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36a5f8ed7f
- Replace raw slice comparison with a call to user comparator.
Added test for custom comparators.
- Fix end of namespace comments.
- Fixed bug in picking inputs for a level-0 compaction.
When finding overlapping files, the covered range may expand
as files are added to the input set. We now correctly expand
the range when this happens instead of continuing to use the
old range. For example, suppose L0 contains files with the
following ranges:
F1: a .. d
F2: c .. g
F3: f .. j
and the initial compaction target is F3. We used to search
for range f..j which yielded {F2,F3}. However we now expand
the range as soon as another file is added. In this case,
when F2 is added, we expand the range to c..j and restart the
search. That picks up file F1 as well.
This change fixes a bug related to deleted keys showing up
incorrectly after a compaction as described in Issue 44.
(Sync with upstream @25072954)
71 lines
2.4 KiB
C++
71 lines
2.4 KiB
C++
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#ifndef STORAGE_LEVELDB_INCLUDE_TABLE_H_
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#define STORAGE_LEVELDB_INCLUDE_TABLE_H_
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#include <stdint.h>
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#include "leveldb/iterator.h"
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namespace leveldb {
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class Block;
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class BlockHandle;
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struct Options;
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class RandomAccessFile;
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struct ReadOptions;
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// A Table is a sorted map from strings to strings. Tables are
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// immutable and persistent. A Table may be safely accessed from
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// multiple threads without external synchronization.
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class Table {
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public:
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// Attempt to open the table that is stored in bytes [0..file_size)
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// of "file", and read the metadata entries necessary to allow
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// retrieving data from the table.
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//
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// If successful, returns ok and sets "*table" to the newly opened
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// table. The client should delete "*table" when no longer needed.
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// If there was an error while initializing the table, sets "*table"
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// to NULL and returns a non-ok status. Does not take ownership of
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// "*source", but the client must ensure that "source" remains live
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// for the duration of the returned table's lifetime.
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//
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// *file must remain live while this Table is in use.
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static Status Open(const Options& options,
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RandomAccessFile* file,
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uint64_t file_size,
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Table** table);
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~Table();
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// Returns a new iterator over the table contents.
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// The result of NewIterator() is initially invalid (caller must
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// call one of the Seek methods on the iterator before using it).
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Iterator* NewIterator(const ReadOptions&) const;
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// Given a key, return an approximate byte offset in the file where
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// the data for that key begins (or would begin if the key were
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// present in the file). The returned value is in terms of file
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// bytes, and so includes effects like compression of the underlying data.
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// E.g., the approximate offset of the last key in the table will
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// be close to the file length.
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uint64_t ApproximateOffsetOf(const Slice& key) const;
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private:
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struct Rep;
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Rep* rep_;
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explicit Table(Rep* rep) { rep_ = rep; }
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static Iterator* BlockReader(void*, const ReadOptions&, const Slice&);
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// No copying allowed
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Table(const Table&);
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void operator=(const Table&);
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};
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} // namespace leveldb
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#endif // STORAGE_LEVELDB_INCLUDE_TABLE_H_
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