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Kill flashcache code in RocksDB 

Summary:
Now that we have userspace persisted cache, we don't need flashcache anymore.
Closes https://github.com/facebook/rocksdb/pull/1588

Differential Revision: D4245114

Pulled By: igorcanadi

fbshipit-source-id: e2c1c72
This commit is contained in:
Igor Canadi 2016-12-01 10:00:56 -08:00 committed by Facebook Github Bot
parent b77007df8b
commit 3f407b065c
8 changed files with 4 additions and 271 deletions
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1
CMakeLists.txt
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@ -400,7 +400,6 @@ set(SOURCES
utilities/document/json_document_builder.cc
utilities/env_mirror.cc
utilities/env_registry.cc
utilities/flashcache/flashcache.cc
utilities/geodb/geodb_impl.cc
utilities/leveldb_options/leveldb_options.cc
utilities/lua/rocks_lua_compaction_filter.cc

1
HISTORY.md
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@ -3,6 +3,7 @@
### Public API Change
* Options.level0_stop_writes_trigger default value changes from 24 to 32.
* New compaction filter API: CompactionFilter::FilterV2(). Allows to drop ranges of keys.
* Removed flashcache support.
## 5.0.0 (11/17/2016)
### Public API Change

25
include/rocksdb/utilities/flashcache.h
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@ -1,25 +0,0 @@
// 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.
#pragma once
#include <string>
#include "rocksdb/env.h"
namespace rocksdb {
// This API is experimental. We will mark it stable once we run it in production
// for a while.
// NewFlashcacheAwareEnv() creates and Env that blacklists all background
// threads (used for flush and compaction) from using flashcache to cache their
// reads. Reads from compaction thread don't need to be cached because they are
// going to be soon made obsolete (due to nature of compaction)
// Usually you would pass Env::Default() as base.
// cachedev_fd is a file descriptor of the flashcache device. Caller has to
// open flashcache device before calling this API.
extern std::unique_ptr<Env> NewFlashcacheAwareEnv(
Env* base, const int cachedev_fd);
} // namespace rocksdb

1
src.mk
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@ -154,7 +154,6 @@ LIB_SOURCES = \
utilities/document/json_document.cc \
utilities/env_mirror.cc \
utilities/env_registry.cc \
utilities/flashcache/flashcache.cc \
utilities/geodb/geodb_impl.cc \
utilities/leveldb_options/leveldb_options.cc \
utilities/lua/rocks_lua_compaction_filter.cc \

55
third-party/flashcache/flashcache_ioctl.h vendored
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@ -1,55 +0,0 @@
/****************************************************************************
* flashcache_ioctl.h
* FlashCache: Device mapper target for block-level disk caching
*
* Copyright 2010 Facebook, Inc.
* Author: Mohan Srinivasan (mohan@facebook.com)
*
* Based on DM-Cache:
* Copyright (C) International Business Machines Corp., 2006
* Author: Ming Zhao (mingzhao@ufl.edu)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; under version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
****************************************************************************/
#ifdef OS_LINUX
#ifndef FLASHCACHE_IOCTL_H
#define FLASHCACHE_IOCTL_H
#include <linux/types.h>
#define FLASHCACHE_IOCTL 0xfe
enum {
FLASHCACHEADDNCPID_CMD=200,
FLASHCACHEDELNCPID_CMD,
FLASHCACHEDELNCALL_CMD,
FLASHCACHEADDWHITELIST_CMD,
FLASHCACHEDELWHITELIST_CMD,
FLASHCACHEDELWHITELISTALL_CMD,
};
#define FLASHCACHEADDNCPID _IOW(FLASHCACHE_IOCTL, FLASHCACHEADDNCPID_CMD, pid_t)
#define FLASHCACHEDELNCPID _IOW(FLASHCACHE_IOCTL, FLASHCACHEDELNCPID_CMD, pid_t)
#define FLASHCACHEDELNCALL _IOW(FLASHCACHE_IOCTL, FLASHCACHEDELNCALL_CMD, pid_t)
#define FLASHCACHEADDBLACKLIST FLASHCACHEADDNCPID
#define FLASHCACHEDELBLACKLIST FLASHCACHEDELNCPID
#define FLASHCACHEDELALLBLACKLIST FLASHCACHEDELNCALL
#define FLASHCACHEADDWHITELIST _IOW(FLASHCACHE_IOCTL, FLASHCACHEADDWHITELIST_CMD, pid_t)
#define FLASHCACHEDELWHITELIST _IOW(FLASHCACHE_IOCTL, FLASHCACHEDELWHITELIST_CMD, pid_t)
#define FLASHCACHEDELALLWHITELIST _IOW(FLASHCACHE_IOCTL, FLASHCACHEDELWHITELISTALL_CMD, pid_t)
#endif /* FLASHCACHE_IOCTL_H */
#endif /* OS_LINUX */

