fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
564 lines
20 KiB
564 lines
20 KiB
// 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).
|
|
//
|
|
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file. See the AUTHORS file for names of contributors.
|
|
|
|
#include "table/format.h"
|
|
|
|
#include <cinttypes>
|
|
#include <string>
|
|
|
|
#include "block_fetcher.h"
|
|
#include "file/random_access_file_reader.h"
|
|
#include "memory/memory_allocator.h"
|
|
#include "monitoring/perf_context_imp.h"
|
|
#include "monitoring/statistics.h"
|
|
#include "options/options_helper.h"
|
|
#include "rocksdb/env.h"
|
|
#include "rocksdb/options.h"
|
|
#include "rocksdb/table.h"
|
|
#include "table/block_based/block.h"
|
|
#include "table/block_based/block_based_table_reader.h"
|
|
#include "table/persistent_cache_helper.h"
|
|
#include "util/cast_util.h"
|
|
#include "util/coding.h"
|
|
#include "util/compression.h"
|
|
#include "util/crc32c.h"
|
|
#include "util/hash.h"
|
|
#include "util/stop_watch.h"
|
|
#include "util/string_util.h"
|
|
#include "util/xxhash.h"
|
|
|
|
namespace ROCKSDB_NAMESPACE {
|
|
|
|
extern const uint64_t kLegacyBlockBasedTableMagicNumber;
|
|
extern const uint64_t kBlockBasedTableMagicNumber;
|
|
|
|
#ifndef ROCKSDB_LITE
|
|
extern const uint64_t kLegacyPlainTableMagicNumber;
|
|
extern const uint64_t kPlainTableMagicNumber;
|
|
#else
|
|
// ROCKSDB_LITE doesn't have plain table
|
|
const uint64_t kLegacyPlainTableMagicNumber = 0;
|
|
const uint64_t kPlainTableMagicNumber = 0;
|
|
#endif
|
|
const char* kHostnameForDbHostId = "__hostname__";
|
|
|
|
bool ShouldReportDetailedTime(Env* env, Statistics* stats) {
|
|
return env != nullptr && stats != nullptr &&
|
|
stats->get_stats_level() > kExceptDetailedTimers;
|
|
}
|
|
|
|
void BlockHandle::EncodeTo(std::string* dst) const {
|
|
// Sanity check that all fields have been set
|
|
assert(offset_ != ~uint64_t{0});
|
|
assert(size_ != ~uint64_t{0});
|
|
PutVarint64Varint64(dst, offset_, size_);
|
|
}
|
|
|
|
char* BlockHandle::EncodeTo(char* dst) const {
|
|
// Sanity check that all fields have been set
|
|
assert(offset_ != ~uint64_t{0});
|
|
assert(size_ != ~uint64_t{0});
|
|
char* cur = EncodeVarint64(dst, offset_);
|
|
cur = EncodeVarint64(cur, size_);
|
|
return cur;
|
|
}
|
|
|
|
Status BlockHandle::DecodeFrom(Slice* input) {
|
|
if (GetVarint64(input, &offset_) && GetVarint64(input, &size_)) {
|
|
return Status::OK();
|
|
} else {
|
|
// reset in case failure after partially decoding
|
|
offset_ = 0;
|
|
size_ = 0;
|
|
return Status::Corruption("bad block handle");
|
|
}
|
|
}
|
|
|
|
Status BlockHandle::DecodeSizeFrom(uint64_t _offset, Slice* input) {
|
|
if (GetVarint64(input, &size_)) {
|
|
offset_ = _offset;
|
|
return Status::OK();
|
|
} else {
|
|
// reset in case failure after partially decoding
|
|
offset_ = 0;
|
|
size_ = 0;
|
|
return Status::Corruption("bad block handle");
|
|
}
|
|
}
|
|
|
|
// Return a string that contains the copy of handle.
