mirror of https://github.com/facebook/rocksdb.git
71 lines
2.0 KiB
C++
71 lines
2.0 KiB
C++
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// Copyright (c) 2012 Facebook. 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.
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#include "db/version_set.h"
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#include <algorithm>
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#include <stdio.h>
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#include "db/log_reader.h"
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#include "db/log_writer.h"
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#include "util/logging.h"
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namespace leveldb {
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Status VersionSet::ReduceNumberOfLevels(int new_levels, port::Mutex* mu) {
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if(new_levels <= 1) {
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return Status::InvalidArgument(
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"Number of levels needs to be bigger than 1");
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}
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Version* current_version = current_;
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int current_levels = NumberLevels();
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// Make sure there are file only on one level from
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// (new_levels-1) to (current_levels-1)
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int first_nonempty_level = -1;
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int first_nonempty_level_filenum = 0;
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for (int i = new_levels - 1; i < current_levels; i++) {
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int file_num = NumLevelFiles(i);
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if (file_num != 0) {
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if (first_nonempty_level < 0) {
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first_nonempty_level = i;
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first_nonempty_level_filenum = file_num;
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} else {
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char msg[255];
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sprintf(msg, "Found at least two levels containing files: "
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"[%d:%d],[%d:%d].\n",
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first_nonempty_level, first_nonempty_level_filenum, i, file_num);
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return Status::InvalidArgument(msg);
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}
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}
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}
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Status st;
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std::vector<FileMetaData*>* old_files_list = current_version->files_;
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std::vector<FileMetaData*>* new_files_list =
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new std::vector<FileMetaData*>[new_levels];
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for (int i = 0; i < new_levels - 1; i++) {
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new_files_list[i] = old_files_list[i];
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}
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if (first_nonempty_level > 0) {
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new_files_list[new_levels - 1] = old_files_list[first_nonempty_level];
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}
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delete[] current_version->files_;
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current_version->files_ = new_files_list;
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delete[] compact_pointer_;
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delete[] max_file_size_;
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delete[] level_max_bytes_;
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num_levels_ = new_levels;
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compact_pointer_ = new std::string[new_levels];
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Init(new_levels);
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st = LogAndApply(new VersionEdit(new_levels), mu, true);
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return st;
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}
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}
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