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rocksdb/table/table_properties.cc
Peter Dillinger 04db764831 Embed original file number in SST table properties (#8686) 
Summary:
I very recently realized that with https://github.com/facebook/rocksdb/issues/8669 we cannot later add
file numbers to external SST files (so that more can share db session
ids for better uniqueness properties), because of forward compatibility.
We would have a version of RocksDB that assumes session IDs are unique
on external SST files and therefore can't really break that invariant in
future files.

This change adds a table property for "orig_file_number" which is
populated by normal SST files and also external SST files generated by
SstFileWriter. SstFileWriter now keeps a db_session_id for life of the
object and increments its own file numbers for embedding in table
properties. (They are arguably "fake" file numbers because these numbers
and not embedded in the file name.)

While updating block_based_table_builder, I removed several unnecessary
fields from Rep, because following the pattern would have created
another unnecessary field.

This change also updates block_based_table_reader to use this new
property when available, which means that for newer SST files, we can
determine the stable/original <db_session_id,file_number> unique
identifier using just the file contents, not the file name. (It's a bit
complicated; detailed comments in block_based_table_reader.)

Also added DB host id to properties listing by sst_dump, which could be
useful in debugging.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8686

Test Plan: majorly overhauled StableCacheKeys test for this change

Reviewed By: zhichao-cao

Differential Revision: D30457742

Pulled By: pdillinger

fbshipit-source-id: 2e5ae7dddeb94fb9d8eac8a928486aed8b8cd445
2021-08-20 20:40:48 -07:00

