babce11705
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/15396 ## Summary `ParseEntry()` exposes the components of an internal key, but constructing one with a chosen sequence number and entry type currently requires private RocksDB utilities or duplicating the encoding. Add public `EncodeEntry()` to construct a stored internal key from `ParsedEntryInfo`, including its user key, timestamp, sequence number, and entry type. Also expose `PackSequenceAndType()` and `UnPackSequenceAndType()` to work with the sequence/type footer as a `uint64_t`. The helpers map all nine representable public entry types to their internal types and use the existing footer encoding; `EncodeEntry()` reuses the public packer. Packing `kEntryOther` or a sequence number above the 56-bit limit returns `InvalidArgument` without changing the output. Unpacking reports internal value types without a public equivalent as `kEntryOther`. Timestamp size remains the caller's responsibility, and input slices must not alias the output string. These are additive C++ utilities using the existing internal-key format. Reviewed By: anand1976, xingbowang Differential Revision: D125082298 fbshipit-source-id: 6c09a31695f1d377b9cc208fa5b6edd3ad6638e2
RocksDB: A Persistent Key-Value Store for Flash and RAM Storage
RocksDB is developed and maintained by Facebook Database Engineering Team. It is built on earlier work on LevelDB by Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com)
This code is a library that forms the core building block for a fast key-value server, especially suited for storing data on flash drives. It has a Log-Structured-Merge-Database (LSM) design with flexible tradeoffs between Write-Amplification-Factor (WAF), Read-Amplification-Factor (RAF) and Space-Amplification-Factor (SAF). It has multi-threaded compactions, making it especially suitable for storing multiple terabytes of data in a single database.
Start with example usage here: https://github.com/facebook/rocksdb/tree/main/examples
See the github wiki for more explanation.
The public interface is in include/. Callers should not include or
rely on the details of any other header files in this package. Those
internal APIs may be changed without warning.
Questions and discussions are welcome on the RocksDB Developers Public Facebook group and email list on Google Groups.
License
RocksDB is dual-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). You may select, at your option, one of the above-listed licenses.