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https://github.com/facebook/rocksdb.git
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74d419be4d
Summary: This PR adds support to programmatically iterate a raw table file with an iterator returned by `SstFileReader::NewTableIterator`. For third party tools to use to observe SST files created by RocksDB. The original feature request was from this merge request: https://github.com/facebook/rocksdb/pull/12370 Since keys returned by raw table iterators are internal keys, this PR also adds a struct `ParsedEntryInfo` and util method `ParseEntry` to support user to parse internal key. `GetInternalKeyForSeek`, and `GetInternalKeyForSeekForPrev` to support users to create internal keys for seek operations with this raw table iterator. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12385 Test Plan: Added unit tests Reviewed By: cbi42 Differential Revision: D55662855 Pulled By: jowlyzhang fbshipit-source-id: 0716a173ee95924fbd4e1f9b6cccf06525c40049
89 lines
3 KiB
C++
89 lines
3 KiB
C++
// Copyright (c) Meta Platforms, Inc. and affiliates.
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//
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#include "rocksdb/utilities/types_util.h"
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#include "db/dbformat.h"
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namespace ROCKSDB_NAMESPACE {
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Status GetInternalKeyForSeek(const Slice& user_key,
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const Comparator* comparator, std::string* buf) {
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if (!comparator) {
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return Status::InvalidArgument(
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"Constructing an internal key requires user key comparator.");
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}
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size_t ts_sz = comparator->timestamp_size();
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Slice max_ts = comparator->GetMaxTimestamp();
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if (ts_sz != max_ts.size()) {
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return Status::InvalidArgument(
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"The maximum timestamp returned by Comparator::GetMaxTimestamp is "
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"invalid.");
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}
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buf->reserve(user_key.size() + ts_sz + kNumInternalBytes);
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buf->assign(user_key.data(), user_key.size());
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if (ts_sz) {
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buf->append(max_ts.data(), max_ts.size());
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}
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PutFixed64(buf, PackSequenceAndType(kMaxSequenceNumber, kValueTypeForSeek));
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return Status::OK();
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}
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Status GetInternalKeyForSeekForPrev(const Slice& user_key,
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const Comparator* comparator,
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std::string* buf) {
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if (!comparator) {
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return Status::InvalidArgument(
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"Constructing an internal key requires user key comparator.");
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}
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size_t ts_sz = comparator->timestamp_size();
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Slice min_ts = comparator->GetMinTimestamp();
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if (ts_sz != min_ts.size()) {
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return Status::InvalidArgument(
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"The minimum timestamp returned by Comparator::GetMinTimestamp is "
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"invalid.");
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}
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buf->reserve(user_key.size() + ts_sz + kNumInternalBytes);
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buf->assign(user_key.data(), user_key.size());
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if (ts_sz) {
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buf->append(min_ts.data(), min_ts.size());
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}
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PutFixed64(buf, PackSequenceAndType(0, kValueTypeForSeekForPrev));
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return Status::OK();
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}
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Status ParseEntry(const Slice& internal_key, const Comparator* comparator,
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ParsedEntryInfo* parsed_entry) {
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if (internal_key.size() < kNumInternalBytes) {
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return Status::InvalidArgument("Internal key size invalid.");
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}
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if (!comparator) {
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return Status::InvalidArgument(
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"Parsing an internal key requires user key comparator.");
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}
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ParsedInternalKey pikey;
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Status status = ParseInternalKey(internal_key, &pikey, /*log_err_key=*/false);
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if (!status.ok()) {
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return status;
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}
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size_t ts_sz = comparator->timestamp_size();
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if (pikey.user_key.size() < ts_sz) {
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return Status::InvalidArgument("User key(with timestamp) size invalid.");
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}
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if (ts_sz == 0) {
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parsed_entry->user_key = pikey.user_key;
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} else {
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parsed_entry->user_key = StripTimestampFromUserKey(pikey.user_key, ts_sz);
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parsed_entry->timestamp =
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ExtractTimestampFromUserKey(pikey.user_key, ts_sz);
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}
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parsed_entry->sequence = pikey.sequence;
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parsed_entry->type = ROCKSDB_NAMESPACE::GetEntryType(pikey.type);
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return Status::OK();
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}
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} // namespace ROCKSDB_NAMESPACE
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