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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#include "rocksdb/table_properties.h"
#include "port/port.h"
#include "rocksdb/env.h"
#include "rocksdb/iterator.h"
#include "table/block_based/block.h"
#include "table/internal_iterator.h"
#include "table/table_properties_internal.h"
#include "util/string_util.h"
namespace ROCKSDB_NAMESPACE {
const uint32_t TablePropertiesCollectorFactory::Context::kUnknownColumnFamily =
port::kMaxInt32;
namespace {
void AppendProperty(
std::string& props,
const std::string& key,
const std::string& value,
const std::string& prop_delim,
const std::string& kv_delim) {
props.append(key);
props.append(kv_delim);
props.append(value);
props.append(prop_delim);
}
template <class TValue>
void AppendProperty(
std::string& props,
const std::string& key,
const TValue& value,
const std::string& prop_delim,
const std::string& kv_delim) {
AppendProperty(
props, key, ToString(value), prop_delim, kv_delim
);
}
// Seek to the specified meta block.
// Return true if it successfully seeks to that block.
Status SeekToMetaBlock(InternalIterator* meta_iter,
const std::string& block_name, bool* is_found,
BlockHandle* block_handle = nullptr) {
if (block_handle != nullptr) {
*block_handle = BlockHandle::NullBlockHandle();
}
*is_found = true;
meta_iter->Seek(block_name);
if (meta_iter->status().ok()) {
if (meta_iter->Valid() && meta_iter->key() == block_name) {
*is_found = true;
if (block_handle) {
Slice v = meta_iter->value();
return block_handle->DecodeFrom(&v);
}
} else {
*is_found = false;
return Status::OK();
}
}
return meta_iter->status();
}
}
std::string TableProperties::ToString(
const std::string& prop_delim,
const std::string& kv_delim) const {
std::string result;
result.reserve(1024);
// Basic Info
AppendProperty(result, "# data blocks", num_data_blocks, prop_delim,
kv_delim);
AppendProperty(result, "# entries", num_entries, prop_delim, kv_delim);
AppendProperty(result, "# deletions", num_deletions, prop_delim, kv_delim);
AppendProperty(result, "# merge operands", num_merge_operands, prop_delim,
kv_delim);
AppendProperty(result, "# range deletions", num_range_deletions, prop_delim,
kv_delim);
AppendProperty(result, "raw key size", raw_key_size, prop_delim, kv_delim);
AppendProperty(result, "raw average key size",
num_entries != 0 ? 1.0 * raw_key_size / num_entries : 0.0,
prop_delim, kv_delim);
AppendProperty(result, "raw value size", raw_value_size, prop_delim,
kv_delim);
AppendProperty(result, "raw average value size",
num_entries != 0 ? 1.0 * raw_value_size / num_entries : 0.0,
prop_delim, kv_delim);
AppendProperty(result, "data block size", data_size, prop_delim, kv_delim);
char index_block_size_str[80];
snprintf(index_block_size_str, sizeof(index_block_size_str),
"index block size (user-key? %d, delta-value? %d)",
static_cast<int>(index_key_is_user_key),
static_cast<int>(index_value_is_delta_encoded));
AppendProperty(result, index_block_size_str, index_size, prop_delim,
kv_delim);
if (index_partitions != 0) {
AppendProperty(result, "# index partitions", index_partitions, prop_delim,
kv_delim);
AppendProperty(result, "top-level index size", top_level_index_size, prop_delim,
kv_delim);
}
AppendProperty(result, "filter block size", filter_size, prop_delim,
kv_delim);
AppendProperty(result, "# entries for filter", num_filter_entries, prop_delim,
kv_delim);
AppendProperty(result, "(estimated) table size",
data_size + index_size + filter_size, prop_delim, kv_delim);
AppendProperty(
result, "filter policy name",
filter_policy_name.empty() ? std::string("N/A") : filter_policy_name,
prop_delim, kv_delim);
AppendProperty(result, "prefix extractor name",
prefix_extractor_name.empty() ? std::string("N/A")
: prefix_extractor_name,
prop_delim, kv_delim);
AppendProperty(result, "column family ID",
column_family_id ==
ROCKSDB_NAMESPACE::TablePropertiesCollectorFactory::
Context::kUnknownColumnFamily
? std::string("N/A")
: ROCKSDB_NAMESPACE::ToString(column_family_id),
prop_delim, kv_delim);
AppendProperty(
result, "column family name",
column_family_name.empty() ? std::string("N/A") : column_family_name,
prop_delim, kv_delim);
AppendProperty(result, "comparator name",
comparator_name.empty() ? std::string("N/A") : comparator_name,
prop_delim, kv_delim);
AppendProperty(
result, "merge operator name",
merge_operator_name.empty() ? std::string("N/A") : merge_operator_name,
prop_delim, kv_delim);
AppendProperty(result, "property collectors names",
property_collectors_names.empty() ? std::string("N/A")
: property_collectors_names,
prop_delim, kv_delim);
AppendProperty(
result, "SST file compression algo",
compression_name.empty() ? std::string("N/A") : compression_name,
prop_delim, kv_delim);
AppendProperty(
result, "SST file compression options",
compression_options.empty() ? std::string("N/A") : compression_options,
prop_delim, kv_delim);
AppendProperty(result, "creation time", creation_time, prop_delim, kv_delim);
AppendProperty(result, "time stamp of earliest key", oldest_key_time,
prop_delim, kv_delim);
AppendProperty(result, "file creation time", file_creation_time, prop_delim,
kv_delim);
AppendProperty(result, "slow compression estimated data size",
slow_compression_estimated_data_size, prop_delim, kv_delim);
AppendProperty(result, "fast compression estimated data size",
fast_compression_estimated_data_size, prop_delim, kv_delim);
// DB identity and DB session ID
AppendProperty(result, "DB identity", db_id, prop_delim, kv_delim);
AppendProperty(result, "DB session identity", db_session_id, prop_delim,
kv_delim);
AppendProperty(result, "DB host id", db_host_id, prop_delim, kv_delim);
AppendProperty(result, "original file number", orig_file_number, prop_delim,
kv_delim);
return result;
}
void TableProperties::Add(const TableProperties& tp) {
data_size += tp.data_size;
index_size += tp.index_size;
