25'ten fazla konu seçemezsiniz
Konular bir harf veya rakamla başlamalı, kısa çizgiler ('-') içerebilir ve en fazla 35 karakter uzunluğunda olabilir.
102 satır
2.8 KiB
102 satır
2.8 KiB
// 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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#include "db/builder.h"
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#include "db/dbformat.h"
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#include "db/filename.h"
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#include "db/table_cache.h"
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#include "db/version_edit.h"
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#include "leveldb/db.h"
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#include "leveldb/env.h"
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#include "leveldb/iterator.h"
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namespace leveldb {
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Status BuildTable(const std::string& dbname, Env* env, const Options& options,
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TableCache* table_cache, Iterator* iter, FileMetaData* meta) {
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Status s;
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meta->file_size = 0;
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iter->SeekToFirst();
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std::string fname = TableFileName(dbname, meta->number);
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if (iter->Valid()) {
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WritableFile* file;
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s = env->NewWritableFile(fname, &file);
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if (!s.ok()) {
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return s;
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}
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time_t nowTime;
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time(&nowTime);
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assert(nowTime > 0);
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TableBuilder* builder = new TableBuilder(options, file);
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meta->smallest.DecodeFrom(iter->key());
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Slice key;
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ParsedInternalKey parsed;
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meta->smallest_deadtime = UINT64_MAX;
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meta->largest_deadtime = 0;
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for (; iter->Valid(); iter->Next()) {
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key = iter->key();
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builder->Add(key, iter->value());
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//在构建sstable文件的时候，记录当前文件的生存期最大和最小值,
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//这里要注意internalkey和metadata中对于没有生存期的表示的转换
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ParseInternalKey(key,&parsed);
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if(parsed.deadTime == 0) parsed.deadTime = UINT64_MAX;
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if(parsed.deadTime < nowTime) {
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static int count = 0;
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if(count % 1000 == 0) {
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std::cout<<"count "<<count++<<" drop dead in L0: "<<parsed.user_key.ToString()<<" "<<parsed.deadTime<<std::endl;
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}
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continue;
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}
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meta->smallest_deadtime = std::min(meta->smallest_deadtime,parsed.deadTime);
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meta->largest_deadtime = std::max(meta->largest_deadtime,parsed.deadTime);
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}
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if (!key.empty()) {
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meta->largest.DecodeFrom(key);
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}
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// Finish and check for builder errors
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s = builder->Finish();
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if (s.ok()) {
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meta->file_size = builder->FileSize();
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assert(meta->file_size > 0);
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}
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delete builder;
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// Finish and check for file errors
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if (s.ok()) {
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s = file->Sync();
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}
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if (s.ok()) {
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s = file->Close();
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}
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delete file;
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file = nullptr;
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if (s.ok()) {
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// Verify that the table is usable
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Iterator* it = table_cache->NewIterator(ReadOptions(), meta->number,
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meta->file_size);
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s = it->status();
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delete it;
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}
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}
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// Check for input iterator errors
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if (!iter->status().ok()) {
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s = iter->status();
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}
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if (s.ok() && meta->file_size > 0) {
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// Keep it
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} else {
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env->RemoveFile(fname);
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}
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return s;
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}
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} // namespace leveldb
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