Addressing TODOs in CuckooTableBuilder
Summary: Contains the following changes in CuckooTableBuilder: - Take an extra parameter in constructor to identify last level file. - Implement a better way to identify if a bucket has been inserted into the tree already during BFS search. - Minor typos Test Plan: make cuckoo_table_builder ./cuckoo_table_builder make valgrind_check Reviewers: sdong, igor, yhchiang, ljin Reviewed By: ljin Subscribers: leveldb Differential Revision: https://reviews.facebook.net/D20445
This commit is contained in:
Radheshyam Balasundaram
parent
4b61a3d67d
commit
07a7d870b8
@ -185,7 +185,8 @@ extern TableFactory* NewPlainTableFactory(const PlainTableOptions& options =
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PlainTableOptions());
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struct CuckooTablePropertyNames {
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static const std::string kEmptyBucket;
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static const std::string kEmptyKey;
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static const std::string kValueLength;
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static const std::string kNumHashTable;
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static const std::string kMaxNumBuckets;
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};
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@ -1,4 +1,4 @@
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// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// Copyright (c) 2014, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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@ -21,37 +21,38 @@
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#include "util/random.h"
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namespace rocksdb {
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const std::string CuckooTablePropertyNames::kEmptyBucket =
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"rocksdb.cuckoo.bucket.empty.bucket";
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const std::string CuckooTablePropertyNames::kEmptyKey =
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"rocksdb.cuckoo.bucket.empty.key";
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const std::string CuckooTablePropertyNames::kNumHashTable =
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"rocksdb.cuckoo.hash.num";
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const std::string CuckooTablePropertyNames::kMaxNumBuckets =
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"rocksdb.cuckoo.bucket.maxnum";
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const std::string CuckooTablePropertyNames::kValueLength =
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"rocksdb.cuckoo.value.length";
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// Obtained by running echo rocksdb.table.cuckoo | sha1sum
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extern const uint64_t kCuckooTableMagicNumber = 0x926789d0c5f17873ull;
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CuckooTableBuilder::CuckooTableBuilder(
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WritableFile* file, unsigned int fixed_key_length,
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unsigned int fixed_value_length, double hash_table_ratio,
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unsigned int file_size, unsigned int max_num_hash_table,
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unsigned int max_search_depth,
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unsigned int (*GetSliceHashPtr)(const Slice&, unsigned int,
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unsigned int))
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: num_hash_table_(std::min((unsigned int) 4, max_num_hash_table)),
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WritableFile* file, uint32_t fixed_key_length,
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uint32_t fixed_value_length, double hash_table_ratio,
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uint64_t file_size, uint32_t max_num_hash_table,
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uint32_t max_search_depth, bool is_last_level,
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uint64_t (*GetSliceHashPtr)(const Slice&, uint32_t, uint64_t))
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: num_hash_table_(2),
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file_(file),
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value_length_(fixed_value_length),
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bucket_size_(fixed_key_length + fixed_value_length),
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// 8 is the difference between sizes of user key and InternalKey.
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bucket_size_(fixed_key_length +
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fixed_value_length - (is_last_level ? 8 : 0)),
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hash_table_ratio_(hash_table_ratio),
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max_num_buckets_(file_size / bucket_size_),
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max_num_hash_table_(max_num_hash_table),
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max_search_depth_(max_search_depth),
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is_last_level_file_(is_last_level),
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buckets_(max_num_buckets_),
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make_space_for_key_call_id_(0),
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GetSliceHash(GetSliceHashPtr) {
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// The bucket_size is currently not optimized for last level.
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// In last level, the bucket will not contain full key.
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// TODO(rbs): Find how we can determine if last level or not
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// before we start adding entries into the table.
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properties_.num_entries = 0;
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// Data is in a huge block.
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properties_.num_data_blocks = 1;
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@ -67,17 +68,17 @@ void CuckooTableBuilder::Add(const Slice& key, const Slice& value) {
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status_ = Status::Corruption("Hash Table is full.");
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return;
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}
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unsigned int bucket_id;
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uint64_t bucket_id;
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bool bucket_found = false;
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autovector<unsigned int> hash_vals;
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autovector<uint64_t> hash_vals;
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ParsedInternalKey ikey;
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if (!ParseInternalKey(key, &ikey)) {
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status_ = Status::Corruption("Unable to parse key into inernal key.");
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return;
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}
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Slice user_key = ikey.user_key;
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for (unsigned int hash_cnt = 0; hash_cnt < num_hash_table_; ++hash_cnt) {
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unsigned int hash_val = GetSliceHash(user_key, hash_cnt, max_num_buckets_);
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for (uint32_t hash_cnt = 0; hash_cnt < num_hash_table_; ++hash_cnt) {
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uint64_t hash_val = GetSliceHash(user_key, hash_cnt, max_num_buckets_);
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if (buckets_[hash_val].is_empty) {
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bucket_id = hash_val;
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bucket_found = true;
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@ -98,10 +99,9 @@ void CuckooTableBuilder::Add(const Slice& key, const Slice& value) {
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}
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// We don't really need to rehash the entire table because old hashes are
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// still valid and we only increased the number of hash functions.
