Revision f0879e4c396ab8ffd6246afea9f6400c5098bc12 authored by Daniel Black on 22 February 2017, 00:33:54 UTC, committed by Facebook Github Bot on 22 February 2017, 00:39:14 UTC
Summary: Some places autodetected. These are the two places that didn't. closes #1498 Still unsure if the following instances of 4 * 1024 need fixing in: util/io_posix.h include/rocksdb/table.h (appears to be blocksize and different) utilities/persistent_cache/block_cache_tier.cc utilities/persistent_cache/persistent_cache_test.h include/rocksdb/env.h util/env_posix.cc db/column_family.cc Closes https://github.com/facebook/rocksdb/pull/1499 Differential Revision: D4593640 Pulled By: yiwu-arbug fbshipit-source-id: efc48de
1 parent 18eeb7b
two_level_iterator.h
// Copyright (c) 2011-present, 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.
#pragma once
#include "rocksdb/iterator.h"
#include "rocksdb/env.h"
#include "table/iterator_wrapper.h"
namespace rocksdb {
struct ReadOptions;
class InternalKeyComparator;
class Arena;
struct TwoLevelIteratorState {
explicit TwoLevelIteratorState(bool _check_prefix_may_match)
: check_prefix_may_match(_check_prefix_may_match) {}
virtual ~TwoLevelIteratorState() {}
virtual InternalIterator* NewSecondaryIterator(const Slice& handle) = 0;
virtual bool PrefixMayMatch(const Slice& internal_key) = 0;
// If call PrefixMayMatch()
bool check_prefix_may_match;
};
// Return a new two level iterator. A two-level iterator contains an
// index iterator whose values point to a sequence of blocks where
// each block is itself a sequence of key,value pairs. The returned
// two-level iterator yields the concatenation of all key/value pairs
// in the sequence of blocks. Takes ownership of "index_iter" and
// will delete it when no longer needed.
//
// Uses a supplied function to convert an index_iter value into
// an iterator over the contents of the corresponding block.
// arena: If not null, the arena is used to allocate the Iterator.
// When destroying the iterator, the destructor will destroy
// all the states but those allocated in arena.
// need_free_iter_and_state: free `state` and `first_level_iter` if
// true. Otherwise, just call destructor.
extern InternalIterator* NewTwoLevelIterator(
TwoLevelIteratorState* state, InternalIterator* first_level_iter,
Arena* arena = nullptr, bool need_free_iter_and_state = true);
} // namespace rocksdb
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