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BlockBasedTable::PrefixMayMatch: no need to find data block after full bloom checking 

Summary:
Full block checking should be a good enough indication of prefix existance. No need to further check data block.
This also fixes wrong results when using prefix bloom and reverse bitwise comparator.

Test Plan: Will add a unit test.

Reviewers: yhchiang, IslamAbdelRahman

Reviewed By: IslamAbdelRahman

Subscribers: hermanlee4, yoshinorim, yiwu, kradhakrishnan, leveldb, andrewkr, dhruba

Differential Revision: https://reviews.facebook.net/D56625
This commit is contained in:
sdong 2016-04-12 13:56:24 -07:00
parent 0353b853cb
commit dff4c48ede
2 changed files with 41 additions and 4 deletions
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39
db/db_test2.cc
View File

@ -23,6 +23,45 @@ class DBTest2 : public DBTestBase {
DBTest2() : DBTestBase("/db_test2") {}
};
TEST_F(DBTest2, PrefixFullBloomWithReverseComparator) {
Options options = last_options_;
options.comparator = ReverseBytewiseComparator();
options.prefix_extractor.reset(NewCappedPrefixTransform(3));
options.statistics = rocksdb::CreateDBStatistics();
BlockBasedTableOptions bbto;
bbto.filter_policy.reset(NewBloomFilterPolicy(10, false));
bbto.whole_key_filtering = false;
options.table_factory.reset(NewBlockBasedTableFactory(bbto));
DestroyAndReopen(options);
ASSERT_OK(dbfull()->Put(WriteOptions(), "bar123", "foo"));
ASSERT_OK(dbfull()->Put(WriteOptions(), "bar234", "foo2"));
ASSERT_OK(dbfull()->Put(WriteOptions(), "foo123", "foo3"));
dbfull()->Flush(FlushOptions());
unique_ptr<Iterator> iter(db_->NewIterator(ReadOptions()));
iter->Seek("bar345");
ASSERT_OK(iter->status());
ASSERT_TRUE(iter->Valid());
ASSERT_EQ("bar234", iter->key().ToString());
ASSERT_EQ("foo2", iter->value().ToString());
iter->Next();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ("bar123", iter->key().ToString());
ASSERT_EQ("foo", iter->value().ToString());
iter->Seek("foo234");
ASSERT_OK(iter->status());
ASSERT_TRUE(iter->Valid());
ASSERT_EQ("foo123", iter->key().ToString());
ASSERT_EQ("foo3", iter->value().ToString());
iter->Seek("bar");
ASSERT_OK(iter->status());
ASSERT_TRUE(!iter->Valid());
}
TEST_F(DBTest2, IteratorPropertyVersionNumber) {
Put("", "");
Iterator* iter1 = db_->NewIterator(ReadOptions());

6
table/block_based_table_reader.cc
View File

@ -1226,10 +1226,8 @@ bool BlockBasedTable::PrefixMayMatch(const Slice& internal_key) {
FilterBlockReader* filter = filter_entry.value;
if (filter != nullptr && !filter->IsBlockBased()) {
may_match = filter->PrefixMayMatch(prefix);
}
// Then, try find it within each block
if (may_match) {
} else {
// Then, try find it within each block
unique_ptr<InternalIterator> iiter(NewIndexIterator(no_io_read_options));
iiter->Seek(internal_prefix);