index_partitions += tp.index_partitions;
top_level_index_size += tp.top_level_index_size;
index_key_is_user_key += tp.index_key_is_user_key;
index_value_is_delta_encoded += tp.index_value_is_delta_encoded;
filter_size += tp.filter_size;
raw_key_size += tp.raw_key_size;
raw_value_size += tp.raw_value_size;
num_data_blocks += tp.num_data_blocks;
num_entries += tp.num_entries;
num_filter_entries += tp.num_filter_entries;
num_deletions += tp.num_deletions;
num_merge_operands += tp.num_merge_operands;
num_range_deletions += tp.num_range_deletions;
slow_compression_estimated_data_size +=
tp.slow_compression_estimated_data_size;
fast_compression_estimated_data_size +=
tp.fast_compression_estimated_data_size;
}
std::map<std::string, uint64_t>
TableProperties::GetAggregatablePropertiesAsMap() const {
std::map<std::string, uint64_t> rv;
rv["data_size"] = data_size;
rv["index_size"] = index_size;
rv["index_partitions"] = index_partitions;
rv["top_level_index_size"] = top_level_index_size;
rv["filter_size"] = filter_size;
rv["raw_key_size"] = raw_key_size;
rv["raw_value_size"] = raw_value_size;
rv["num_data_blocks"] = num_data_blocks;
rv["num_entries"] = num_entries;
rv["num_filter_entries"] = num_filter_entries;
rv["num_deletions"] = num_deletions;
rv["num_merge_operands"] = num_merge_operands;
rv["num_range_deletions"] = num_range_deletions;
rv["slow_compression_estimated_data_size"] =
slow_compression_estimated_data_size;
rv["fast_compression_estimated_data_size"] =
fast_compression_estimated_data_size;
return rv;
}
const std::string TablePropertiesNames::kDbId = "rocksdb.creating.db.identity";
const std::string TablePropertiesNames::kDbSessionId =
"rocksdb.creating.session.identity";
const std::string TablePropertiesNames::kDbHostId =
"rocksdb.creating.host.identity";
const std::string TablePropertiesNames::kOriginalFileNumber =
"rocksdb.original.file.number";
const std::string TablePropertiesNames::kDataSize =
"rocksdb.data.size";
const std::string TablePropertiesNames::kIndexSize =
"rocksdb.index.size";
const std::string TablePropertiesNames::kIndexPartitions =
"rocksdb.index.partitions";
const std::string TablePropertiesNames::kTopLevelIndexSize =
"rocksdb.top-level.index.size";
const std::string TablePropertiesNames::kIndexKeyIsUserKey =
"rocksdb.index.key.is.user.key";
const std::string TablePropertiesNames::kIndexValueIsDeltaEncoded =
"rocksdb.index.value.is.delta.encoded";
const std::string TablePropertiesNames::kFilterSize =
"rocksdb.filter.size";
const std::string TablePropertiesNames::kRawKeySize =
"rocksdb.raw.key.size";
const std::string TablePropertiesNames::kRawValueSize =
"rocksdb.raw.value.size";
const std::string TablePropertiesNames::kNumDataBlocks =
"rocksdb.num.data.blocks";
const std::string TablePropertiesNames::kNumEntries =
"rocksdb.num.entries";
const std::string TablePropertiesNames::kNumFilterEntries =
"rocksdb.num.filter_entries";
const std::string TablePropertiesNames::kDeletedKeys = "rocksdb.deleted.keys";
const std::string TablePropertiesNames::kMergeOperands =
"rocksdb.merge.operands";
const std::string TablePropertiesNames::kNumRangeDeletions =
"rocksdb.num.range-deletions";
const std::string TablePropertiesNames::kFilterPolicy =
"rocksdb.filter.policy";
const std::string TablePropertiesNames::kFormatVersion =
"rocksdb.format.version";
const std::string TablePropertiesNames::kFixedKeyLen =
"rocksdb.fixed.key.length";
const std::string TablePropertiesNames::kColumnFamilyId =
"rocksdb.column.family.id";
const std::string TablePropertiesNames::kColumnFamilyName =
"rocksdb.column.family.name";
const std::string TablePropertiesNames::kComparator = "rocksdb.comparator";
const std::string TablePropertiesNames::kMergeOperator =
"rocksdb.merge.operator";
const std::string TablePropertiesNames::kPrefixExtractorName =
"rocksdb.prefix.extractor.name";
const std::string TablePropertiesNames::kPropertyCollectors =
"rocksdb.property.collectors";
const std::string TablePropertiesNames::kCompression = "rocksdb.compression";
const std::string TablePropertiesNames::kCompressionOptions =
"rocksdb.compression_options";
const std::string TablePropertiesNames::kCreationTime = "rocksdb.creation.time";
const std::string TablePropertiesNames::kOldestKeyTime =
"rocksdb.oldest.key.time";
const std::string TablePropertiesNames::kFileCreationTime =
"rocksdb.file.creation.time";
const std::string TablePropertiesNames::kSlowCompressionEstimatedDataSize =
"rocksdb.sample_for_compression.slow.data.size";
const std::string TablePropertiesNames::kFastCompressionEstimatedDataSize =
"rocksdb.sample_for_compression.fast.data.size";
extern const std::string kPropertiesBlock = "rocksdb.properties";
// Old property block name for backward compatibility
extern const std::string kPropertiesBlockOldName = "rocksdb.stats";
extern const std::string kCompressionDictBlock = "rocksdb.compression_dict";
extern const std::string kRangeDelBlock = "rocksdb.range_del";
// Seek to the properties block.
// Return true if it successfully seeks to the properties block.
Status SeekToPropertiesBlock(InternalIterator* meta_iter, bool* is_found) {
Status status = SeekToMetaBlock(meta_iter, kPropertiesBlock, is_found);
if (!*is_found && status.ok()) {
status = SeekToMetaBlock(meta_iter, kPropertiesBlockOldName, is_found);
}
return status;
}
// Seek to the compression dictionary block.
// Return true if it successfully seeks to that block.
Status SeekToCompressionDictBlock(InternalIterator* meta_iter, bool* is_found,
BlockHandle* block_handle) {
return SeekToMetaBlock(meta_iter, kCompressionDictBlock, is_found, block_handle);
}
Status SeekToRangeDelBlock(InternalIterator* meta_iter, bool* is_found,
BlockHandle* block_handle = nullptr) {
return SeekToMetaBlock(meta_iter, kRangeDelBlock, is_found, block_handle);
}
} // namespace ROCKSDB_NAMESPACE
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