8272a6de57
Summary: The existing implementation does not guarantee bytes reach disk every `bytes_per_sync` when writing SST files, or every `wal_bytes_per_sync` when writing WALs. This can cause confusing behavior for users who enable this feature to avoid large syncs during flush and compaction, but then end up hitting them anyways. My understanding of the existing behavior is we used `sync_file_range` with `SYNC_FILE_RANGE_WRITE` to submit ranges for async writeback, such that we could continue processing the next range of bytes while that I/O is happening. I believe we can preserve that benefit while also limiting how far the processing can get ahead of the I/O, which prevents huge syncs from happening when the file finishes. Consider this `sync_file_range` usage: `sync_file_range(fd_, 0, static_cast<off_t>(offset + nbytes), SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE)`. Expanding the range to start at 0 and adding the `SYNC_FILE_RANGE_WAIT_BEFORE` flag causes any pending writeback (like from a previous call to `sync_file_range`) to finish before it proceeds to submit the latest `nbytes` for writeback. The latest `nbytes` are still written back asynchronously, unless processing exceeds I/O speed, in which case the following `sync_file_range` will need to wait on it. There is a second change in this PR to use `fdatasync` when `sync_file_range` is unavailable (determined statically) or has some known problem with the underlying filesystem (determined dynamically). The above two changes only apply when the user enables a new option, `strict_bytes_per_sync`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5183 Differential Revision: D14953553 Pulled By: siying fbshipit-source-id: 445c3862e019fb7b470f9c7f314fc231b62706e9
486 lines
21 KiB
C++
486 lines
21 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#ifndef __STDC_FORMAT_MACROS
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#define __STDC_FORMAT_MACROS
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#endif
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#include <cstring>
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#include "options/options_helper.h"
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#include "rocksdb/convenience.h"
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#include "util/testharness.h"
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#ifndef GFLAGS
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bool FLAGS_enable_print = false;
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#else
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#include "util/gflags_compat.h"
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using GFLAGS_NAMESPACE::ParseCommandLineFlags;
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DEFINE_bool(enable_print, false, "Print options generated to console.");
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#endif // GFLAGS
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namespace rocksdb {
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// Verify options are settable from options strings.
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// We take the approach that depends on compiler behavior that copy constructor
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// won't touch implicit padding bytes, so that the test is fragile.
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// As a result, we only run the tests to verify new fields in options are
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// settable through string on limited platforms as it depends on behavior of
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// compilers.
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#ifndef ROCKSDB_LITE
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#if defined OS_LINUX || defined OS_WIN
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#ifndef __clang__
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class OptionsSettableTest : public testing::Test {
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public:
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OptionsSettableTest() {}
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};
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const char kSpecialChar = 'z';
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typedef std::vector<std::pair<size_t, size_t>> OffsetGap;
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void FillWithSpecialChar(char* start_ptr, size_t total_size,
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const OffsetGap& blacklist) {
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size_t offset = 0;
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for (auto& pair : blacklist) {
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std::memset(start_ptr + offset, kSpecialChar, pair.first - offset);
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offset = pair.first + pair.second;
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}
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std::memset(start_ptr + offset, kSpecialChar, total_size - offset);
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}
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int NumUnsetBytes(char* start_ptr, size_t total_size,
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const OffsetGap& blacklist) {
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int total_unset_bytes_base = 0;
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size_t offset = 0;
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for (auto& pair : blacklist) {
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for (char* ptr = start_ptr + offset; ptr < start_ptr + pair.first; ptr++) {
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if (*ptr == kSpecialChar) {
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total_unset_bytes_base++;
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}
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}
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offset = pair.first + pair.second;
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}
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for (char* ptr = start_ptr + offset; ptr < start_ptr + total_size; ptr++) {
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if (*ptr == kSpecialChar) {
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total_unset_bytes_base++;
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}
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}
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return total_unset_bytes_base;
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}
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// If the test fails, likely a new option is added to BlockBasedTableOptions
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// but it cannot be set through GetBlockBasedTableOptionsFromString(), or the
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// test is not updated accordingly.