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unsigned int old_num_hash = num_hash_table_;
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num_hash_table_ = std::min(num_hash_table_ + 1, max_num_hash_table_);
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for (unsigned int i = old_num_hash; i < num_hash_table_; i++) {
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unsigned int hash_val = GetSliceHash(user_key, i, max_num_buckets_);
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uint64_t hash_val = GetSliceHash(user_key,
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num_hash_table_, max_num_buckets_);
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++num_hash_table_;
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if (buckets_[hash_val].is_empty) {
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bucket_found = true;
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bucket_id = hash_val;
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@ -110,15 +110,10 @@ void CuckooTableBuilder::Add(const Slice& key, const Slice& value) {
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hash_vals.push_back(hash_val);
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}
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}
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}
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buckets_[bucket_id].key = key;
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buckets_[bucket_id].value = value;
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buckets_[bucket_id].is_empty = false;
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if (ikey.sequence != 0) {
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// This is not a last level file.
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is_last_level_file_ = false;
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}
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properties_.num_entries++;
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// We assume that the keys are inserted in sorted order. To identify an
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@ -169,10 +164,11 @@ Status CuckooTableBuilder::Finish() {
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AppendInternalKey(&unused_bucket, ikey);
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}
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properties_.fixed_key_len = unused_bucket.size();
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unsigned int bucket_size = unused_bucket.size() + value_length_;
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// Resize to bucket size.
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unused_bucket.resize(bucket_size, 'a');
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properties_.user_collected_properties[
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CuckooTablePropertyNames::kValueLength].assign(
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reinterpret_cast<const char*>(&value_length_), sizeof(value_length_));
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unused_bucket.resize(bucket_size_, 'a');
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// Write the table.
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for (auto& bucket : buckets_) {
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Status s;
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@ -197,16 +193,20 @@ Status CuckooTableBuilder::Finish() {
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}
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}
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unsigned int offset = buckets_.size() * bucket_size;
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uint64_t offset = buckets_.size() * bucket_size_;
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unused_bucket.resize(properties_.fixed_key_len);
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properties_.user_collected_properties[
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CuckooTablePropertyNames::kEmptyBucket] = unused_bucket;
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CuckooTablePropertyNames::kEmptyKey] = unused_bucket;
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properties_.user_collected_properties[
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CuckooTablePropertyNames::kNumHashTable] = std::to_string(num_hash_table_);
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PutVarint32(&properties_.user_collected_properties[
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CuckooTablePropertyNames::kMaxNumBuckets], max_num_buckets_);
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CuckooTablePropertyNames::kNumHashTable].assign(
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reinterpret_cast<char*>(&num_hash_table_), sizeof(num_hash_table_));
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properties_.user_collected_properties[
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CuckooTablePropertyNames::kMaxNumBuckets].assign(
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reinterpret_cast<const char*>(&max_num_buckets_),
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sizeof(max_num_buckets_));
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// Write meta blocks.
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MetaIndexBuilder meta_index_builer;
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MetaIndexBuilder meta_index_builder;
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PropertyBlockBuilder property_block_builder;
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property_block_builder.AddTableProperty(properties_);
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@ -221,8 +221,8 @@ Status CuckooTableBuilder::Finish() {
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return s;
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}
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meta_index_builer.Add(kPropertiesBlock, property_block_handle);
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Slice meta_index_block = meta_index_builer.Finish();
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meta_index_builder.Add(kPropertiesBlock, property_block_handle);
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Slice meta_index_block = meta_index_builder.Finish();
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BlockHandle meta_index_block_handle;
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meta_index_block_handle.set_offset(offset);
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@ -262,44 +262,52 @@ uint64_t CuckooTableBuilder::FileSize() const {
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}
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bool CuckooTableBuilder::MakeSpaceForKey(const Slice& key,
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unsigned int *bucket_id, autovector<unsigned int> hash_vals) {
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uint64_t *bucket_id, autovector<uint64_t> hash_vals) {
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struct CuckooNode {
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unsigned int bucket_id;
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unsigned int depth;
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uint64_t bucket_id;
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uint32_t depth;
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int parent_pos;
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CuckooNode(unsigned int bucket_id, unsigned int depth, int parent_pos)
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CuckooNode(uint64_t bucket_id, uint32_t depth, int parent_pos)
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: bucket_id(bucket_id), depth(depth), parent_pos(parent_pos) {}
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};
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// This is BFS search tree that is stored simply as a vector.
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// Each node stores the index of parent node in the vector.
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std::vector<CuckooNode> tree;
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// This is a very bad way to keep track of visited nodes.
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// TODO(rbs): Change this by adding a 'GetKeyPathId' field to the bucket
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// and use it to track visited nodes.
