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rocksdb/tools/sst_dump_tool.cc
Mike Kolupaev 397ab11152 Improve Status message for block checksum mismatches 
Summary:
We've got some DBs where iterators return Status with message "Corruption: block checksum mismatch" all the time. That's not very informative. It would be much easier to investigate if the error message contained the file name - then we would know e.g. how old the corrupted file is, which would be very useful for finding the root cause. This PR adds file name, offset and other stuff to some block corruption-related status messages.

It doesn't improve all the error messages, just a few that were easy to improve. I'm mostly interested in "block checksum mismatch" and "Bad table magic number" since they're the only corruption errors that I've ever seen in the wild.
Closes https://github.com/facebook/rocksdb/pull/2507

Differential Revision: D5345702

Pulled By: al13n321

fbshipit-source-id: fc8023d43f1935ad927cef1b9c55481ab3cb1339
2017-06-28 21:27:01 -07:00

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22 KiB
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// Copyright (c) 2011-present, 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.
// This source code is also licensed under the GPLv2 license found in the
// COPYING file in the root directory of this source tree.
//
#ifndef ROCKSDB_LITE
#include "tools/sst_dump_tool_imp.h"
#ifndef __STDC_FORMAT_MACROS
#define __STDC_FORMAT_MACROS
#endif
#include <inttypes.h>
#include <iostream>
#include <map>
#include <sstream>
#include <vector>
#include "db/memtable.h"
#include "db/write_batch_internal.h"
#include "options/cf_options.h"
#include "rocksdb/db.h"
#include "rocksdb/env.h"
#include "rocksdb/iterator.h"
#include "rocksdb/slice_transform.h"
#include "rocksdb/status.h"
#include "rocksdb/table_properties.h"
#include "rocksdb/utilities/ldb_cmd.h"
#include "table/block.h"
#include "table/block_based_table_builder.h"
#include "table/block_based_table_factory.h"
#include "table/block_builder.h"
#include "table/format.h"
#include "table/meta_blocks.h"
#include "table/plain_table_factory.h"
#include "table/table_reader.h"
#include "util/compression.h"
#include "util/random.h"
#include "port/port.h"
namespace rocksdb {
using std::dynamic_pointer_cast;
SstFileReader::SstFileReader(const std::string& file_path,
bool verify_checksum,
bool output_hex)
:file_name_(file_path), read_num_(0), verify_checksum_(verify_checksum),
output_hex_(output_hex), ioptions_(options_),
internal_comparator_(BytewiseComparator()) {
fprintf(stdout, "Process %s\n", file_path.c_str());
init_result_ = GetTableReader(file_name_);
}
extern const uint64_t kBlockBasedTableMagicNumber;
extern const uint64_t kLegacyBlockBasedTableMagicNumber;
extern const uint64_t kPlainTableMagicNumber;
extern const uint64_t kLegacyPlainTableMagicNumber;
const char* testFileName = "test_file_name";
Status SstFileReader::GetTableReader(const std::string& file_path) {
// Warning about 'magic_number' being uninitialized shows up only in UBsan
// builds. Though access is guarded by 's.ok()' checks, fix the issue to
// avoid any warnings.
uint64_t magic_number = Footer::kInvalidTableMagicNumber;
// read table magic number
Footer footer;
unique_ptr<RandomAccessFile> file;
uint64_t file_size;
Status s = options_.env->NewRandomAccessFile(file_path, &file, soptions_);
if (s.ok()) {
s = options_.env->GetFileSize(file_path, &file_size);
}
file_.reset(new RandomAccessFileReader(std::move(file), file_path));
if (s.ok()) {
s = ReadFooterFromFile(file_.get(), file_size, &footer);
}
if (s.ok()) {
magic_number = footer.table_magic_number();
}
if (s.ok()) {
if (magic_number == kPlainTableMagicNumber ||
magic_number == kLegacyPlainTableMagicNumber) {
soptions_.use_mmap_reads = true;
options_.env->NewRandomAccessFile(file_path, &file, soptions_);
file_.reset(new RandomAccessFileReader(std::move(file), file_path));
}
options_.comparator = &internal_comparator_;
// For old sst format, ReadTableProperties might fail but file can be read
if (ReadTableProperties(magic_number, file_.get(), file_size).ok()) {
