes) {
for (auto mode : {RateLimiter::Mode::kWritesOnly,
RateLimiter::Mode::kReadsOnly, RateLimiter::Mode::kAllIo}) {
GenericRateLimiter limiter(2000 /* rate_bytes_per_sec */,
1000 * 1000 /* refill_period_us */,
10 /* fairness */, mode);
limiter.Request(1000 /* bytes */, Env::IO_HIGH, nullptr /* stats */,
RateLimiter::OpType::kRead);
if (mode == RateLimiter::Mode::kWritesOnly) {
ASSERT_EQ(0, limiter.GetTotalBytesThrough(Env::IO_HIGH));
} else {
ASSERT_EQ(1000, limiter.GetTotalBytesThrough(Env::IO_HIGH));
}
limiter.Request(1000 /* bytes */, Env::IO_HIGH, nullptr /* stats */,
RateLimiter::OpType::kWrite);
if (mode == RateLimiter::Mode::kAllIo) {
ASSERT_EQ(2000, limiter.GetTotalBytesThrough(Env::IO_HIGH));
} else {
ASSERT_EQ(1000, limiter.GetTotalBytesThrough(Env::IO_HIGH));
}
}
}
#if !(defined(TRAVIS) && defined(OS_MACOSX))
TEST_F(RateLimiterTest, Rate) {
auto* env = Env::Default();
struct Arg {
Arg(int32_t _target_rate, int _burst)
: limiter(NewGenericRateLimiter(_target_rate, 100 * 1000, 10)),
request_size(_target_rate / 10),
burst(_burst) {}
std::unique_ptr<RateLimiter> limiter;
int32_t request_size;
int burst;
};
auto writer = [](void* p) {
auto* thread_env = Env::Default();
auto* arg = static_cast<Arg*>(p);
// Test for 2 seconds
auto until = thread_env->NowMicros() + 2 * 1000000;
Random r((uint32_t)(thread_env->NowNanos() %
std::numeric_limits<uint32_t>::max()));
while (thread_env->NowMicros() < until) {
for (int i = 0; i < static_cast<int>(r.Skewed(arg->burst) + 1); ++i) {
arg->limiter->Request(r.Uniform(arg->request_size - 1) + 1,
Env::IO_HIGH, nullptr /* stats */,
RateLimiter::OpType::kWrite);
}
arg->limiter->Request(r.Uniform(arg->request_size - 1) + 1, Env::IO_LOW,
nullptr /* stats */, RateLimiter::OpType::kWrite);
}
};
for (int i = 1; i <= 16; i *= 2) {
int32_t target = i * 1024 * 10;
Arg arg(target, i / 4 + 1);
int64_t old_total_bytes_through = 0;
for (int iter = 1; iter <= 2; ++iter) {
// second iteration changes the target dynamically
if (iter == 2) {
target *= 2;
arg.limiter->SetBytesPerSecond(target);
}
auto start = env->NowMicros();
for (int t = 0; t < i; ++t) {
env->StartThread(writer, &arg);
}
env->WaitForJoin();
auto elapsed = env->NowMicros() - start;
double rate =
(arg.limiter->GetTotalBytesThrough() - old_total_bytes_through) *
1000000.0 / elapsed;
old_total_bytes_through = arg.limiter->GetTotalBytesThrough();
fprintf(stderr,
"request size [1 - %" PRIi32 "], limit %" PRIi32
" KB/sec, actual rate: %lf KB/sec, elapsed %.2lf seconds\n",
arg.request_size - 1, target / 1024, rate / 1024,
elapsed / 1000000.0);
ASSERT_GE(rate / target, 0.80);
ASSERT_LE(rate / target, 1.25);
}
}
}
#endif
TEST_F(RateLimiterTest, LimitChangeTest) {
// starvation test when limit changes to a smaller value
int64_t refill_period = 1000 * 1000;
auto* env = Env::Default();
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
struct Arg {
Arg(int32_t _request_size, Env::IOPriority _pri,
std::shared_ptr<RateLimiter> _limiter)
: request_size(_request_size), pri(_pri), limiter(_limiter) {}
int32_t request_size;
Env::IOPriority pri;
std::shared_ptr<RateLimiter> limiter;
};
auto writer = [](void* p) {
auto* arg = static_cast<Arg*>(p);
arg->limiter->Request(arg->request_size, arg->pri, nullptr /* stats */,
RateLimiter::OpType::kWrite);
};
for (uint32_t i = 1; i <= 16; i <<= 1) {
int32_t target = i * 1024 * 10;
// refill per second
for (int iter = 0; iter < 2; iter++) {
std::shared_ptr<RateLimiter> limiter =
std::make_shared<GenericRateLimiter>(target, refill_period, 10);
rocksdb::SyncPoint::GetInstance()->LoadDependency(
{{"GenericRateLimiter::Request",
"RateLimiterTest::LimitChangeTest:changeLimitStart"},
{"RateLimiterTest::LimitChangeTest:changeLimitEnd",
"GenericRateLimiter::Refill"}});
Arg arg(target, Env::IO_HIGH, limiter);
// The idea behind is to start a request first, then before it refills,
// update limit to a different value (2X/0.5X). No starvation should
// be guaranteed under any situation
// TODO(lightmark): more test cases are welcome.
env->StartThread(writer, &arg);
int32_t new_limit = (target << 1) >> (iter << 1);
TEST_SYNC_POINT("RateLimiterTest::LimitChangeTest:changeLimitStart");
arg.limiter->SetBytesPerSecond(new_limit);
TEST_SYNC_POINT("RateLimiterTest::LimitChangeTest:changeLimitEnd");
env->WaitForJoin();
fprintf(stderr,
"[COMPLETE] request size %" PRIi32 " KB, new limit %" PRIi32
"KB/sec, refill period %" PRIi64 " ms\n",
target / 1024, new_limit / 1024, refill_period / 1000);
}
}
}
} // namespace rocksdb
int main(int argc, char** argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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