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std::vector<bool> buckets_visited(max_num_buckets_, false);
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for (unsigned int hash_cnt = 0; hash_cnt < num_hash_table_; ++hash_cnt) {
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unsigned int bucket_id = hash_vals[hash_cnt];
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buckets_visited[bucket_id] = true;
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// We want to identify already visited buckets in the current method call so
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// that we don't add same buckets again for exploration in the tree.
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// We do this by maintaining a count of current method call, which acts as a
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// unique id for this invocation of the method. We store this number into
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// the nodes that we explore in current method call.
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// It is unlikely for the increment operation to overflow because the maximum
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// number of times this will be called is <= max_num_hash_table_ +
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// max_num_buckets_.
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++make_space_for_key_call_id_;
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for (uint32_t hash_cnt = 0; hash_cnt < num_hash_table_; ++hash_cnt) {
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uint64_t bucket_id = hash_vals[hash_cnt];
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buckets_[bucket_id].make_space_for_key_call_id =
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make_space_for_key_call_id_;
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tree.push_back(CuckooNode(bucket_id, 0, -1));
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}
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bool null_found = false;
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unsigned int curr_pos = 0;
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uint32_t curr_pos = 0;
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while (!null_found && curr_pos < tree.size()) {
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CuckooNode& curr_node = tree[curr_pos];
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if (curr_node.depth >= max_search_depth_) {
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break;
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}
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CuckooBucket& curr_bucket = buckets_[curr_node.bucket_id];
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for (unsigned int hash_cnt = 0; hash_cnt < num_hash_table_; ++hash_cnt) {
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unsigned int child_bucket_id = GetSliceHash(
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for (uint32_t hash_cnt = 0; hash_cnt < num_hash_table_; ++hash_cnt) {
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uint64_t child_bucket_id = GetSliceHash(
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ExtractUserKey(curr_bucket.key), hash_cnt, max_num_buckets_);
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if (child_bucket_id == curr_node.bucket_id) {
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continue;
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}
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if (buckets_visited[child_bucket_id]) {
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if (buckets_[child_bucket_id].make_space_for_key_call_id ==
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make_space_for_key_call_id_) {
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continue;
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}
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buckets_visited[child_bucket_id] = true;
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buckets_[child_bucket_id].make_space_for_key_call_id =
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make_space_for_key_call_id_;
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tree.push_back(CuckooNode(child_bucket_id, curr_node.depth + 1,
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curr_pos));
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if (buckets_[child_bucket_id].is_empty) {
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@ -1,4 +1,4 @@
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// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// Copyright (c) 2014, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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@ -16,22 +16,14 @@
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namespace rocksdb {
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struct CuckooBucket {
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CuckooBucket(): is_empty(true) {}
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Slice key;
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Slice value;
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bool is_empty;
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};
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class CuckooTableBuilder: public TableBuilder {
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public:
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CuckooTableBuilder(
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WritableFile* file, unsigned int fixed_key_length,
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unsigned int fixed_value_length, double hash_table_ratio,
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unsigned int file_size, unsigned int max_num_hash_table,
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unsigned int max_search_depth,
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unsigned int (*GetSliceHash)(const Slice&, unsigned int,
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unsigned int));
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WritableFile* file, uint32_t fixed_key_length,
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uint32_t fixed_value_length, double hash_table_ratio,
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uint64_t file_size, uint32_t max_num_hash_table,
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uint32_t max_search_depth, bool is_last_level,
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uint64_t (*GetSliceHash)(const Slice&, uint32_t, uint64_t));
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// REQUIRES: Either Finish() or Abandon() has been called.
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~CuckooTableBuilder();
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@ -64,23 +56,32 @@ class CuckooTableBuilder: public TableBuilder {
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uint64_t FileSize() const override;
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private:
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bool MakeSpaceForKey(const Slice& key, unsigned int* bucket_id,
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autovector<unsigned int> hash_vals);
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struct CuckooBucket {
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CuckooBucket(): is_empty(true), make_space_for_key_call_id(0) {}
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Slice key;
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Slice value;
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bool is_empty;
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uint64_t make_space_for_key_call_id;
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};
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unsigned int num_hash_table_;