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// After adding an option, we need to make sure it is settable by
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// GetBlockBasedTableOptionsFromString() and add the option to the input string
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// passed to the GetBlockBasedTableOptionsFromString() in this test.
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// If it is a complicated type, you also need to add the field to
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// kBbtoBlacklist, and maybe add customized verification for it.
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TEST_F(OptionsSettableTest, BlockBasedTableOptionsAllFieldsSettable) {
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// Items in the form of <offset, size>. Need to be in ascending order
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// and not overlapping. Need to updated if new pointer-option is added.
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const OffsetGap kBbtoBlacklist = {
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{offsetof(struct BlockBasedTableOptions, flush_block_policy_factory),
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sizeof(std::shared_ptr<FlushBlockPolicyFactory>)},
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{offsetof(struct BlockBasedTableOptions, block_cache),
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sizeof(std::shared_ptr<Cache>)},
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{offsetof(struct BlockBasedTableOptions, persistent_cache),
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sizeof(std::shared_ptr<PersistentCache>)},
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{offsetof(struct BlockBasedTableOptions, block_cache_compressed),
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sizeof(std::shared_ptr<Cache>)},
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{offsetof(struct BlockBasedTableOptions, filter_policy),
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sizeof(std::shared_ptr<const FilterPolicy>)},
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};
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// In this test, we catch a new option of BlockBasedTableOptions that is not
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// settable through GetBlockBasedTableOptionsFromString().
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// We count padding bytes of the option struct, and assert it to be the same
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// as unset bytes of an option struct initialized by
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// GetBlockBasedTableOptionsFromString().
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char* bbto_ptr = new char[sizeof(BlockBasedTableOptions)];
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// Count padding bytes by setting all bytes in the memory to a special char,
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// copy a well constructed struct to this memory and see how many special
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// bytes left.
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BlockBasedTableOptions* bbto = new (bbto_ptr) BlockBasedTableOptions();
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FillWithSpecialChar(bbto_ptr, sizeof(BlockBasedTableOptions), kBbtoBlacklist);
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// It based on the behavior of compiler that padding bytes are not changed
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// when copying the struct. It's prone to failure when compiler behavior
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// changes. We verify there is unset bytes to detect the case.
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*bbto = BlockBasedTableOptions();
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int unset_bytes_base =
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NumUnsetBytes(bbto_ptr, sizeof(BlockBasedTableOptions), kBbtoBlacklist);
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ASSERT_GT(unset_bytes_base, 0);
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bbto->~BlockBasedTableOptions();
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// Construct the base option passed into
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// GetBlockBasedTableOptionsFromString().
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bbto = new (bbto_ptr) BlockBasedTableOptions();
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FillWithSpecialChar(bbto_ptr, sizeof(BlockBasedTableOptions), kBbtoBlacklist);
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// This option is not setable:
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bbto->use_delta_encoding = true;
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char* new_bbto_ptr = new char[sizeof(BlockBasedTableOptions)];
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BlockBasedTableOptions* new_bbto =
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new (new_bbto_ptr) BlockBasedTableOptions();
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FillWithSpecialChar(new_bbto_ptr, sizeof(BlockBasedTableOptions),
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kBbtoBlacklist);
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// Need to update the option string if a new option is added.
