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Prefix scan: db_bench and bug fixes

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Summary: If use_prefix_filters is set and read_range>1, then the random seeks will set a the prefix filter to be the prefix of the key which was randomly selected as the target.  Still need to add statistics (perhaps in a separate diff).

Test Plan: ./db_bench --benchmarks=fillseq,prefixscanrandom --num=10000000 --statistics=1 --use_prefix_blooms=1 --use_prefix_api=1 --bloom_bits=10

Reviewers: dhruba

Reviewed By: dhruba

CC: leveldb, haobo

Differential Revision: https://reviews.facebook.net/D12273
This commit is contained in:
Tyler Harter
2013-08-22 16:06:50 -07:00
parent 60bf2b7d4a
commit c2bd8f4824
10 changed files with 164 additions and 16 deletions
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18
db/table_cache.cc
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@@ -135,6 +135,24 @@ Status TableCache::Get(const ReadOptions& options,
return s;
}
bool TableCache::PrefixMayMatch(const ReadOptions& options,
uint64_t file_number,
uint64_t file_size,
const Slice& internal_prefix,
bool* table_io) {
Cache::Handle* handle = nullptr;
Status s = FindTable(storage_options_, file_number,
file_size, &handle, table_io);
bool may_match = true;
if (s.ok()) {
Table* t =
reinterpret_cast<Table*>(cache_->Value(handle));
may_match = t->PrefixMayMatch(internal_prefix);
cache_->Release(handle);
}
return may_match;
}
void TableCache::Evict(uint64_t file_number) {
char buf[sizeof(file_number)];
EncodeFixed64(buf, file_number);