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bool MakeSpaceForKey(const Slice& key, uint64_t* bucket_id,
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autovector<uint64_t> hash_vals);
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uint32_t num_hash_table_;
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WritableFile* file_;
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const unsigned int value_length_;
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const unsigned int bucket_size_;
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const uint32_t value_length_;
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const uint32_t bucket_size_;
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const double hash_table_ratio_;
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const unsigned int max_num_buckets_;
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const unsigned int max_num_hash_table_;
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const unsigned int max_search_depth_;
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const uint64_t max_num_buckets_;
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const uint32_t max_num_hash_table_;
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const uint32_t max_search_depth_;
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const bool is_last_level_file_;
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Status status_;
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std::vector<CuckooBucket> buckets_;
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bool is_last_level_file_ = true;
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TableProperties properties_;
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unsigned int (*GetSliceHash)(const Slice& s, unsigned int index,
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unsigned int max_num_buckets);
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uint64_t make_space_for_key_call_id_;
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uint64_t (*GetSliceHash)(const Slice& s, uint32_t index,
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uint64_t max_num_buckets);
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std::string unused_user_key_ = "";
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std::string prev_key_;
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@ -1,4 +1,4 @@
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// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// Copyright (c) 2014, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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@ -19,20 +19,19 @@ namespace rocksdb {
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extern const uint64_t kCuckooTableMagicNumber;
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namespace {
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std::unordered_map<std::string, std::vector<unsigned int>> hash_map;
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std::unordered_map<std::string, std::vector<uint64_t>> hash_map;
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void AddHashLookups(const std::string& s, unsigned int bucket_id,
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unsigned int num_hash_fun) {
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std::vector<unsigned int> v;
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for (unsigned int i = 0; i < num_hash_fun; i++) {
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void AddHashLookups(const std::string& s, uint64_t bucket_id,
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uint32_t num_hash_fun) {
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std::vector<uint64_t> v;
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for (uint32_t i = 0; i < num_hash_fun; i++) {
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v.push_back(bucket_id + i);
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}
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hash_map[s] = v;
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return;
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}
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unsigned int GetSliceHash(const Slice& s, unsigned int index,
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unsigned int max_num_buckets) {
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uint64_t GetSliceHash(const Slice& s, uint32_t index,
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uint64_t max_num_buckets) {
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return hash_map[s.ToString()][index];
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}
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} // namespace
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@ -43,7 +42,9 @@ class CuckooBuilderTest {
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env_ = Env::Default();
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}
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void CheckFileContents(const std::string& expected_data) {
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void CheckFileContents(const std::string& expected_data,
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std::string expected_unused_bucket, uint64_t expected_max_buckets,
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uint32_t expected_num_hash_fun) {
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// Read file
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unique_ptr<RandomAccessFile> read_file;
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ASSERT_OK(env_->NewRandomAccessFile(fname, &read_file, env_options_));
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@ -58,15 +59,22 @@ class CuckooBuilderTest {
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ASSERT_EQ(props->fixed_key_len, key_length);
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// Check unused bucket.
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std::string unused_bucket = props->user_collected_properties[
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CuckooTablePropertyNames::kEmptyBucket];
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ASSERT_EQ(expected_unused_bucket, unused_bucket);
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std::string unused_key = props->user_collected_properties[
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CuckooTablePropertyNames::kEmptyKey];
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ASSERT_EQ(expected_unused_bucket.substr(0, key_length), unused_key);
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unsigned int max_buckets;
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Slice max_buckets_slice = Slice(props->user_collected_properties[
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CuckooTablePropertyNames::kMaxNumBuckets]);
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GetVarint32(&max_buckets_slice, &max_buckets);
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uint32_t value_len_found =
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*reinterpret_cast<const uint32_t*>(props->user_collected_properties[
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CuckooTablePropertyNames::kValueLength].data());
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ASSERT_EQ(value_length, value_len_found);
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const uint64_t max_buckets =
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*reinterpret_cast<const uint64_t*>(props->user_collected_properties[
|
||||
CuckooTablePropertyNames::kMaxNumBuckets].data());
|
||||
ASSERT_EQ(expected_max_buckets, max_buckets);
|
||||
const uint32_t num_hash_fun_found =
|
||||
*reinterpret_cast<const uint32_t*>(props->user_collected_properties[
|
||||
CuckooTablePropertyNames::kNumHashTable].data());
|
||||
ASSERT_EQ(expected_num_hash_fun, num_hash_fun_found);
|
||||
delete props;
|
||||
// Check contents of the bucket.
