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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)
49 lines
1.3 KiB
C++
49 lines
1.3 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_DB_LOG_WRITER_H_
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#define STORAGE_LEVELDB_DB_LOG_WRITER_H_
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#include <stdint.h>
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#include "db/log_format.h"
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#include "leveldb/slice.h"
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#include "leveldb/status.h"
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namespace leveldb {
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class WritableFile;
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namespace log {
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class Writer {
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public:
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// Create a writer that will append data to "*dest".
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// "*dest" must be initially empty.
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// "*dest" must remain live while this Writer is in use.
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explicit Writer(WritableFile* dest);
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~Writer();
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Status AddRecord(const Slice& slice);
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private:
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WritableFile* dest_;
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int block_offset_; // Current offset in block
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// crc32c values for all supported record types. These are
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// pre-computed to reduce the overhead of computing the crc of the
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// record type stored in the header.
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uint32_t type_crc_[kMaxRecordType + 1];
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Status EmitPhysicalRecord(RecordType type, const char* ptr, size_t length);
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// No copying allowed
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Writer(const Writer&);
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void operator=(const Writer&);
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};
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} // namespace log
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} // namespace leveldb
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#endif // STORAGE_LEVELDB_DB_LOG_WRITER_H_
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