SetTableOptionsByMagicNumber(magic_number);
} else {
SetOldTableOptions();
}
}
if (s.ok()) {
s = NewTableReader(ioptions_, soptions_, internal_comparator_, file_size,
&table_reader_);
}
return s;
}
Status SstFileReader::NewTableReader(
const ImmutableCFOptions& ioptions, const EnvOptions& soptions,
const InternalKeyComparator& internal_comparator, uint64_t file_size,
unique_ptr<TableReader>* table_reader) {
// We need to turn off pre-fetching of index and filter nodes for
// BlockBasedTable
shared_ptr<BlockBasedTableFactory> block_table_factory =
dynamic_pointer_cast<BlockBasedTableFactory>(options_.table_factory);
if (block_table_factory) {
return block_table_factory->NewTableReader(
TableReaderOptions(ioptions_, soptions_, internal_comparator_,
/*skip_filters=*/false),
std::move(file_), file_size, &table_reader_, /*enable_prefetch=*/false);
}
assert(!block_table_factory);
// For all other factory implementation
return options_.table_factory->NewTableReader(
TableReaderOptions(ioptions_, soptions_, internal_comparator_),
std::move(file_), file_size, &table_reader_);
}
Status SstFileReader::DumpTable(const std::string& out_filename) {
unique_ptr<WritableFile> out_file;
Env* env = Env::Default();
env->NewWritableFile(out_filename, &out_file, soptions_);
Status s = table_reader_->DumpTable(out_file.get());
out_file->Close();
return s;
}
uint64_t SstFileReader::CalculateCompressedTableSize(
const TableBuilderOptions& tb_options, size_t block_size) {
unique_ptr<WritableFile> out_file;
unique_ptr<Env> env(NewMemEnv(Env::Default()));
env->NewWritableFile(testFileName, &out_file, soptions_);
unique_ptr<WritableFileWriter> dest_writer;
dest_writer.reset(new WritableFileWriter(std::move(out_file), soptions_));
BlockBasedTableOptions table_options;
table_options.block_size = block_size;
BlockBasedTableFactory block_based_tf(table_options);
unique_ptr<TableBuilder> table_builder;
table_builder.reset(block_based_tf.NewTableBuilder(
tb_options,
TablePropertiesCollectorFactory::Context::kUnknownColumnFamily,
dest_writer.get()));
unique_ptr<InternalIterator> iter(table_reader_->NewIterator(ReadOptions()));
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
if (!iter->status().ok()) {
fputs(iter->status().ToString().c_str(), stderr);
exit(1);
}
table_builder->Add(iter->key(), iter->value());
}
Status s = table_builder->Finish();
if (!s.ok()) {
fputs(s.ToString().c_str(), stderr);
exit(1);
}
uint64_t size = table_builder->FileSize();
env->DeleteFile(testFileName);
return size;
}
int SstFileReader::ShowAllCompressionSizes(size_t block_size) {
ReadOptions read_options;
Options opts;
const ImmutableCFOptions imoptions(opts);
rocksdb::InternalKeyComparator ikc(opts.comparator);
std::vector<std::unique_ptr<IntTblPropCollectorFactory> >
block_based_table_factories;
fprintf(stdout, "Block Size: %" ROCKSDB_PRIszt "\n", block_size);
std::pair<CompressionType, const char*> compressions[] = {
{CompressionType::kNoCompression, "kNoCompression"},
{CompressionType::kSnappyCompression, "kSnappyCompression"},
{CompressionType::kZlibCompression, "kZlibCompression"},
{CompressionType::kBZip2Compression, "kBZip2Compression"},
{CompressionType::kLZ4Compression, "kLZ4Compression"},
{CompressionType::kLZ4HCCompression, "kLZ4HCCompression"},
{CompressionType::kXpressCompression, "kXpressCompression"},
{CompressionType::kZSTD, "kZSTD"}};
for (auto& i : compressions) {
if (CompressionTypeSupported(i.first)) {
CompressionOptions compress_opt;
std::string column_family_name;
int unknown_level = -1;
TableBuilderOptions tb_opts(imoptions, ikc, &block_based_table_factories,
i.first, compress_opt,
nullptr /* compression_dict */,
false /* skip_filters */, column_family_name,
unknown_level);
uint64_t file_size = CalculateCompressedTableSize(tb_opts, block_size);
fprintf(stdout, "Compression: %s", i.second);
fprintf(stdout, " Size: %" PRIu64 "\n", file_size);
} else {
fprintf(stdout, "Unsupported compression type: %s.\n", i.second);
}
}
return 0;
}
Status SstFileReader::ReadTableProperties(uint64_t table_magic_number,
RandomAccessFileReader* file,
uint64_t file_size) {