|
|
std::string BlockHandle::ToString(bool hex) const {
|
|
std::string handle_str;
|
|
EncodeTo(&handle_str);
|
|
if (hex) {
|
|
return Slice(handle_str).ToString(true);
|
|
} else {
|
|
return handle_str;
|
|
}
|
|
}
|
|
|
|
const BlockHandle BlockHandle::kNullBlockHandle(0, 0);
|
|
|
|
void IndexValue::EncodeTo(std::string* dst, bool have_first_key,
|
|
const BlockHandle* previous_handle) const {
|
|
if (previous_handle) {
|
|
// WART: this is specific to Block-based table
|
|
assert(handle.offset() == previous_handle->offset() +
|
|
previous_handle->size() +
|
|
BlockBasedTable::kBlockTrailerSize);
|
|
PutVarsignedint64(dst, handle.size() - previous_handle->size());
|
|
} else {
|
|
handle.EncodeTo(dst);
|
|
}
|
|
assert(dst->size() != 0);
|
|
|
|
if (have_first_key) {
|
|
PutLengthPrefixedSlice(dst, first_internal_key);
|
|
}
|
|
}
|
|
|
|
Status IndexValue::DecodeFrom(Slice* input, bool have_first_key,
|
|
const BlockHandle* previous_handle) {
|
|
if (previous_handle) {
|
|
int64_t delta;
|
|
if (!GetVarsignedint64(input, &delta)) {
|
|
return Status::Corruption("bad delta-encoded index value");
|
|
}
|
|
// WART: this is specific to Block-based table
|
|
handle = BlockHandle(previous_handle->offset() + previous_handle->size() +
|
|
BlockBasedTable::kBlockTrailerSize,
|
|
previous_handle->size() + delta);
|
|
} else {
|
|
Status s = handle.DecodeFrom(input);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
if (!have_first_key) {
|
|
first_internal_key = Slice();
|
|
} else if (!GetLengthPrefixedSlice(input, &first_internal_key)) {
|
|
return Status::Corruption("bad first key in block info");
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
std::string IndexValue::ToString(bool hex, bool have_first_key) const {
|
|
std::string s;
|
|
EncodeTo(&s, have_first_key, nullptr);
|
|
if (hex) {
|
|
return Slice(s).ToString(true);
|
|
} else {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
namespace {
|
|
inline bool IsLegacyFooterFormat(uint64_t magic_number) {
|
|
return magic_number == kLegacyBlockBasedTableMagicNumber ||
|
|
magic_number == kLegacyPlainTableMagicNumber;
|
|
}
|
|
inline uint64_t UpconvertLegacyFooterFormat(uint64_t magic_number) {
|
|
if (magic_number == kLegacyBlockBasedTableMagicNumber) {
|
|
return kBlockBasedTableMagicNumber;
|
|
}
|
|
if (magic_number == kLegacyPlainTableMagicNumber) {
|
|
return kPlainTableMagicNumber;
|
|
}
|
|
assert(false);
|
|
return 0;
|
|
}
|
|
} // namespace
|
|
|
|
Footer& Footer::set_table_magic_number(uint64_t magic_number) {
|
|
assert(table_magic_number_ == kNullTableMagicNumber);
|
|
table_magic_number_ = magic_number;
|
|
if (magic_number == kBlockBasedTableMagicNumber ||
|
|
magic_number == kLegacyBlockBasedTableMagicNumber) {
|
|
block_trailer_size_ =
|
|
static_cast<uint8_t>(BlockBasedTable::kBlockTrailerSize);
|
|
} else {
|
|
block_trailer_size_ = 0;
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
// Footer format, in three parts:
|
|
// * Part1
|
|
// -> format_version == 0 (inferred from legacy magic number)
|
|
// <empty> (0 bytes)
|
|
// -> format_version >= 1
|
|
// checksum type (char, 1 byte)
|
|
// * Part2
|
|
// metaindex handle (varint64 offset, varint64 size)
|
|
// index handle (varint64 offset, varint64 size)
|
|
