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Use KeyMayExist for WriteBatch-Deletes

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Summary:
Introduced KeyMayExist checking during writebatch-delete and removed from Outer Delete API because it uses writebatch-delete.
Added code to skip getting Table from disk if not already present in table_cache.
Some renaming of variables.
Introduced KeyMayExistImpl which allows checking since specified sequence number in GetImpl useful to check partially written writebatch.
Changed KeyMayExist to not be pure virtual and provided a default implementation.
Expanded unit-tests in db_test to check appropriately.
Ran db_stress for 1 hour with ./db_stress --max_key=100000 --ops_per_thread=10000000 --delpercent=50 --filter_deletes=1 --statistics=1.

Test Plan: db_stress;make check

Reviewers: dhruba, haobo

Reviewed By: dhruba

CC: leveldb, xjin

Differential Revision: https://reviews.facebook.net/D11745
This commit is contained in:
Mayank Agarwal
2013-07-12 16:56:52 -07:00
parent d364eea1fc
commit bf66c10b13
16 changed files with 155 additions and 58 deletions
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34
db/write_batch.cc
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@@ -16,8 +16,9 @@
#include "leveldb/write_batch.h"
#include "leveldb/db.h"
#include "leveldb/statistics.h"
#include "db/dbformat.h"
#include "db/db_impl.h"
#include "db/memtable.h"
#include "db/write_batch_internal.h"
#include "util/coding.h"
@@ -139,6 +140,23 @@ class MemTableInserter : public WriteBatch::Handler {
public:
SequenceNumber sequence_;
MemTable* mem_;
const Options* options_;
DBImpl* db_;
const bool filter_deletes_;
MemTableInserter(SequenceNumber sequence, MemTable* mem, const Options* opts,
DB* db, const bool filter_deletes)
: sequence_(sequence),
mem_(mem),
options_(opts),
db_(reinterpret_cast<DBImpl*>(db)),
filter_deletes_(filter_deletes) {
assert(mem_);
if (filter_deletes_) {
assert(options_);
assert(db_);
}
}
virtual void Put(const Slice& key, const Slice& value) {
mem_->Add(sequence_, kTypeValue, key, value);
@@ -149,17 +167,21 @@ class MemTableInserter : public WriteBatch::Handler {
sequence_++;
}
virtual void Delete(const Slice& key) {
if (filter_deletes_ && !db_->KeyMayExistImpl(key, sequence_)) {
RecordTick(options_->statistics, NUMBER_FILTERED_DELETES);
return;
}
mem_->Add(sequence_, kTypeDeletion, key, Slice());
sequence_++;
}
};
} // namespace
Status WriteBatchInternal::InsertInto(const WriteBatch* b,
MemTable* memtable) {
MemTableInserter inserter;
inserter.sequence_ = WriteBatchInternal::Sequence(b);
inserter.mem_ = memtable;
Status WriteBatchInternal::InsertInto(const WriteBatch* b, MemTable* mem,
const Options* opts, DB* db,
const bool filter_deletes) {
MemTableInserter inserter(WriteBatchInternal::Sequence(b), mem, opts, db,
filter_deletes);
return b->Iterate(&inserter);
}