mirror of
https://github.com/facebook/rocksdb.git
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6e9fbeb27c
Summary: We want to keep Env a think layer for better portability. Less platform dependent codes should be moved out of Env. In this patch, I create a wrapper of file readers and writers, and put rate limiting, write buffering, as well as most perf context instrumentation and random kill out of Env. It will make it easier to maintain multiple Env in the future. Test Plan: Run all existing unit tests. Reviewers: anthony, kradhakrishnan, IslamAbdelRahman, yhchiang, igor Reviewed By: igor Subscribers: leveldb, dhruba Differential Revision: https://reviews.facebook.net/D42321
342 lines
11 KiB
C++
342 lines
11 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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#include "table/meta_blocks.h"
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#include <map>
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#include <string>
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#include "db/table_properties_collector.h"
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#include "table/block.h"
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#include "rocksdb/table.h"
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#include "rocksdb/table_properties.h"
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#include "table/format.h"
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#include "table/table_properties_internal.h"
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#include "util/coding.h"
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namespace rocksdb {
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MetaIndexBuilder::MetaIndexBuilder()
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: meta_index_block_(new BlockBuilder(1 /* restart interval */)) {}
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void MetaIndexBuilder::Add(const std::string& key,
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const BlockHandle& handle) {
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std::string handle_encoding;
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handle.EncodeTo(&handle_encoding);
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meta_block_handles_.insert({key, handle_encoding});
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}
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Slice MetaIndexBuilder::Finish() {
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for (const auto& metablock : meta_block_handles_) {
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meta_index_block_->Add(metablock.first, metablock.second);
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}
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return meta_index_block_->Finish();
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}
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PropertyBlockBuilder::PropertyBlockBuilder()
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: properties_block_(new BlockBuilder(1 /* restart interval */)) {}
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void PropertyBlockBuilder::Add(const std::string& name,
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const std::string& val) {
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props_.insert({name, val});
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}
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void PropertyBlockBuilder::Add(const std::string& name, uint64_t val) {
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assert(props_.find(name) == props_.end());
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std::string dst;
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PutVarint64(&dst, val);
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Add(name, dst);
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}
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void PropertyBlockBuilder::Add(
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const UserCollectedProperties& user_collected_properties) {
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for (const auto& prop : user_collected_properties) {
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Add(prop.first, prop.second);
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}
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}
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void PropertyBlockBuilder::AddTableProperty(const TableProperties& props) {
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Add(TablePropertiesNames::kRawKeySize, props.raw_key_size);
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Add(TablePropertiesNames::kRawValueSize, props.raw_value_size);
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Add(TablePropertiesNames::kDataSize, props.data_size);
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Add(TablePropertiesNames::kIndexSize, props.index_size);
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Add(TablePropertiesNames::kNumEntries, props.num_entries);
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Add(TablePropertiesNames::kNumDataBlocks, props.num_data_blocks);
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Add(TablePropertiesNames::kFilterSize, props.filter_size);
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Add(TablePropertiesNames::kFormatVersion, props.format_version);
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Add(TablePropertiesNames::kFixedKeyLen, props.fixed_key_len);
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if (!props.filter_policy_name.empty()) {
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Add(TablePropertiesNames::kFilterPolicy,
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props.filter_policy_name);
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}
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}
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Slice PropertyBlockBuilder::Finish() {
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for (const auto& prop : props_) {
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properties_block_->Add(prop.first, prop.second);
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}
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return properties_block_->Finish();
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}
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void LogPropertiesCollectionError(
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Logger* info_log, const std::string& method, const std::string& name) {
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assert(method == "Add" || method == "Finish");
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std::string msg =
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"Encountered error when calling TablePropertiesCollector::" +
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method + "() with collector name: " + name;