// <zero padding> for part2 size = 2 * BlockHandle::kMaxEncodedLength = 40
|
|
// * Part3
|
|
// -> format_version == 0 (inferred from legacy magic number)
|
|
// legacy magic number (8 bytes)
|
|
// -> format_version >= 1 (inferred from NOT legacy magic number)
|
|
// format_version (uint32LE, 4 bytes), also called "footer version"
|
|
// newer magic number (8 bytes)
|
|
void Footer::EncodeTo(std::string* dst, uint64_t footer_offset) const {
|
|
(void)footer_offset; // Future use
|
|
|
|
// Sanitize magic numbers & format versions
|
|
assert(table_magic_number_ != kNullTableMagicNumber);
|
|
uint64_t magic = table_magic_number_;
|
|
uint32_t fv = format_version_;
|
|
assert(fv != kInvalidFormatVersion);
|
|
assert(IsLegacyFooterFormat(magic) == (fv == 0));
|
|
|
|
ChecksumType ct = checksum_type();
|
|
|
|
// Allocate destination data and generate parts 1 and 3
|
|
const size_t original_size = dst->size();
|
|
char* part2;
|
|
if (fv > 0) {
|
|
dst->resize(original_size + kNewVersionsEncodedLength);
|
|
char* part1 = &(*dst)[original_size];
|
|
part2 = part1 + 1;
|
|
char* part3 = part2 + 2 * BlockHandle::kMaxEncodedLength;
|
|
assert(&(*dst)[dst->size() - 1] + 1 - part3 == /* part 3 size */ 12);
|
|
// Generate parts 1 and 3
|
|
part1[0] = ct;
|
|
EncodeFixed32(part3, fv);
|
|
EncodeFixed64(part3 + 4, magic);
|
|
} else {
|
|
dst->resize(original_size + kVersion0EncodedLength);
|
|
part2 = &(*dst)[original_size];
|
|
char* part3 = part2 + 2 * BlockHandle::kMaxEncodedLength;
|
|
assert(&(*dst)[dst->size() - 1] + 1 - part3 == /* part 3 size */ 8);
|
|
// Legacy SST files use kCRC32c checksum but it's not stored in footer.
|
|
assert(ct == kNoChecksum || ct == kCRC32c);
|
|
// Generate part 3 (part 1 empty)
|
|
EncodeFixed64(part3, magic);
|
|
}
|
|
|
|
// Generate Part2
|
|
// Variable size encode handles (sigh)
|
|
part2 = metaindex_handle_.EncodeTo(part2);
|
|
/*part2 = */ index_handle_.EncodeTo(part2);
|
|
|
|
// remainder of part2 is already zero padded
|
|
}
|
|
|
|
Status Footer::DecodeFrom(Slice* input, uint64_t input_offset) {
|
|
(void)input_offset; // Future use
|
|
|
|
// Only decode to unused Footer
|
|
assert(table_magic_number_ == kNullTableMagicNumber);
|
|
assert(input != nullptr);
|
|
assert(input->size() >= kMinEncodedLength);
|
|
|
|
const char* magic_ptr =
|
|
input->data() + input->size() - kMagicNumberLengthByte;
|
|
uint64_t magic = DecodeFixed64(magic_ptr);
|
|
|
|
// We check for legacy formats here and silently upconvert them
|
|
bool legacy = IsLegacyFooterFormat(magic);
|
|
if (legacy) {
|
|
magic = UpconvertLegacyFooterFormat(magic);
|
|
}
|
|
set_table_magic_number(magic);
|
|
|
|
// Parse Part3
|
|
if (legacy) {
|
|
// The size is already asserted to be at least kMinEncodedLength
|
|
// at the beginning of the function
|
|
input->remove_prefix(input->size() - kVersion0EncodedLength);
|
|
format_version_ = 0 /* legacy */;
|
|
checksum_type_ = kCRC32c;
|
|
} else {
|
|
const char* part3_ptr = magic_ptr - 4;
|
|
format_version_ = DecodeFixed32(part3_ptr);
|
|
if (!IsSupportedFormatVersion(format_version_)) {
|
|
return Status::Corruption("Corrupt or unsupported format_version: " +
|
|
ROCKSDB_NAMESPACE::ToString(format_version_));
|
|
}
|
|
// All known format versions >= 1 occupy exactly this many bytes.