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ASSERT_OK(GetBlockBasedTableOptionsFromString(
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*bbto,
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"cache_index_and_filter_blocks=1;"
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"cache_index_and_filter_blocks_with_high_priority=true;"
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"pin_l0_filter_and_index_blocks_in_cache=1;"
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"pin_top_level_index_and_filter=1;"
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"index_type=kHashSearch;"
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"data_block_index_type=kDataBlockBinaryAndHash;"
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"index_shortening=kNoShortening;"
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"data_block_hash_table_util_ratio=0.75;"
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"checksum=kxxHash;hash_index_allow_collision=1;no_block_cache=1;"
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"block_cache=1M;block_cache_compressed=1k;block_size=1024;"
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"block_size_deviation=8;block_restart_interval=4; "
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"metadata_block_size=1024;"
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"partition_filters=false;"
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"index_block_restart_interval=4;"
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"filter_policy=bloomfilter:4:true;whole_key_filtering=1;"
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"format_version=1;"
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"hash_index_allow_collision=false;"
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"verify_compression=true;read_amp_bytes_per_bit=0;"
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"enable_index_compression=false;"
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"block_align=true",
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new_bbto));
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ASSERT_EQ(unset_bytes_base,
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NumUnsetBytes(new_bbto_ptr, sizeof(BlockBasedTableOptions),
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kBbtoBlacklist));
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ASSERT_TRUE(new_bbto->block_cache.get() != nullptr);
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ASSERT_TRUE(new_bbto->block_cache_compressed.get() != nullptr);
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ASSERT_TRUE(new_bbto->filter_policy.get() != nullptr);
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bbto->~BlockBasedTableOptions();
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new_bbto->~BlockBasedTableOptions();
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delete[] bbto_ptr;
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delete[] new_bbto_ptr;
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}
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// If the test fails, likely a new option is added to DBOptions
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// but it cannot be set through GetDBOptionsFromString(), or the test is not
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// updated accordingly.
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// After adding an option, we need to make sure it is settable by
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// GetDBOptionsFromString() and add the option to the input string passed to
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// DBOptionsFromString()in this test.
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// If it is a complicated type, you also need to add the field to
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// kDBOptionsBlacklist, and maybe add customized verification for it.
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TEST_F(OptionsSettableTest, DBOptionsAllFieldsSettable) {
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const OffsetGap kDBOptionsBlacklist = {
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{offsetof(struct DBOptions, env), sizeof(Env*)},
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{offsetof(struct DBOptions, rate_limiter),
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sizeof(std::shared_ptr<RateLimiter>)},
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{offsetof(struct DBOptions, sst_file_manager),
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sizeof(std::shared_ptr<SstFileManager>)},
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{offsetof(struct DBOptions, info_log), sizeof(std::shared_ptr<Logger>)},
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{offsetof(struct DBOptions, statistics),
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sizeof(std::shared_ptr<Statistics>)},
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{offsetof(struct DBOptions, db_paths), sizeof(std::vector<DbPath>)},
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{offsetof(struct DBOptions, db_log_dir), sizeof(std::string)},
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{offsetof(struct DBOptions, wal_dir), sizeof(std::string)},
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{offsetof(struct DBOptions, write_buffer_manager),
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sizeof(std::shared_ptr<WriteBufferManager>)},
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{offsetof(struct DBOptions, listeners),
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sizeof(std::vector<std::shared_ptr<EventListener>>)},
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{offsetof(struct DBOptions, row_cache), sizeof(std::shared_ptr<Cache>)},
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{offsetof(struct DBOptions, wal_filter), sizeof(const WalFilter*)},
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};
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char* options_ptr = new char[sizeof(DBOptions)];
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// Count padding bytes by setting all bytes in the memory to a special char,
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// copy a well constructed struct to this memory and see how many special
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// bytes left.
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DBOptions* options = new (options_ptr) DBOptions();
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FillWithSpecialChar(options_ptr, sizeof(DBOptions), kDBOptionsBlacklist);
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// It based on the behavior of compiler that padding bytes are not changed
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// when copying the struct. It's prone to failure when compiler behavior
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// changes. We verify there is unset bytes to detect the case.
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*options = DBOptions();
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int unset_bytes_base =
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NumUnsetBytes(options_ptr, sizeof(DBOptions), kDBOptionsBlacklist);
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ASSERT_GT(unset_bytes_base, 0);
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options->~DBOptions();
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options = new (options_ptr) DBOptions();
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FillWithSpecialChar(options_ptr, sizeof(DBOptions), kDBOptionsBlacklist);
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char* new_options_ptr = new char[sizeof(DBOptions)];
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DBOptions* new_options = new (new_options_ptr) DBOptions();
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FillWithSpecialChar(new_options_ptr, sizeof(DBOptions), kDBOptionsBlacklist);
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// Need to update the option string if a new option is added.