TableProperties* table_properties = nullptr;
Status s = rocksdb::ReadTableProperties(file, file_size, table_magic_number,
ioptions_, &table_properties);
if (s.ok()) {
table_properties_.reset(table_properties);
} else {
fprintf(stdout, "Not able to read table properties\n");
}
return s;
}
Status SstFileReader::SetTableOptionsByMagicNumber(
uint64_t table_magic_number) {
assert(table_properties_);
if (table_magic_number == kBlockBasedTableMagicNumber ||
table_magic_number == kLegacyBlockBasedTableMagicNumber) {
options_.table_factory = std::make_shared<BlockBasedTableFactory>();
fprintf(stdout, "Sst file format: block-based\n");
auto& props = table_properties_->user_collected_properties;
auto pos = props.find(BlockBasedTablePropertyNames::kIndexType);
if (pos != props.end()) {
auto index_type_on_file = static_cast<BlockBasedTableOptions::IndexType>(
DecodeFixed32(pos->second.c_str()));
if (index_type_on_file ==
BlockBasedTableOptions::IndexType::kHashSearch) {
options_.prefix_extractor.reset(NewNoopTransform());
}
}
} else if (table_magic_number == kPlainTableMagicNumber ||
table_magic_number == kLegacyPlainTableMagicNumber) {
options_.allow_mmap_reads = true;
PlainTableOptions plain_table_options;
plain_table_options.user_key_len = kPlainTableVariableLength;
plain_table_options.bloom_bits_per_key = 0;
plain_table_options.hash_table_ratio = 0;
plain_table_options.index_sparseness = 1;
plain_table_options.huge_page_tlb_size = 0;
plain_table_options.encoding_type = kPlain;
plain_table_options.full_scan_mode = true;
options_.table_factory.reset(NewPlainTableFactory(plain_table_options));
fprintf(stdout, "Sst file format: plain table\n");
} else {
char error_msg_buffer[80];
snprintf(error_msg_buffer, sizeof(error_msg_buffer) - 1,
"Unsupported table magic number --- %lx",
(long)table_magic_number);
return Status::InvalidArgument(error_msg_buffer);
}
return Status::OK();
}
Status SstFileReader::SetOldTableOptions() {
assert(table_properties_ == nullptr);
options_.table_factory = std::make_shared<BlockBasedTableFactory>();
fprintf(stdout, "Sst file format: block-based(old version)\n");
return Status::OK();
}
Status SstFileReader::ReadSequential(bool print_kv, uint64_t read_num,
bool has_from, const std::string& from_key,
bool has_to, const std::string& to_key,
bool use_from_as_prefix) {
if (!table_reader_) {
return init_result_;
}
InternalIterator* iter =
table_reader_->NewIterator(ReadOptions(verify_checksum_, false));
uint64_t i = 0;
if (has_from) {
InternalKey ikey;
ikey.SetMaxPossibleForUserKey(from_key);
iter->Seek(ikey.Encode());
} else {
iter->SeekToFirst();
}
for (; iter->Valid(); iter->Next()) {
Slice key = iter->key();
Slice value = iter->value();
++i;
if (read_num > 0 && i > read_num)
break;
ParsedInternalKey ikey;
if (!ParseInternalKey(key, &ikey)) {
std::cerr << "Internal Key ["
<< key.ToString(true /* in hex*/)
<< "] parse error!\n";
continue;
}
// the key returned is not prefixed with out 'from' key
if (use_from_as_prefix && !ikey.user_key.starts_with(from_key)) {
break;
}
// If end marker was specified, we stop before it
if (has_to && BytewiseComparator()->Compare(ikey.user_key, to_key) >= 0) {
break;
}
if (print_kv) {
fprintf(stdout, "%s => %s\n",
ikey.DebugString(output_hex_).c_str(),
value.ToString(output_hex_).c_str());
}
}
read_num_ += i;
Status ret = iter->status();
delete iter;
return ret;
}
Status SstFileReader::ReadTableProperties(
std::shared_ptr<const TableProperties>* table_properties) {
if (!table_reader_) {
return init_result_;
}
*table_properties = table_reader_->GetTableProperties();
return init_result_;
}
namespace {
void print_help() {
fprintf(stderr,
R"(sst_dump --file=<data_dir_OR_sst_file> [--command=check|scan|raw]
--file=<data_dir_OR_sst_file>
Path to SST file or directory containing SST files
--command=check|scan|raw
check: Iterate over entries in files but dont print anything except if an error is encounterd (default command)
scan: Iterate over entries in files and print them to screen
raw: Dump all the table contents to <file_name>_dump.txt
--output_hex
Can be combined with scan command to print the keys and values in Hex