|
|
if (input->size() < kNewVersionsEncodedLength) {
|
|
return Status::Corruption("Input is too short to be an SST file");
|
|
}
|
|
uint64_t adjustment = input->size() - kNewVersionsEncodedLength;
|
|
input->remove_prefix(adjustment);
|
|
|
|
// Parse Part1
|
|
char chksum = input->data()[0];
|
|
checksum_type_ = lossless_cast<ChecksumType>(chksum);
|
|
if (!IsSupportedChecksumType(checksum_type())) {
|
|
return Status::Corruption(
|
|
"Corrupt or unsupported checksum type: " +
|
|
ROCKSDB_NAMESPACE::ToString(lossless_cast<uint8_t>(chksum)));
|
|
}
|
|
// Consume checksum type field
|
|
input->remove_prefix(1);
|
|
}
|
|
|
|
// Parse Part2
|
|
Status result = metaindex_handle_.DecodeFrom(input);
|
|
if (result.ok()) {
|
|
result = index_handle_.DecodeFrom(input);
|
|
}
|
|
if (!result.ok()) {
|
|
return result;
|
|
}
|
|
|
|
// Mark all input consumed (skip padding & part3)
|
|
*input = Slice(input->data() + input->size(), 0U);
|
|
return Status::OK();
|
|
}
|
|
|
|
std::string Footer::ToString() const {
|
|
std::string result;
|
|
result.reserve(1024);
|
|
|
|
bool legacy = IsLegacyFooterFormat(table_magic_number_);
|
|
if (legacy) {
|
|
result.append("metaindex handle: " + metaindex_handle_.ToString() + "\n ");
|
|
result.append("index handle: " + index_handle_.ToString() + "\n ");
|
|
result.append("table_magic_number: " +
|
|
ROCKSDB_NAMESPACE::ToString(table_magic_number_) + "\n ");
|
|
} else {
|
|
result.append("metaindex handle: " + metaindex_handle_.ToString() + "\n ");
|
|
result.append("index handle: " + index_handle_.ToString() + "\n ");
|
|
result.append("table_magic_number: " +
|
|
ROCKSDB_NAMESPACE::ToString(table_magic_number_) + "\n ");
|
|
result.append("format version: " +
|
|
ROCKSDB_NAMESPACE::ToString(format_version_) + "\n ");
|
|
}
|
|
return result;
|
|
}
|
|
|
|
Status ReadFooterFromFile(const IOOptions& opts, RandomAccessFileReader* file,
|
|
FilePrefetchBuffer* prefetch_buffer,
|
|
uint64_t file_size, Footer* footer,
|
|
uint64_t enforce_table_magic_number) {
|
|
if (file_size < Footer::kMinEncodedLength) {
|
|
return Status::Corruption("file is too short (" + ToString(file_size) +
|
|
" bytes) to be an "
|
|
"sstable: " +
|
|
file->file_name());
|
|
}
|
|
|
|
std::string footer_buf;
|
|
AlignedBuf internal_buf;
|
|
Slice footer_input;
|
|
uint64_t read_offset = (file_size > Footer::kMaxEncodedLength)
|
|
? file_size - Footer::kMaxEncodedLength
|
|
: 0;
|
|
Status s;
|
|
// TODO: Need to pass appropriate deadline to TryReadFromCache(). Right now,
|
|
// there is no readahead for point lookups, so TryReadFromCache will fail if
|
|
// the required data is not in the prefetch buffer. Once deadline is enabled
|
|
// for iterator, TryReadFromCache might do a readahead. Revisit to see if we
|
|
// need to pass a timeout at that point
|
|
if (prefetch_buffer == nullptr ||
|
|
!prefetch_buffer->TryReadFromCache(IOOptions(), file, read_offset,
|
|
Footer::kMaxEncodedLength,
|
|
&footer_input, nullptr)) {
|
|
if (file->use_direct_io()) {
|
|
s = file->Read(opts, read_offset, Footer::kMaxEncodedLength,
|
|
&footer_input, nullptr, &internal_buf);
|
|
} else {
|
|
footer_buf.reserve(Footer::kMaxEncodedLength);
|
|
s = file->Read(opts, read_offset, Footer::kMaxEncodedLength,
|
|
&footer_input, &footer_buf[0], nullptr);
|
|
}
|
|
if (!s.ok()) return s;
|
|
}
|
|
|
|
// Check that we actually read the whole footer from the file. It may be
|
|
// that size isn't correct.