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ASSERT_OK(
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GetDBOptionsFromString(*options,
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"wal_bytes_per_sync=4295048118;"
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"delete_obsolete_files_period_micros=4294967758;"
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"WAL_ttl_seconds=4295008036;"
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"WAL_size_limit_MB=4295036161;"
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"wal_dir=path/to/wal_dir;"
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"db_write_buffer_size=2587;"
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"max_subcompactions=64330;"
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"table_cache_numshardbits=28;"
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"max_open_files=72;"
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"max_file_opening_threads=35;"
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"max_background_jobs=8;"
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"base_background_compactions=3;"
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"max_background_compactions=33;"
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"use_fsync=true;"
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"use_adaptive_mutex=false;"
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"max_total_wal_size=4295005604;"
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"compaction_readahead_size=0;"
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"new_table_reader_for_compaction_inputs=false;"
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"keep_log_file_num=4890;"
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"skip_stats_update_on_db_open=false;"
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"max_manifest_file_size=4295009941;"
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"db_log_dir=path/to/db_log_dir;"
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"skip_log_error_on_recovery=true;"
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"writable_file_max_buffer_size=1048576;"
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"paranoid_checks=true;"
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"is_fd_close_on_exec=false;"
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"bytes_per_sync=4295013613;"
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"strict_bytes_per_sync=true;"
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"enable_thread_tracking=false;"
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"recycle_log_file_num=0;"
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"create_missing_column_families=true;"
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"log_file_time_to_roll=3097;"
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"max_background_flushes=35;"
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"create_if_missing=false;"
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"error_if_exists=true;"
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"delayed_write_rate=4294976214;"
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"manifest_preallocation_size=1222;"
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"allow_mmap_writes=false;"
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"stats_dump_period_sec=70127;"
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"stats_persist_period_sec=54321;"
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"stats_history_buffer_size=14159;"
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"allow_fallocate=true;"
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"allow_mmap_reads=false;"
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"use_direct_reads=false;"
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"use_direct_io_for_flush_and_compaction=false;"
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"max_log_file_size=4607;"
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"random_access_max_buffer_size=1048576;"
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"advise_random_on_open=true;"
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"fail_if_options_file_error=false;"
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"enable_pipelined_write=false;"
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"allow_concurrent_memtable_write=true;"
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"wal_recovery_mode=kPointInTimeRecovery;"
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"enable_write_thread_adaptive_yield=true;"
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"write_thread_slow_yield_usec=5;"
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"write_thread_max_yield_usec=1000;"
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"access_hint_on_compaction_start=NONE;"
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"info_log_level=DEBUG_LEVEL;"
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"dump_malloc_stats=false;"
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"allow_2pc=false;"
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"avoid_flush_during_recovery=false;"
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"avoid_flush_during_shutdown=false;"
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"allow_ingest_behind=false;"
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"preserve_deletes=false;"
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"concurrent_prepare=false;"
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"two_write_queues=false;"
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"manual_wal_flush=false;"
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"seq_per_batch=false;"
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"atomic_flush=false;"
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"avoid_unnecessary_blocking_io=false",
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new_options));
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ASSERT_EQ(unset_bytes_base, NumUnsetBytes(new_options_ptr, sizeof(DBOptions),
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kDBOptionsBlacklist));
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options->~DBOptions();
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new_options->~DBOptions();
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delete[] options_ptr;
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delete[] new_options_ptr;
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}
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template <typename T1, typename T2>
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inline int offset_of(T1 T2::*member) {
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static T2 obj;
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return int(size_t(&(obj.*member)) - size_t(&obj));
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}
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// If the test fails, likely a new option is added to ColumnFamilyOptions
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// but it cannot be set through GetColumnFamilyOptionsFromString(), or the
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// test is not updated accordingly.
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// After adding an option, we need to make sure it is settable by
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// GetColumnFamilyOptionsFromString() and add the option to the input
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// string passed to GetColumnFamilyOptionsFromString()in this test.
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// If it is a complicated type, you also need to add the field to
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// kColumnFamilyOptionsBlacklist, and maybe add customized verification
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// for it.
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TEST_F(OptionsSettableTest, ColumnFamilyOptionsAllFieldsSettable) {
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// options in the blacklist need to appear in the same order as in
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// ColumnFamilyOptions.
