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Add BloomFilter to PlainTableIterator::Seek()

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Summary:
This patch adds a simple bloom filter in PlainTableIterator::Seek()

Test Plan: N/A

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Task ID: #

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This commit is contained in:
Siying Dong
2013-11-21 15:13:45 -08:00
parent b135d01e7b
commit 718488abc5
6 changed files with 71 additions and 16 deletions
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13
include/rocksdb/plain_table_factory.h
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@@ -47,8 +47,15 @@ class PlainTableFactory: public TableFactory {
public:
~PlainTableFactory() {
}
PlainTableFactory(int user_key_size, int key_prefix_len) :
user_key_size_(user_key_size), key_prefix_len_(key_prefix_len) {
// user_key_size is the length of the user key. key_prefix_len is the
// length of the prefix used for im-memory indexes. bloom_num_bits is
// number of bits is used for bloom filer per key. hash_table_ratio is
// the desired ultilization of the hash table used for prefix hashing.
// hash_table_ratio = number of prefixes / #buckets in the hash table
PlainTableFactory(int user_key_size, int key_prefix_len,
int bloom_num_bits = 0, double hash_table_ratio = 0.75) :
user_key_size_(user_key_size), key_prefix_len_(key_prefix_len),
bloom_num_bits_(bloom_num_bits), hash_table_ratio_(hash_table_ratio) {
}
const char* Name() const override {
return "PlainTable";
@@ -64,6 +71,8 @@ public:
private:
int user_key_size_;
int key_prefix_len_;
int bloom_num_bits_;
double hash_table_ratio_;
};
} // namespace rocksdb