|
|
if (footer_input.size() < Footer::kMinEncodedLength) {
|
|
return Status::Corruption("file is too short (" + ToString(file_size) +
|
|
" bytes) to be an "
|
|
"sstable" +
|
|
file->file_name());
|
|
}
|
|
|
|
s = footer->DecodeFrom(&footer_input, read_offset);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
if (enforce_table_magic_number != 0 &&
|
|
enforce_table_magic_number != footer->table_magic_number()) {
|
|
return Status::Corruption(
|
|
"Bad table magic number: expected " +
|
|
ToString(enforce_table_magic_number) + ", found " +
|
|
ToString(footer->table_magic_number()) + " in " + file->file_name());
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
namespace {
|
|
// Custom handling for the last byte of a block, to avoid invoking streaming
|
|
// API to get an effective block checksum. This function is its own inverse
|
|
// because it uses xor.
|
|
inline uint32_t ModifyChecksumForLastByte(uint32_t checksum, char last_byte) {
|
|
// This strategy bears some resemblance to extending a CRC checksum by one
|
|
// more byte, except we don't need to re-mix the input checksum as long as
|
|
// we do this step only once (per checksum).
|
|
const uint32_t kRandomPrime = 0x6b9083d9;
|
|
return checksum ^ lossless_cast<uint8_t>(last_byte) * kRandomPrime;
|
|
}
|
|
} // namespace
|
|
|
|
uint32_t ComputeBuiltinChecksum(ChecksumType type, const char* data,
|
|
size_t data_size) {
|
|
switch (type) {
|
|
case kCRC32c:
|
|
return crc32c::Mask(crc32c::Value(data, data_size));
|
|
case kxxHash:
|
|
return XXH32(data, data_size, /*seed*/ 0);
|
|
case kxxHash64:
|
|
return Lower32of64(XXH64(data, data_size, /*seed*/ 0));
|
|
case kXXH3: {
|
|
if (data_size == 0) {
|
|
// Special case because of special handling for last byte, not
|
|
// present in this case. Can be any value different from other
|
|
// small input size checksums.
|
|
return 0;
|
|
} else {
|
|
// See corresponding code in ComputeBuiltinChecksumWithLastByte
|
|
uint32_t v = Lower32of64(XXH3_64bits(data, data_size - 1));
|
|
return ModifyChecksumForLastByte(v, data[data_size - 1]);
|
|
}
|
|
}
|
|
default: // including kNoChecksum
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
uint32_t ComputeBuiltinChecksumWithLastByte(ChecksumType type, const char* data,
|
|
size_t data_size, char last_byte) {
|
|
switch (type) {
|
|
case kCRC32c: {
|
|
uint32_t crc = crc32c::Value(data, data_size);
|
|
// Extend to cover last byte (compression type)
|
|
crc = crc32c::Extend(crc, &last_byte, 1);
|
|
return crc32c::Mask(crc);
|
|
}
|
|
case kxxHash: {
|
|
XXH32_state_t* const state = XXH32_createState();
|
|
XXH32_reset(state, 0);
|
|
XXH32_update(state, data, data_size);
|
|
// Extend to cover last byte (compression type)
|
|
XXH32_update(state, &last_byte, 1);
|
|
uint32_t v = XXH32_digest(state);
|
|
XXH32_freeState(state);
|
|
return v;
|
|
}
|
|
case kxxHash64: {
|
|
XXH64_state_t* const state = XXH64_createState();
|
|
XXH64_reset(state, 0);
|
|
XXH64_update(state, data, data_size);
|
|
// Extend to cover last byte (compression type)
|
|
XXH64_update(state, &last_byte, 1);
|
|
uint32_t v = Lower32of64(XXH64_digest(state));
|
|
XXH64_freeState(state);
|
|
return v;
|
|
}
|
|
case kXXH3: {
|
|
// XXH3 is a complicated hash function that is extremely fast on
|
|
// contiguous input, but that makes its streaming support rather
|
|
// complex. It is worth custom handling of the last byte (`type`)
|
|
// in order to avoid allocating a large state object and bringing
|
|
// that code complexity into CPU working set.