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const OffsetGap kColumnFamilyOptionsBlacklist = {
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{offset_of(&ColumnFamilyOptions::inplace_callback),
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sizeof(UpdateStatus(*)(char*, uint32_t*, Slice, std::string*))},
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{offset_of(
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&ColumnFamilyOptions::memtable_insert_with_hint_prefix_extractor),
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sizeof(std::shared_ptr<const SliceTransform>)},
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{offset_of(&ColumnFamilyOptions::compression_per_level),
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sizeof(std::vector<CompressionType>)},
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{offset_of(
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&ColumnFamilyOptions::max_bytes_for_level_multiplier_additional),
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sizeof(std::vector<int>)},
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{offset_of(&ColumnFamilyOptions::memtable_factory),
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sizeof(std::shared_ptr<MemTableRepFactory>)},
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{offset_of(&ColumnFamilyOptions::table_properties_collector_factories),
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sizeof(ColumnFamilyOptions::TablePropertiesCollectorFactories)},
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{offset_of(&ColumnFamilyOptions::comparator), sizeof(Comparator*)},
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{offset_of(&ColumnFamilyOptions::merge_operator),
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sizeof(std::shared_ptr<MergeOperator>)},
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{offset_of(&ColumnFamilyOptions::compaction_filter),
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sizeof(const CompactionFilter*)},
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{offset_of(&ColumnFamilyOptions::compaction_filter_factory),
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sizeof(std::shared_ptr<CompactionFilterFactory>)},
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{offset_of(&ColumnFamilyOptions::prefix_extractor),
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sizeof(std::shared_ptr<const SliceTransform>)},
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{offset_of(&ColumnFamilyOptions::table_factory),
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sizeof(std::shared_ptr<TableFactory>)},
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{offset_of(&ColumnFamilyOptions::cf_paths),
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sizeof(std::vector<DbPath>)},
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{offset_of(&ColumnFamilyOptions::compaction_thread_limiter),
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sizeof(std::shared_ptr<ConcurrentTaskLimiter>)},
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};
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char* options_ptr = new char[sizeof(ColumnFamilyOptions)];
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// Count padding bytes by setting all bytes in the memory to a special char,
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// copy a well constructed struct to this memory and see how many special
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// bytes left.
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ColumnFamilyOptions* options = new (options_ptr) ColumnFamilyOptions();
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FillWithSpecialChar(options_ptr, sizeof(ColumnFamilyOptions),
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kColumnFamilyOptionsBlacklist);
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// It based on the behavior of compiler that padding bytes are not changed
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// when copying the struct. It's prone to failure when compiler behavior
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// changes. We verify there is unset bytes to detect the case.
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*options = ColumnFamilyOptions();
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// Deprecatd option which is not initialized. Need to set it to avoid
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// Valgrind error
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options->max_mem_compaction_level = 0;
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int unset_bytes_base = NumUnsetBytes(options_ptr, sizeof(ColumnFamilyOptions),
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kColumnFamilyOptionsBlacklist);
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ASSERT_GT(unset_bytes_base, 0);
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options->~ColumnFamilyOptions();
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options = new (options_ptr) ColumnFamilyOptions();
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FillWithSpecialChar(options_ptr, sizeof(ColumnFamilyOptions),
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kColumnFamilyOptionsBlacklist);
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// Following options are not settable through
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// GetColumnFamilyOptionsFromString():
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options->rate_limit_delay_max_milliseconds = 33;
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options->compaction_options_universal = CompactionOptionsUniversal();
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options->compression_opts = CompressionOptions();
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options->bottommost_compression_opts = CompressionOptions();
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options->hard_rate_limit = 0;
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options->soft_rate_limit = 0;
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options->purge_redundant_kvs_while_flush = false;
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options->max_mem_compaction_level = 0;
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options->compaction_filter = nullptr;
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char* new_options_ptr = new char[sizeof(ColumnFamilyOptions)];
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ColumnFamilyOptions* new_options =
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new (new_options_ptr) ColumnFamilyOptions();
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FillWithSpecialChar(new_options_ptr, sizeof(ColumnFamilyOptions),
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kColumnFamilyOptionsBlacklist);
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// Need to update the option string if a new option is added.