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Log(InfoLogLevel::ERROR_LEVEL, info_log, "%s", msg.c_str());
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}
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bool NotifyCollectTableCollectorsOnAdd(
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const Slice& key, const Slice& value, uint64_t file_size,
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const std::vector<std::unique_ptr<IntTblPropCollector>>& collectors,
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Logger* info_log) {
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bool all_succeeded = true;
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for (auto& collector : collectors) {
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Status s = collector->InternalAdd(key, value, file_size);
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all_succeeded = all_succeeded && s.ok();
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if (!s.ok()) {
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LogPropertiesCollectionError(info_log, "Add" /* method */,
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collector->Name());
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}
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}
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return all_succeeded;
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}
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bool NotifyCollectTableCollectorsOnFinish(
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const std::vector<std::unique_ptr<IntTblPropCollector>>& collectors,
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Logger* info_log, PropertyBlockBuilder* builder) {
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bool all_succeeded = true;
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for (auto& collector : collectors) {
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UserCollectedProperties user_collected_properties;
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Status s = collector->Finish(&user_collected_properties);
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all_succeeded = all_succeeded && s.ok();
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if (!s.ok()) {
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LogPropertiesCollectionError(info_log, "Finish" /* method */,
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collector->Name());
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} else {
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builder->Add(user_collected_properties);
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}
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}
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return all_succeeded;
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}
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Status ReadProperties(const Slice& handle_value, RandomAccessFileReader* file,
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const Footer& footer, Env* env, Logger* logger,
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TableProperties** table_properties) {
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assert(table_properties);
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Slice v = handle_value;
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BlockHandle handle;
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if (!handle.DecodeFrom(&v).ok()) {
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return Status::InvalidArgument("Failed to decode properties block handle");
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}
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BlockContents block_contents;
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ReadOptions read_options;
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read_options.verify_checksums = false;
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Status s;
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s = ReadBlockContents(file, footer, read_options, handle, &block_contents,
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env, false);
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if (!s.ok()) {
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return s;
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}
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Block properties_block(std::move(block_contents));
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std::unique_ptr<Iterator> iter(
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properties_block.NewIterator(BytewiseComparator()));
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auto new_table_properties = new TableProperties();
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// All pre-defined properties of type uint64_t
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std::unordered_map<std::string, uint64_t*> predefined_uint64_properties = {
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{TablePropertiesNames::kDataSize, &new_table_properties->data_size},
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{TablePropertiesNames::kIndexSize, &new_table_properties->index_size},
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{TablePropertiesNames::kFilterSize, &new_table_properties->filter_size},
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{TablePropertiesNames::kRawKeySize, &new_table_properties->raw_key_size},
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{TablePropertiesNames::kRawValueSize,
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&new_table_properties->raw_value_size},
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{TablePropertiesNames::kNumDataBlocks,
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&new_table_properties->num_data_blocks},
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{TablePropertiesNames::kNumEntries, &new_table_properties->num_entries},
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{TablePropertiesNames::kFormatVersion,
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&new_table_properties->format_version},
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{TablePropertiesNames::kFixedKeyLen,
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&new_table_properties->fixed_key_len}, };
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std::string last_key;
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for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
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s = iter->status();
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if (!s.ok()) {
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break;
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}
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auto key = iter->key().ToString();
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// properties block is strictly sorted with no duplicate key.