|
||||
std::string read_data;
|
||||
@ -80,28 +88,25 @@ class CuckooBuilderTest {
|
||||
Env* env_;
|
||||
const EnvOptions env_options_;
|
||||
std::string fname;
|
||||
std::string expected_unused_bucket;
|
||||
unsigned int file_size = 100000;
|
||||
unsigned int num_items = 20;
|
||||
unsigned int num_hash_fun = 64;
|
||||
uint64_t file_size = 100000;
|
||||
uint32_t num_items = 20;
|
||||
uint32_t num_hash_fun = 64;
|
||||
double hash_table_ratio = 0.9;
|
||||
unsigned int ikey_length;
|
||||
unsigned int user_key_length;
|
||||
unsigned int key_length;
|
||||
unsigned int value_length;
|
||||
unsigned int bucket_length;
|
||||
unsigned int expected_max_buckets;
|
||||
uint32_t ikey_length;
|
||||
uint32_t user_key_length;
|
||||
uint32_t key_length;
|
||||
uint32_t value_length;
|
||||
uint32_t bucket_length;
|
||||
};
|
||||
|
||||
TEST(CuckooBuilderTest, NoCollision) {
|
||||
hash_map.clear();
|
||||
num_items = 20;
|
||||
num_hash_fun = 64;
|
||||
uint32_t expected_num_hash_fun = 2;
|
||||
std::vector<std::string> user_keys(num_items);
|
||||
std::vector<std::string> keys(num_items);
|
||||
std::vector<std::string> values(num_items);
|
||||
unsigned int bucket_ids = 0;
|
||||
for (unsigned int i = 0; i < num_items; i++) {
|
||||
uint64_t bucket_ids = 0;
|
||||
for (uint32_t i = 0; i < num_items; i++) {
|
||||
user_keys[i] = "keys" + std::to_string(i+100);
|
||||
ParsedInternalKey ikey(user_keys[i], i + 1000, kTypeValue);
|
||||
AppendInternalKey(&keys[i], ikey);
|
||||
@ -114,9 +119,10 @@ TEST(CuckooBuilderTest, NoCollision) {
|
||||
key_length = ikey_length;
|
||||
value_length = values[0].size();
|
||||
bucket_length = ikey_length + value_length;
|
||||
expected_max_buckets = file_size / bucket_length;
|
||||
uint64_t expected_max_buckets = file_size / bucket_length;
|
||||
std::string expected_unused_user_key = "keys10:";
|
||||
ParsedInternalKey ikey(expected_unused_user_key, 0, kTypeValue);
|
||||
std::string expected_unused_bucket;
|
||||
AppendInternalKey(&expected_unused_bucket, ikey);
|
||||
expected_unused_bucket.resize(bucket_length, 'a');
|
||||
unique_ptr<WritableFile> writable_file;
|
||||
@ -125,11 +131,11 @@ TEST(CuckooBuilderTest, NoCollision) {
|
||||
CuckooTableBuilder cuckoo_builder(
|
||||
writable_file.get(), ikey_length,
|
||||
value_length, hash_table_ratio,
|
||||
file_size, num_hash_fun, 100, GetSliceHash);
|
||||
file_size, num_hash_fun, 100, false, GetSliceHash);
|
||||
ASSERT_OK(cuckoo_builder.status());
|
||||
unsigned int key_idx = 0;
|
||||
uint32_t key_idx = 0;
|
||||
std::string expected_file_data = "";
|
||||
for (unsigned int i = 0; i < expected_max_buckets; i++) {
|
||||
for (uint32_t i = 0; i < expected_max_buckets; i++) {
|
||||
if (key_idx * num_hash_fun == i && key_idx < num_items) {
|
||||
cuckoo_builder.Add(Slice(keys[key_idx]), Slice(values[key_idx]));
|
||||
ASSERT_EQ(cuckoo_builder.NumEntries(), key_idx + 1);
|
||||
@ -142,16 +148,18 @@ TEST(CuckooBuilderTest, NoCollision) {
|
||||
}
|
||||
ASSERT_OK(cuckoo_builder.Finish());
|
||||
writable_file->Close();
|
||||
CheckFileContents(expected_file_data);
|
||||
CheckFileContents(expected_file_data, expected_unused_bucket,
|
||||
expected_max_buckets, expected_num_hash_fun);
|
||||
}
|
||||
|
||||
TEST(CuckooBuilderTest, NoCollisionLastLevel) {
|
||||
hash_map.clear();
|
||||
uint32_t expected_num_hash_fun = 2;
|
||||
std::vector<std::string> user_keys(num_items);
|
||||
std::vector<std::string> keys(num_items);
|
||||
std::vector<std::string> values(num_items);
|
||||
unsigned int bucket_ids = 0;
|
||||
for (unsigned int i = 0; i < num_items; i++) {
|
||||
uint64_t bucket_ids = 0;
|
||||
for (uint32_t i = 0; i < num_items; i++) {
|
||||
user_keys[i] = "keys" + std::to_string(i+100);
|
||||
// Set zero sequence number in all keys.