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ASSERT_OK(GetColumnFamilyOptionsFromString(
|
|
*options,
|
|
"compaction_filter_factory=mpudlojcujCompactionFilterFactory;"
|
|
"table_factory=PlainTable;"
|
|
"prefix_extractor=rocksdb.CappedPrefix.13;"
|
|
"comparator=leveldb.BytewiseComparator;"
|
|
"compression_per_level=kBZip2Compression:kBZip2Compression:"
|
|
"kBZip2Compression:kNoCompression:kZlibCompression:kBZip2Compression:"
|
|
"kSnappyCompression;"
|
|
"max_bytes_for_level_base=986;"
|
|
"bloom_locality=8016;"
|
|
"target_file_size_base=4294976376;"
|
|
"memtable_huge_page_size=2557;"
|
|
"max_successive_merges=5497;"
|
|
"max_sequential_skip_in_iterations=4294971408;"
|
|
"arena_block_size=1893;"
|
|
"target_file_size_multiplier=35;"
|
|
"min_write_buffer_number_to_merge=9;"
|
|
"max_write_buffer_number=84;"
|
|
"write_buffer_size=1653;"
|
|
"max_compaction_bytes=64;"
|
|
"max_bytes_for_level_multiplier=60;"
|
|
"memtable_factory=SkipListFactory;"
|
|
"compression=kNoCompression;"
|
|
"bottommost_compression=kDisableCompressionOption;"
|
|
"level0_stop_writes_trigger=33;"
|
|
"num_levels=99;"
|
|
"level0_slowdown_writes_trigger=22;"
|
|
"level0_file_num_compaction_trigger=14;"
|
|
"compaction_filter=urxcqstuwnCompactionFilter;"
|
|
"soft_rate_limit=530.615385;"
|
|
"soft_pending_compaction_bytes_limit=0;"
|
|
"max_write_buffer_number_to_maintain=84;"
|
|
"merge_operator=aabcxehazrMergeOperator;"
|
|
"memtable_prefix_bloom_size_ratio=0.4642;"
|
|
"memtable_whole_key_filtering=true;"
|
|
"memtable_insert_with_hint_prefix_extractor=rocksdb.CappedPrefix.13;"
|
|
"paranoid_file_checks=true;"
|
|
"force_consistency_checks=true;"
|
|
"inplace_update_num_locks=7429;"
|
|
"optimize_filters_for_hits=false;"
|
|
"level_compaction_dynamic_level_bytes=false;"
|
|
"inplace_update_support=false;"
|
|
"compaction_style=kCompactionStyleFIFO;"
|
|
"compaction_pri=kMinOverlappingRatio;"
|
|
"hard_pending_compaction_bytes_limit=0;"
|
|
"disable_auto_compactions=false;"
|
|
"report_bg_io_stats=true;"
|
|
"ttl=60;"
|
|
"periodic_compaction_seconds=3600;"
|
|
"sample_for_compression=0;"
|
|
"compaction_options_fifo={max_table_files_size=3;allow_"
|
|
"compaction=false;};",
|
|
new_options));
|
|
|
|
ASSERT_EQ(unset_bytes_base,
|
|
NumUnsetBytes(new_options_ptr, sizeof(ColumnFamilyOptions),
|
|
kColumnFamilyOptionsBlacklist));
|
|
|
|
options->~ColumnFamilyOptions();
|
|
new_options->~ColumnFamilyOptions();
|
|
|
|
delete[] options_ptr;
|
|
delete[] new_options_ptr;
|
|
}
|
|
#endif // !__clang__
|
|
#endif // OS_LINUX || OS_WIN
|
|
#endif // !ROCKSDB_LITE
|
|
|
|
} // namespace rocksdb
|
|
|
|
int main(int argc, char** argv) {
|
|
::testing::InitGoogleTest(&argc, argv);
|
|
#ifdef GFLAGS
|
|
ParseCommandLineFlags(&argc, &argv, true);
|
|
#endif // GFLAGS
|
|
return RUN_ALL_TESTS();
|
|
}
|