6d6fb70960
Summary: The only thing we do with compaction pointers is set them to some values, we never actually read them. I don't know what we used them for, but it doesn't look like we use them anymore. Test Plan: make check Reviewers: dhruba, haobo, kailiu, sdong Reviewed By: kailiu CC: leveldb Differential Revision: https://reviews.facebook.net/D15225
78 lines
2.3 KiB
C++
78 lines
2.3 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) 2012 Facebook. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
#include "db/version_set.h"
|
|
|
|
#include <algorithm>
|
|
#include <stdio.h>
|
|
#include "db/log_reader.h"
|
|
#include "db/log_writer.h"
|
|
#include "util/logging.h"
|
|
|
|
namespace rocksdb {
|
|
|
|
Status VersionSet::ReduceNumberOfLevels(int new_levels, port::Mutex* mu) {
|
|
|
|
if(new_levels <= 1) {
|
|
return Status::InvalidArgument(
|
|
"Number of levels needs to be bigger than 1");
|
|
}
|
|
|
|
Version* current_version = current_;
|
|
int current_levels = current_version->NumberLevels();
|
|
|
|
if (current_levels <= new_levels) {
|
|
return Status::OK();
|
|
}
|
|
|
|
// Make sure there are file only on one level from
|
|
// (new_levels-1) to (current_levels-1)
|
|
int first_nonempty_level = -1;
|
|
int first_nonempty_level_filenum = 0;
|
|
for (int i = new_levels - 1; i < current_levels; i++) {
|
|
int file_num = current_version->NumLevelFiles(i);
|
|
if (file_num != 0) {
|
|
if (first_nonempty_level < 0) {
|
|
first_nonempty_level = i;
|
|
first_nonempty_level_filenum = file_num;
|
|
} else {
|
|
char msg[255];
|
|
sprintf(msg, "Found at least two levels containing files: "
|
|
"[%d:%d],[%d:%d].\n",
|
|
first_nonempty_level, first_nonempty_level_filenum, i, file_num);
|
|
return Status::InvalidArgument(msg);
|
|
}
|
|
}
|
|
}
|
|
|
|
Status st;
|
|
std::vector<FileMetaData*>* old_files_list = current_version->files_;
|
|
std::vector<FileMetaData*>* new_files_list =
|
|
new std::vector<FileMetaData*>[new_levels];
|
|
for (int i = 0; i < new_levels - 1; i++) {
|
|
new_files_list[i] = old_files_list[i];
|
|
}
|
|
|
|
if (first_nonempty_level > 0) {
|
|
new_files_list[new_levels - 1] = old_files_list[first_nonempty_level];
|
|
}
|
|
|
|
delete[] current_version->files_;
|
|
current_version->files_ = new_files_list;
|
|
current_version->num_levels_ = new_levels;
|
|
|
|
num_levels_ = new_levels;
|
|
compaction_picker_->ReduceNumberOfLevels(new_levels);
|
|
VersionEdit ve;
|
|
st = LogAndApply(&ve, mu, true);
|
|
return st;
|
|
}
|
|
|
|
}
|