|
||||
ParsedInternalKey ikey(user_keys[i], 0, kTypeValue);
|
||||
@ -165,20 +173,20 @@ TEST(CuckooBuilderTest, NoCollisionLastLevel) {
|
||||
key_length = user_key_length;
|
||||
value_length = values[0].size();
|
||||
bucket_length = key_length + value_length;
|
||||
expected_max_buckets = file_size / bucket_length;
|
||||
expected_unused_bucket = "keys10:";
|
||||
uint64_t expected_max_buckets = file_size / bucket_length;
|
||||
std::string expected_unused_bucket = "keys10:";
|
||||
expected_unused_bucket.resize(bucket_length, 'a');
|
||||
unique_ptr<WritableFile> writable_file;
|
||||
fname = test::TmpDir() + "/NoCollisionLastLevel_writable_file";
|
||||
ASSERT_OK(env_->NewWritableFile(fname, &writable_file, env_options_));
|
||||
CuckooTableBuilder cuckoo_builder(
|
||||
writable_file.get(), key_length,
|
||||
writable_file.get(), ikey_length,
|
||||
value_length, hash_table_ratio,
|
||||
file_size, num_hash_fun, 100, GetSliceHash);
|
||||
file_size, num_hash_fun, 100, true, GetSliceHash);
|
||||
ASSERT_OK(cuckoo_builder.status());
|
||||
unsigned int key_idx = 0;
|
||||
uint32_t key_idx = 0;
|
||||
std::string expected_file_data = "";
|
||||
for (unsigned int i = 0; i < expected_max_buckets; i++) {
|
||||
for (uint32_t i = 0; i < expected_max_buckets; i++) {
|
||||
if (key_idx * num_hash_fun == i && key_idx < num_items) {
|
||||
cuckoo_builder.Add(Slice(keys[key_idx]), Slice(values[key_idx]));
|
||||
ASSERT_EQ(cuckoo_builder.NumEntries(), key_idx + 1);
|
||||
@ -191,7 +199,8 @@ TEST(CuckooBuilderTest, NoCollisionLastLevel) {
|
||||
}
|
||||
ASSERT_OK(cuckoo_builder.Finish());
|
||||
writable_file->Close();
|
||||
CheckFileContents(expected_file_data);
|
||||
CheckFileContents(expected_file_data, expected_unused_bucket,
|
||||
expected_max_buckets, expected_num_hash_fun);
|
||||
}
|
||||
|
||||
TEST(CuckooBuilderTest, WithCollision) {
|
||||
@ -199,10 +208,11 @@ TEST(CuckooBuilderTest, WithCollision) {
|
||||
hash_map.clear();
|
||||
num_hash_fun = 20;
|
||||
num_items = num_hash_fun;
|
||||
uint32_t expected_num_hash_fun = num_hash_fun;
|
||||
std::vector<std::string> user_keys(num_items);
|
||||
std::vector<std::string> keys(num_items);
|
||||
std::vector<std::string> values(num_items);
|
||||
for (unsigned int i = 0; i < num_items; i++) {
|
||||
for (uint32_t i = 0; i < num_items; i++) {
|
||||
user_keys[i] = "keys" + std::to_string(i+100);
|
||||
ParsedInternalKey ikey(user_keys[i], i + 1000, kTypeValue);
|
||||
AppendInternalKey(&keys[i], ikey);
|
||||
@ -214,9 +224,10 @@ TEST(CuckooBuilderTest, WithCollision) {
|
||||
value_length = values[0].size();
|
||||
key_length = ikey_length;
|
||||
bucket_length = key_length + value_length;
|
||||
expected_max_buckets = file_size / bucket_length;
|
||||
uint64_t expected_max_buckets = file_size / bucket_length;
|
||||
std::string expected_unused_user_key = "keys10:";
|
||||
ParsedInternalKey ikey(expected_unused_user_key, 0, kTypeValue);
|
||||
std::string expected_unused_bucket;
|
||||
AppendInternalKey(&expected_unused_bucket, ikey);
|
||||
expected_unused_bucket.resize(bucket_length, 'a');
|
||||
unique_ptr<WritableFile> writable_file;
|
||||
@ -224,11 +235,11 @@ TEST(CuckooBuilderTest, WithCollision) {
|
||||
ASSERT_OK(env_->NewWritableFile(fname, &writable_file, env_options_));
|
||||
CuckooTableBuilder cuckoo_builder(
|
||||
writable_file.get(), key_length, value_length, hash_table_ratio,
|
||||
file_size, num_hash_fun, 100, GetSliceHash);
|
||||
file_size, num_hash_fun, 100, false, GetSliceHash);
|
||||
ASSERT_OK(cuckoo_builder.status());
|
||||
unsigned int key_idx = 0;
|
||||
uint32_t key_idx = 0;
|
||||
std::string expected_file_data = "";
|
||||
for (unsigned int i = 0; i < expected_max_buckets; i++) {
|
||||
for (uint32_t i = 0; i < expected_max_buckets; i++) {
|
||||
if (key_idx == i && key_idx < num_items) {
|
||||
cuckoo_builder.Add(Slice(keys[key_idx]), Slice(values[key_idx]));
|
||||
ASSERT_EQ(cuckoo_builder.NumEntries(), key_idx + 1);
|
||||
@ -241,7 +252,8 @@ TEST(CuckooBuilderTest, WithCollision) {
|
||||
}
|
||||
ASSERT_OK(cuckoo_builder.Finish());
|
||||
writable_file->Close();
|
||||
CheckFileContents(expected_file_data);
|
||||
CheckFileContents(expected_file_data, expected_unused_bucket,
|
||||
expected_max_buckets, expected_num_hash_fun);
|
||||
}
|
||||
|
||||
TEST(CuckooBuilderTest, FailWithTooManyCollisions) {
|
||||
@ -253,7 +265,7 @@ TEST(CuckooBuilderTest, FailWithTooManyCollisions) {
|
||||
std::vector<std::string> user_keys(num_items);
|