--from=<user_key>
Key to start reading from when executing check|scan
--to=<user_key>
Key to stop reading at when executing check|scan
--prefix=<user_key>
Returns all keys with this prefix when executing check|scan
Cannot be used in conjunction with --from
--read_num=<num>
Maximum number of entries to read when executing check|scan
--verify_checksum
Verify file checksum when executing check|scan
--input_key_hex
Can be combined with --from and --to to indicate that these values are encoded in Hex
--show_properties
Print table properties after iterating over the file
--show_compression_sizes
Independent command that will recreate the SST file using 16K block size with different
compressions and report the size of the file using such compression
--set_block_size=<block_size>
Can be combined with --show_compression_sizes to set the block size that will be used
when trying different compression algorithms
--parse_internal_key=<0xKEY>
Convenience option to parse an internal key on the command line. Dumps the
internal key in hex format {'key' @ SN: type}
)");
}
} // namespace
int SSTDumpTool::Run(int argc, char** argv) {
const char* dir_or_file = nullptr;
uint64_t read_num = -1;
std::string command;
char junk;
uint64_t n;
bool verify_checksum = false;
bool output_hex = false;
bool input_key_hex = false;
bool has_from = false;
bool has_to = false;
bool use_from_as_prefix = false;
bool show_properties = false;
bool show_compression_sizes = false;
bool show_summary = false;
bool set_block_size = false;
std::string from_key;
std::string to_key;
std::string block_size_str;
size_t block_size;
uint64_t total_num_files = 0;
uint64_t total_num_data_blocks = 0;
uint64_t total_data_block_size = 0;
uint64_t total_index_block_size = 0;
uint64_t total_filter_block_size = 0;
for (int i = 1; i < argc; i++) {
if (strncmp(argv[i], "--file=", 7) == 0) {
dir_or_file = argv[i] + 7;
} else if (strcmp(argv[i], "--output_hex") == 0) {
output_hex = true;
} else if (strcmp(argv[i], "--input_key_hex") == 0) {
input_key_hex = true;
} else if (sscanf(argv[i],
"--read_num=%lu%c",
(unsigned long*)&n, &junk) == 1) {
read_num = n;
} else if (strcmp(argv[i], "--verify_checksum") == 0) {
verify_checksum = true;
} else if (strncmp(argv[i], "--command=", 10) == 0) {
command = argv[i] + 10;
} else if (strncmp(argv[i], "--from=", 7) == 0) {
from_key = argv[i] + 7;
has_from = true;
} else if (strncmp(argv[i], "--to=", 5) == 0) {
to_key = argv[i] + 5;
has_to = true;
} else if (strncmp(argv[i], "--prefix=", 9) == 0) {
from_key = argv[i] + 9;
use_from_as_prefix = true;
} else if (strcmp(argv[i], "--show_properties") == 0) {
show_properties = true;
} else if (strcmp(argv[i], "--show_compression_sizes") == 0) {
show_compression_sizes = true;
} else if (strcmp(argv[i], "--show_summary") == 0) {
show_summary = true;
} else if (strncmp(argv[i], "--set_block_size=", 17) == 0) {
set_block_size = true;
block_size_str = argv[i] + 17;
std::istringstream iss(block_size_str);
if (iss.fail()) {
fprintf(stderr, "block size must be numeric");
exit(1);
}
iss >> block_size;
} else if (strncmp(argv[i], "--parse_internal_key=", 21) == 0) {
std::string in_key(argv[i] + 21);
try {
in_key = rocksdb::LDBCommand::HexToString(in_key);
} catch (...) {
std::cerr << "ERROR: Invalid key input '"
<< in_key
<< "' Use 0x{hex representation of internal rocksdb key}" << std::endl;
return -1;
}
Slice sl_key = rocksdb::Slice(in_key);
ParsedInternalKey ikey;
int retc = 0;
if (!ParseInternalKey(sl_key, &ikey)) {
std::cerr << "Internal Key [" << sl_key.ToString(true /* in hex*/)
<< "] parse error!\n";
retc = -1;
}
fprintf(stdout, "key=%s\n", ikey.DebugString(true).c_str());
return retc;
} else {
fprintf(stderr, "Unrecognized argument '%s'\n\n", argv[i]);
print_help();
exit(1);
}
}
if (use_from_as_prefix && has_from) {
fprintf(stderr, "Cannot specify --prefix and --from\n\n");
exit(1);
}
if (input_key_hex) {
if (has_from || use_from_as_prefix) {
from_key = rocksdb::LDBCommand::HexToString(from_key);
}
if (has_to) {
to_key = rocksdb::LDBCommand::HexToString(to_key);
}
}
if (dir_or_file == nullptr) {
fprintf(stderr, "file or directory must be specified.\n\n");