34
tools/db_bench_tool.cc
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@ -48,7 +48,6 @@
#include "rocksdb/slice.h"
#include "rocksdb/slice_transform.h"
#include "rocksdb/utilities/env_registry.h"
#include "rocksdb/utilities/flashcache.h"
#include "rocksdb/utilities/optimistic_transaction_db.h"
#include "rocksdb/utilities/options_util.h"
#include "rocksdb/utilities/sim_cache.h"
@ -583,8 +582,6 @@ DEFINE_string(
"\t--row_cache_size\n"
"\t--row_cache_numshardbits\n"
"\t--enable_io_prio\n"
"\t--disable_flashcache_for_background_threads\n"
"\t--flashcache_dev\n"
"\t--dump_malloc_stats\n"
"\t--num_multi_db\n");
#endif // ROCKSDB_LITE
@ -782,11 +779,6 @@ DEFINE_string(compaction_fadvice, "NORMAL",
static auto FLAGS_compaction_fadvice_e =
rocksdb::Options().access_hint_on_compaction_start;
DEFINE_bool(disable_flashcache_for_background_threads, false,
"Disable flashcache for background threads");
DEFINE_string(flashcache_dev, "", "Path to flashcache device");
DEFINE_bool(use_tailing_iterator, false,
"Use tailing iterator to access a series of keys instead of get");
@ -1755,7 +1747,6 @@ class Benchmark {
int64_t readwrites_;
int64_t merge_keys_;
bool report_file_operations_;
int cachedev_fd_;
bool SanityCheck() {
if (FLAGS_compression_ratio > 1) {
@ -2011,8 +2002,7 @@ class Benchmark {
? FLAGS_num
: ((FLAGS_writes > FLAGS_reads) ? FLAGS_writes : FLAGS_reads)),
merge_keys_(FLAGS_merge_keys < 0 ? FLAGS_num : FLAGS_merge_keys),
report_file_operations_(FLAGS_report_file_operations),
cachedev_fd_(-1) {
report_file_operations_(FLAGS_report_file_operations) {
// use simcache instead of cache
if (FLAGS_simcache_size >= 0) {
if (FLAGS_cache_numshardbits >= 1) {
@ -2071,11 +2061,6 @@ class Benchmark {
// this will leak, but we're shutting down so nobody cares
cache_->DisownData();
}
if (FLAGS_disable_flashcache_for_background_threads && cachedev_fd_ != -1) {
// Dtor for thiis env should run before cachedev_fd_ is closed
flashcache_aware_env_ = nullptr;
close(cachedev_fd_);
}
}
Slice AllocateKey(std::unique_ptr<const char[]>* key_guard) {
@ -2434,7 +2419,6 @@ class Benchmark {
}
private:
std::unique_ptr<Env> flashcache_aware_env_;
std::shared_ptr<TimestampEmulator> timestamp_emulator_;
struct ThreadArg {
@ -3017,23 +3001,7 @@ class Benchmark {
FLAGS_env->LowerThreadPoolIOPriority(Env::LOW);
FLAGS_env->LowerThreadPoolIOPriority(Env::HIGH);
}
if (FLAGS_disable_flashcache_for_background_threads && cachedev_fd_ == -1) {
// Avoid creating the env twice when an use_existing_db is true
cachedev_fd_ = open(FLAGS_flashcache_dev.c_str(), O_RDONLY);
if (cachedev_fd_ < 0) {
fprintf(stderr, "Open flash device failed\n");
exit(1);
}
flashcache_aware_env_ = NewFlashcacheAwareEnv(FLAGS_env, cachedev_fd_);
if (flashcache_aware_env_.get() == nullptr) {
fprintf(stderr, "Failed to open flashcache device at %s\n",
FLAGS_flashcache_dev.c_str());
std::abort();
}
options.env = flashcache_aware_env_.get();
} else {
options.env = FLAGS_env;
}
if (FLAGS_num_multi_db <= 1) {
OpenDb(options, FLAGS_db, &db_);