|
|
uint32_t v = Lower32of64(XXH3_64bits(data, data_size));
|
|
return ModifyChecksumForLastByte(v, last_byte);
|
|
}
|
|
default: // including kNoChecksum
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
Status UncompressBlockContentsForCompressionType(
|
|
const UncompressionInfo& uncompression_info, const char* data, size_t n,
|
|
BlockContents* contents, uint32_t format_version,
|
|
const ImmutableOptions& ioptions, MemoryAllocator* allocator) {
|
|
Status ret = Status::OK();
|
|
|
|
assert(uncompression_info.type() != kNoCompression &&
|
|
"Invalid compression type");
|
|
|
|
StopWatchNano timer(ioptions.clock,
|
|
ShouldReportDetailedTime(ioptions.env, ioptions.stats));
|
|
size_t uncompressed_size = 0;
|
|
CacheAllocationPtr ubuf =
|
|
UncompressData(uncompression_info, data, n, &uncompressed_size,
|
|
GetCompressFormatForVersion(format_version), allocator);
|
|
if (!ubuf) {
|
|
if (!CompressionTypeSupported(uncompression_info.type())) {
|
|
return Status::NotSupported(
|
|
"Unsupported compression method for this build",
|
|
CompressionTypeToString(uncompression_info.type()));
|
|
} else {
|
|
return Status::Corruption(
|
|
"Corrupted compressed block contents",
|
|
CompressionTypeToString(uncompression_info.type()));
|
|
}
|
|
}
|
|
|
|
*contents = BlockContents(std::move(ubuf), uncompressed_size);
|
|
|
|
if (ShouldReportDetailedTime(ioptions.env, ioptions.stats)) {
|
|
RecordTimeToHistogram(ioptions.stats, DECOMPRESSION_TIMES_NANOS,
|
|
timer.ElapsedNanos());
|
|
}
|
|
RecordTimeToHistogram(ioptions.stats, BYTES_DECOMPRESSED,
|
|
contents->data.size());
|
|
RecordTick(ioptions.stats, NUMBER_BLOCK_DECOMPRESSED);
|
|
|
|
TEST_SYNC_POINT_CALLBACK(
|
|
"UncompressBlockContentsForCompressionType:TamperWithReturnValue",
|
|
static_cast<void*>(&ret));
|
|
TEST_SYNC_POINT_CALLBACK(
|
|
"UncompressBlockContentsForCompressionType:"
|
|
"TamperWithDecompressionOutput",
|
|
static_cast<void*>(contents));
|
|
|
|
return ret;
|
|
}
|
|
|
|
//
|
|
// The 'data' points to the raw block contents that was read in from file.
|
|
// This method allocates a new heap buffer and the raw block
|
|
// contents are uncompresed into this buffer. This
|
|
// buffer is returned via 'result' and it is upto the caller to
|
|
// free this buffer.
|
|
// format_version is the block format as defined in include/rocksdb/table.h
|
|
Status UncompressBlockContents(const UncompressionInfo& uncompression_info,
|
|
const char* data, size_t n,
|
|
BlockContents* contents, uint32_t format_version,
|
|
const ImmutableOptions& ioptions,
|
|
MemoryAllocator* allocator) {
|
|
assert(data[n] != kNoCompression);
|
|
assert(data[n] == static_cast<char>(uncompression_info.type()));
|
|
return UncompressBlockContentsForCompressionType(uncompression_info, data, n,
|
|
contents, format_version,
|
|
ioptions, allocator);
|
|
}
|
|
|
|
// Replace the contents of db_host_id with the actual hostname, if db_host_id
|
|
// matches the keyword kHostnameForDbHostId
|
|
Status ReifyDbHostIdProperty(Env* env, std::string* db_host_id) {
|
|
assert(db_host_id);
|
|
if (*db_host_id == kHostnameForDbHostId) {
|
|
Status s = env->GetHostNameString(db_host_id);
|
|
if (!s.ok()) {
|
|
db_host_id->clear();
|
|
}
|
|
return s;
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
} // namespace ROCKSDB_NAMESPACE
|
|
|