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assert(last_key.empty() ||
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BytewiseComparator()->Compare(key, last_key) > 0);
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last_key = key;
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auto raw_val = iter->value();
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auto pos = predefined_uint64_properties.find(key);
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if (pos != predefined_uint64_properties.end()) {
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// handle predefined rocksdb properties
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uint64_t val;
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if (!GetVarint64(&raw_val, &val)) {
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// skip malformed value
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auto error_msg =
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"Detect malformed value in properties meta-block:"
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"\tkey: " + key + "\tval: " + raw_val.ToString();
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Log(InfoLogLevel::ERROR_LEVEL, logger, "%s", error_msg.c_str());
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continue;
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}
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*(pos->second) = val;
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} else if (key == TablePropertiesNames::kFilterPolicy) {
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new_table_properties->filter_policy_name = raw_val.ToString();
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} else {
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// handle user-collected properties
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new_table_properties->user_collected_properties.insert(
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{key, raw_val.ToString()});
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}
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}
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if (s.ok()) {
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*table_properties = new_table_properties;
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} else {
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delete new_table_properties;
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}
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return s;
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}
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Status ReadTableProperties(RandomAccessFileReader* file, uint64_t file_size,
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uint64_t table_magic_number, Env* env,
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Logger* info_log, TableProperties** properties) {
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// -- Read metaindex block
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Footer footer;
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auto s = ReadFooterFromFile(file, file_size, &footer, table_magic_number);
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if (!s.ok()) {
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return s;
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}
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auto metaindex_handle = footer.metaindex_handle();
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BlockContents metaindex_contents;
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ReadOptions read_options;
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read_options.verify_checksums = false;
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s = ReadBlockContents(file, footer, read_options, metaindex_handle,
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&metaindex_contents, env, false);
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if (!s.ok()) {
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return s;
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}
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Block metaindex_block(std::move(metaindex_contents));
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std::unique_ptr<Iterator> meta_iter(
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metaindex_block.NewIterator(BytewiseComparator()));
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// -- Read property block
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bool found_properties_block = true;
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s = SeekToPropertiesBlock(meta_iter.get(), &found_properties_block);
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if (!s.ok()) {
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return s;
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}
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TableProperties table_properties;
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if (found_properties_block == true) {
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s = ReadProperties(meta_iter->value(), file, footer, env, info_log,
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properties);
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} else {
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s = Status::NotFound();
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}
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return s;
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}
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Status FindMetaBlock(Iterator* meta_index_iter,
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const std::string& meta_block_name,
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BlockHandle* block_handle) {
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meta_index_iter->Seek(meta_block_name);
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if (meta_index_iter->status().ok() && meta_index_iter->Valid() &&
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meta_index_iter->key() == meta_block_name) {
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Slice v = meta_index_iter->value();
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return block_handle->DecodeFrom(&v);
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} else {
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return Status::Corruption("Cannot find the meta block", meta_block_name);
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}
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}
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Status FindMetaBlock(RandomAccessFileReader* file, uint64_t file_size,
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uint64_t table_magic_number, Env* env,
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const std::string& meta_block_name,
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BlockHandle* block_handle) {
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Footer footer;
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auto s = ReadFooterFromFile(file, file_size, &footer, table_magic_number);
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if (!s.ok()) {
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return s;
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}
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auto metaindex_handle = footer.metaindex_handle();
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BlockContents metaindex_contents;
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ReadOptions read_options;
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read_options.verify_checksums = false;
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s = ReadBlockContents(file, footer, read_options, metaindex_handle,
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&metaindex_contents, env, false);
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if (!s.ok()) {
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return s;
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}
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Block metaindex_block(std::move(metaindex_contents));
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std::unique_ptr<Iterator> meta_iter;
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meta_iter.reset(metaindex_block.NewIterator(BytewiseComparator()));
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return FindMetaBlock(meta_iter.get(), meta_block_name, block_handle);
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}
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Status ReadMetaBlock(RandomAccessFileReader* file, uint64_t file_size,
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uint64_t table_magic_number, Env* env,
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const std::string& meta_block_name,
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BlockContents* contents) {
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Status status;
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Footer footer;
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status = ReadFooterFromFile(file, file_size, &footer, table_magic_number);
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if (!status.ok()) {
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return status;
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}
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// Reading metaindex block
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auto metaindex_handle = footer.metaindex_handle();
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BlockContents metaindex_contents;
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ReadOptions read_options;
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read_options.verify_checksums = false;
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status = ReadBlockContents(file, footer, read_options, metaindex_handle,
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&metaindex_contents, env, false);
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if (!status.ok()) {
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return status;
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}
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// Finding metablock
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Block metaindex_block(std::move(metaindex_contents));
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std::unique_ptr<Iterator> meta_iter;
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meta_iter.reset(metaindex_block.NewIterator(BytewiseComparator()));
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BlockHandle block_handle;
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status = FindMetaBlock(meta_iter.get(), meta_block_name, &block_handle);
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if (!status.ok()) {
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return status;
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}
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// Reading metablock
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return ReadBlockContents(file, footer, read_options, block_handle, contents,
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env, false);
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}
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} // namespace rocksdb
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