136
utilities/flashcache/flashcache.cc
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@ -1,136 +0,0 @@
// 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 "utilities/flashcache/flashcache.h"
#include "rocksdb/utilities/flashcache.h"
#ifdef OS_LINUX
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <unistd.h>
#include "third-party/flashcache/flashcache_ioctl.h"
#endif
namespace rocksdb {
#if !defined(ROCKSDB_LITE) && defined(OS_LINUX)
// Most of the code that handles flashcache is copied from websql's branch of
// mysql-5.6
class FlashcacheAwareEnv : public EnvWrapper {
public:
FlashcacheAwareEnv(Env* base, int cachedev_fd)
: EnvWrapper(base), cachedev_fd_(cachedev_fd) {
pid_t pid = getpid();
/* cleanup previous whitelistings */
if (ioctl(cachedev_fd_, FLASHCACHEDELALLWHITELIST, &pid) < 0) {
cachedev_fd_ = -1;
fprintf(stderr, "ioctl del-all-whitelist for flashcache failed\n");
return;
}
if (ioctl(cachedev_fd_, FLASHCACHEADDWHITELIST, &pid) < 0) {
fprintf(stderr, "ioctl add-whitelist for flashcache failed\n");
}
}
~FlashcacheAwareEnv() {
// cachedev_fd_ is -1 if it's unitialized
if (cachedev_fd_ != -1) {
pid_t pid = getpid();
if (ioctl(cachedev_fd_, FLASHCACHEDELWHITELIST, &pid) < 0) {
fprintf(stderr, "ioctl del-whitelist for flashcache failed\n");
}
}
}
static int BlacklistCurrentThread(int cachedev_fd) {
pid_t pid = static_cast<pid_t>(syscall(SYS_gettid));
return ioctl(cachedev_fd, FLASHCACHEADDNCPID, &pid);
}
static int WhitelistCurrentThread(int cachedev_fd) {
pid_t pid = static_cast<pid_t>(syscall(SYS_gettid));
return ioctl(cachedev_fd, FLASHCACHEDELNCPID, &pid);
}
int GetFlashCacheFileDescriptor() { return cachedev_fd_; }
struct Arg {
Arg(void (*f)(void* arg), void* a, int _cachedev_fd)
: original_function_(f), original_arg_(a), cachedev_fd(_cachedev_fd) {}
void (*original_function_)(void* arg);
void* original_arg_;
int cachedev_fd;
};
static void BgThreadWrapper(void* a) {
Arg* arg = reinterpret_cast<Arg*>(a);
if (arg->cachedev_fd != -1) {
if (BlacklistCurrentThread(arg->cachedev_fd) < 0) {
fprintf(stderr, "ioctl add-nc-pid for flashcache failed\n");
}
}
arg->original_function_(arg->original_arg_);
if (arg->cachedev_fd != -1) {
if (WhitelistCurrentThread(arg->cachedev_fd) < 0) {
fprintf(stderr, "ioctl del-nc-pid for flashcache failed\n");
}
}
delete arg;
}
int UnSchedule(void* arg, Priority pri) override {
// no unschedule for you
return 0;
}
void Schedule(void (*f)(void* arg), void* a, Priority pri,
void* tag = nullptr, void (*u)(void* arg) = 0) override {
EnvWrapper::Schedule(&BgThreadWrapper, new Arg(f, a, cachedev_fd_), pri,
tag);
}
private:
int cachedev_fd_;
};
std::unique_ptr<Env> NewFlashcacheAwareEnv(Env* base,
const int cachedev_fd) {
std::unique_ptr<Env> ret(new FlashcacheAwareEnv(base, cachedev_fd));
return ret;
}
int FlashcacheBlacklistCurrentThread(Env* flashcache_aware_env) {
int fd = dynamic_cast<FlashcacheAwareEnv*>(flashcache_aware_env)
->GetFlashCacheFileDescriptor();
if (fd == -1) {
return -1;
}
return FlashcacheAwareEnv::BlacklistCurrentThread(fd);
}
int FlashcacheWhitelistCurrentThread(Env* flashcache_aware_env) {
int fd = dynamic_cast<FlashcacheAwareEnv*>(flashcache_aware_env)
->GetFlashCacheFileDescriptor();
if (fd == -1) {
return -1;
}
return FlashcacheAwareEnv::WhitelistCurrentThread(fd);
}
#else // !defined(ROCKSDB_LITE) && defined(OS_LINUX)
std::unique_ptr<Env> NewFlashcacheAwareEnv(Env* base,
const int cachedev_fd) {
return nullptr;
}
int FlashcacheBlacklistCurrentThread(Env* flashcache_aware_env) { return -1; }
int FlashcacheWhitelistCurrentThread(Env* flashcache_aware_env) { return -1; }
#endif // !defined(ROCKSDB_LITE) && defined(OS_LINUX)
} // namespace rocksdb

18
utilities/flashcache/flashcache.h
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@ -1,18 +0,0 @@
// 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.
#pragma once
#include <string>
#include "rocksdb/env.h"
namespace rocksdb {
// This is internal API that will make hacking on flashcache easier. Not sure if
// we need to expose this to public users, probably not
extern int FlashcacheBlacklistCurrentThread(Env* flashcache_aware_env);
extern int FlashcacheWhitelistCurrentThread(Env* flashcache_aware_env);
} // namespace rocksdb