print_help();
exit(1);
}
std::vector<std::string> filenames;
rocksdb::Env* env = rocksdb::Env::Default();
rocksdb::Status st = env->GetChildren(dir_or_file, &filenames);
bool dir = true;
if (!st.ok()) {
filenames.clear();
filenames.push_back(dir_or_file);
dir = false;
}
fprintf(stdout, "from [%s] to [%s]\n",
rocksdb::Slice(from_key).ToString(true).c_str(),
rocksdb::Slice(to_key).ToString(true).c_str());
uint64_t total_read = 0;
for (size_t i = 0; i < filenames.size(); i++) {
std::string filename = filenames.at(i);
if (filename.length() <= 4 ||
filename.rfind(".sst") != filename.length() - 4) {
// ignore
continue;
}
if (dir) {
filename = std::string(dir_or_file) + "/" + filename;
}
rocksdb::SstFileReader reader(filename, verify_checksum,
output_hex);
if (!reader.getStatus().ok()) {
fprintf(stderr, "%s: %s\n", filename.c_str(),
reader.getStatus().ToString().c_str());
continue;
}
if (show_compression_sizes) {
if (set_block_size) {
reader.ShowAllCompressionSizes(block_size);
} else {
reader.ShowAllCompressionSizes(16384);
}
return 0;
}
if (command == "raw") {
std::string out_filename = filename.substr(0, filename.length() - 4);
out_filename.append("_dump.txt");
st = reader.DumpTable(out_filename);
if (!st.ok()) {
fprintf(stderr, "%s: %s\n", filename.c_str(), st.ToString().c_str());
exit(1);
} else {
fprintf(stdout, "raw dump written to file %s\n", &out_filename[0]);
}
continue;
}
// scan all files in give file path.
if (command == "" || command == "scan" || command == "check") {
st = reader.ReadSequential(
command == "scan", read_num > 0 ? (read_num - total_read) : read_num,
has_from || use_from_as_prefix, from_key, has_to, to_key,
use_from_as_prefix);
if (!st.ok()) {
fprintf(stderr, "%s: %s\n", filename.c_str(),
st.ToString().c_str());
}
total_read += reader.GetReadNumber();
if (read_num > 0 && total_read > read_num) {
break;
}
}
if (show_properties || show_summary) {
const rocksdb::TableProperties* table_properties;
std::shared_ptr<const rocksdb::TableProperties>
table_properties_from_reader;
st = reader.ReadTableProperties(&table_properties_from_reader);
if (!st.ok()) {
fprintf(stderr, "%s: %s\n", filename.c_str(), st.ToString().c_str());
fprintf(stderr, "Try to use initial table properties\n");
table_properties = reader.GetInitTableProperties();
} else {
table_properties = table_properties_from_reader.get();
}
if (table_properties != nullptr) {
if (show_properties) {
fprintf(stdout,
"Table Properties:\n"
"------------------------------\n"
" %s",
table_properties->ToString("\n ", ": ").c_str());
fprintf(stdout, "# deleted keys: %" PRIu64 "\n",
rocksdb::GetDeletedKeys(
table_properties->user_collected_properties));
bool property_present;
uint64_t merge_operands = rocksdb::GetMergeOperands(
table_properties->user_collected_properties, &property_present);
if (property_present) {
fprintf(stdout, " # merge operands: %" PRIu64 "\n",
merge_operands);
} else {
fprintf(stdout, " # merge operands: UNKNOWN\n");
}
}
total_num_files += 1;
total_num_data_blocks += table_properties->num_data_blocks;
total_data_block_size += table_properties->data_size;
total_index_block_size += table_properties->index_size;
total_filter_block_size += table_properties->filter_size;
}
if (show_properties) {
fprintf(stdout,
"Raw user collected properties\n"
"------------------------------\n");
for (const auto& kv : table_properties->user_collected_properties) {
std::string prop_name = kv.first;
std::string prop_val = Slice(kv.second).ToString(true);
fprintf(stdout, " # %s: 0x%s\n", prop_name.c_str(),
prop_val.c_str());
}
}
}
}
if (show_summary) {
fprintf(stdout, "total number of files: %" PRIu64 "\n", total_num_files);
fprintf(stdout, "total number of data blocks: %" PRIu64 "\n",
total_num_data_blocks);
fprintf(stdout, "total data block size: %" PRIu64 "\n",
total_data_block_size);
fprintf(stdout, "total index block size: %" PRIu64 "\n",
total_index_block_size);
fprintf(stdout, "total filter block size: %" PRIu64 "\n",
total_filter_block_size);
}
return 0;
}
} // namespace rocksdb
#endif // ROCKSDB_LITE
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