||||
std::vector<std::string> keys(num_items);
|
||||
std::vector<std::string> values(num_items);
|
||||
for (unsigned int i = 0; i < num_items; i++) {
|
||||
for (uint32_t i = 0; i < num_items; i++) {
|
||||
user_keys[i] = "keys" + std::to_string(i+100);
|
||||
ParsedInternalKey ikey(user_keys[i], i + 1000, kTypeValue);
|
||||
AppendInternalKey(&keys[i], ikey);
|
||||
@ -269,9 +281,9 @@ TEST(CuckooBuilderTest, FailWithTooManyCollisions) {
|
||||
CuckooTableBuilder cuckoo_builder(
|
||||
writable_file.get(), ikey_length,
|
||||
value_length, hash_table_ratio, file_size, num_hash_fun,
|
||||
100, GetSliceHash);
|
||||
100, false, GetSliceHash);
|
||||
ASSERT_OK(cuckoo_builder.status());
|
||||
for (unsigned int key_idx = 0; key_idx < num_items-1; key_idx++) {
|
||||
for (uint32_t key_idx = 0; key_idx < num_items-1; key_idx++) {
|
||||
cuckoo_builder.Add(Slice(keys[key_idx]), Slice(values[key_idx]));
|
||||
ASSERT_OK(cuckoo_builder.status());
|
||||
ASSERT_EQ(cuckoo_builder.NumEntries(), key_idx + 1);
|
||||
@ -300,7 +312,7 @@ TEST(CuckooBuilderTest, FailWhenSameKeyInserted) {
|
||||
CuckooTableBuilder cuckoo_builder(
|
||||
writable_file.get(), ikey_length,
|
||||
value_length, hash_table_ratio, file_size, num_hash_fun,
|
||||
100, GetSliceHash);
|
||||
100, false, GetSliceHash);
|
||||
ASSERT_OK(cuckoo_builder.status());
|
||||
cuckoo_builder.Add(Slice(key_to_reuse1), Slice(value));
|
||||
ASSERT_OK(cuckoo_builder.status());
|
||||
@ -316,14 +328,14 @@ TEST(CuckooBuilderTest, WithACollisionPath) {
|
||||
// Have two hash functions. Insert elements with overlapping hashes.
|
||||
// Finally insert an element which will displace all the current elements.
|
||||
num_hash_fun = 2;
|
||||
|
||||
unsigned int max_search_depth = 100;
|
||||
uint32_t expected_num_hash_fun = num_hash_fun;
|
||||
uint32_t max_search_depth = 100;
|
||||
num_items = max_search_depth + 2;
|
||||
std::vector<std::string> user_keys(num_items);
|
||||
std::vector<std::string> keys(num_items);
|
||||
std::vector<std::string> values(num_items);
|
||||
std::vector<unsigned int> expected_bucket_id(num_items);
|
||||
for (unsigned int i = 0; i < num_items - 1; i++) {
|
||||
std::vector<uint64_t> expected_bucket_id(num_items);
|
||||
for (uint32_t i = 0; i < num_items - 1; i++) {
|
||||
user_keys[i] = "keys" + std::to_string(i+100);
|
||||
ParsedInternalKey ikey(user_keys[i], i + 1000, kTypeValue);
|
||||
AppendInternalKey(&keys[i], ikey);
|
||||
@ -346,13 +358,14 @@ TEST(CuckooBuilderTest, WithACollisionPath) {
|
||||
key_length = ikey_length;
|
||||
bucket_length = key_length + value_length;
|
||||
|
||||
expected_max_buckets = file_size / bucket_length;
|
||||
uint64_t expected_max_buckets = file_size / bucket_length;
|
||||
std::string expected_unused_user_key = "keys10:";
|
||||
ikey = ParsedInternalKey(expected_unused_user_key, 0, kTypeValue);
|
||||
std::string expected_unused_bucket;
|
||||
AppendInternalKey(&expected_unused_bucket, ikey);
|
||||
expected_unused_bucket.resize(bucket_length, 'a');
|
||||
std::string expected_file_data = "";
|
||||
for (unsigned int i = 0; i < expected_max_buckets; i++) {
|
||||
for (uint32_t i = 0; i < expected_max_buckets; i++) {
|
||||
expected_file_data += expected_unused_bucket;
|
||||
}
|
||||
|
||||
@ -362,9 +375,9 @@ TEST(CuckooBuilderTest, WithACollisionPath) {
|
||||
CuckooTableBuilder cuckoo_builder(
|
||||
writable_file.get(), key_length,
|
||||
value_length, hash_table_ratio, file_size,
|
||||
num_hash_fun, max_search_depth, GetSliceHash);
|
||||
num_hash_fun, max_search_depth, false, GetSliceHash);
|
||||
ASSERT_OK(cuckoo_builder.status());
|
||||
for (unsigned int key_idx = 0; key_idx < num_items; key_idx++) {
|
||||
for (uint32_t key_idx = 0; key_idx < num_items; key_idx++) {
|
||||
cuckoo_builder.Add(Slice(keys[key_idx]), Slice(values[key_idx]));
|
||||
ASSERT_OK(cuckoo_builder.status());
|
||||
ASSERT_EQ(cuckoo_builder.NumEntries(), key_idx + 1);
|
||||
@ -373,7 +386,8 @@ TEST(CuckooBuilderTest, WithACollisionPath) {
|
||||
}
|
||||
ASSERT_OK(cuckoo_builder.Finish());
|
||||
writable_file->Close();
|
||||
CheckFileContents(expected_file_data);
|
||||
CheckFileContents(expected_file_data, expected_unused_bucket,
|
||||
expected_max_buckets, expected_num_hash_fun);
|
||||
}
|
||||
|
||||
TEST(CuckooBuilderTest, FailWhenCollisionPathTooLong) {
|
||||
@ -382,12 +396,12 @@ TEST(CuckooBuilderTest, FailWhenCollisionPathTooLong) {
|
||||
// Finally insert an element which will displace all the current elements.
