rocksdb/util/hash_linklist_rep.h
sdong 8c265c08f1 HashLinkList to log distribution of number of entries aross buckets
Summary: Add two parameters of hash linked list to log distribution of number of entries across all buckets, and a sample row when there are too many entries in one single bucket.

Test Plan: Turn it on in plain_table_db_test and see the logs.

Reviewers: haobo, ljin

Reviewed By: ljin

Subscribers: leveldb, nkg-, dhruba, yhchiang

Differential Revision: https://reviews.facebook.net/D19095
2014-06-17 17:55:36 -07:00

46 lines
1.6 KiB
C++

// Copyright (c) 2013, 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.
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#ifndef ROCKSDB_LITE
#pragma once
#include "rocksdb/slice_transform.h"
#include "rocksdb/memtablerep.h"
namespace rocksdb {
class HashLinkListRepFactory : public MemTableRepFactory {
public:
explicit HashLinkListRepFactory(size_t bucket_count,
size_t huge_page_tlb_size,
int bucket_entries_logging_threshold,
bool if_log_bucket_dist_when_flash)
: bucket_count_(bucket_count),
huge_page_tlb_size_(huge_page_tlb_size),
bucket_entries_logging_threshold_(bucket_entries_logging_threshold),
if_log_bucket_dist_when_flash_(if_log_bucket_dist_when_flash) {}
virtual ~HashLinkListRepFactory() {}
virtual MemTableRep* CreateMemTableRep(
const MemTableRep::KeyComparator& compare, Arena* arena,
const SliceTransform* transform, Logger* logger) override;
virtual const char* Name() const override {
return "HashLinkListRepFactory";
}
private:
const size_t bucket_count_;
const size_t huge_page_tlb_size_;
int bucket_entries_logging_threshold_;
bool if_log_bucket_dist_when_flash_;
};
}
#endif // ROCKSDB_LITE