|
||||
num_hash_fun = 2;
|
||||
|
||||
unsigned int max_search_depth = 100;
|
||||
uint32_t max_search_depth = 100;
|
||||
num_items = max_search_depth + 3;
|
||||
std::vector<std::string> user_keys(num_items);
|
||||
std::vector<std::string> keys(num_items);
|
||||
std::vector<std::string> values(num_items);
|
||||
for (unsigned int i = 0; i < num_items - 1; i++) {
|
||||
for (uint32_t i = 0; i < num_items - 1; i++) {
|
||||
user_keys[i] = "keys" + std::to_string(i+100);
|
||||
ParsedInternalKey ikey(user_keys[i], i + 1000, kTypeValue);
|
||||
AppendInternalKey(&keys[i], ikey);
|
||||
@ -410,9 +424,9 @@ TEST(CuckooBuilderTest, FailWhenCollisionPathTooLong) {
|
||||
CuckooTableBuilder cuckoo_builder(
|
||||
writable_file.get(), ikey_length,
|
||||
value_length, hash_table_ratio, file_size, num_hash_fun,
|
||||
max_search_depth, GetSliceHash);
|
||||
max_search_depth, false, GetSliceHash);
|
||||
ASSERT_OK(cuckoo_builder.status());
|
||||
for (unsigned int key_idx = 0; key_idx < num_items-1; key_idx++) {
|
||||
for (uint32_t key_idx = 0; key_idx < num_items-1; key_idx++) {
|
||||
cuckoo_builder.Add(Slice(keys[key_idx]), Slice(values[key_idx]));
|
||||
ASSERT_OK(cuckoo_builder.status());
|
||||
ASSERT_EQ(cuckoo_builder.NumEntries(), key_idx + 1);
|
||||
@ -431,7 +445,7 @@ TEST(CuckooBuilderTest, FailWhenTableIsFull) {
|
||||
std::vector<std::string> user_keys(num_items);
|
||||
std::vector<std::string> keys(num_items);
|
||||
std::vector<std::string> values(num_items);
|
||||
for (unsigned int i = 0; i < num_items; i++) {
|
||||
for (uint32_t i = 0; i < num_items; i++) {
|
||||
user_keys[i] = "keys" + std::to_string(i+1000);
|
||||
ParsedInternalKey ikey(user_keys[i], i + 1000, kTypeValue);
|
||||
AppendInternalKey(&keys[i], ikey);
|
||||
@ -451,9 +465,9 @@ TEST(CuckooBuilderTest, FailWhenTableIsFull) {
|
||||
CuckooTableBuilder cuckoo_builder(
|
||||
writable_file.get(), ikey_length,
|
||||
value_length, hash_table_ratio, file_size, num_hash_fun,
|
||||
100, GetSliceHash);
|
||||
100, false, GetSliceHash);
|
||||
ASSERT_OK(cuckoo_builder.status());
|
||||
for (unsigned int key_idx = 0; key_idx < num_items-1; key_idx++) {
|
||||
for (uint32_t key_idx = 0; key_idx < num_items-1; key_idx++) {
|
||||
cuckoo_builder.Add(Slice(keys[key_idx]), Slice(values[key_idx]));
|
||||
ASSERT_OK(cuckoo_builder.status());
|
||||
ASSERT_EQ(cuckoo_builder.NumEntries(), key_idx + 1);
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
|
||||
// Copyright (c) 2014, 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.
|
||||
@ -10,11 +10,11 @@
|
||||
|
||||
namespace rocksdb {
|
||||
|
||||
static const unsigned int kMaxNumHashTable = 64;
|
||||
static const uint32_t kMaxNumHashTable = 64;
|
||||
|
||||
unsigned int GetSliceMurmurHash(const Slice& s, unsigned int index,
|
||||
unsigned int max_num_buckets) {
|
||||
static constexpr unsigned int seeds[kMaxNumHashTable] = {
|
||||
uint64_t GetSliceMurmurHash(const Slice& s, uint32_t index,
|
||||
uint64_t max_num_buckets) {
|
||||
static constexpr uint32_t seeds[kMaxNumHashTable] = {
|
||||
816922183, 506425713, 949485004, 22513986, 421427259, 500437285,
|
||||
888981693, 847587269, 511007211, 722295391, 934013645, 566947683,
|
||||
193618736, 428277388, 770956674, 819994962, 755946528, 40807421,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user