1551f1011a
Summary: This patch is groundwork for an upcoming change to store the set of linked SSTs in `BlobFileMetaData`. With the current code, a new `BlobFileMetaData` object is created each time a `VersionEdit` touches a certain blob file. This is fine as long as these objects are lightweight and cheap to create; however, with the addition of the linked SST set, it would be very inefficient since the set would have to be copied over and over again. Note that this is the same kind of problem that `VersionBuilder` is solving w/r/t `Version`s and files, and we can apply the same solution; that is, we can accumulate the changes in a different mutable object, and apply the delta in one shot when the changes are committed. The patch does exactly that by adding a new `BlobFileMetaDataDelta` class to `VersionBuilder`. In addition, it turns the existing `GetBlobFileMetaData` helper into `IsBlobFileInVersion` (which is fine since that's the only thing the method's clients care about now), and adds a couple of helper methods that can create a `BlobFileMetaData` object from the `BlobFileMetaData` in the base (if applicable) and the delta when the `Version` is saved. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6835 Test Plan: `make check` Reviewed By: riversand963 Differential Revision: D21505187 Pulled By: ltamasi fbshipit-source-id: d81a48c5f2ca7b79d7124c935332a6bcf3d5d988 |
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| db | ||
| db_stress_tool | ||
| docs | ||
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| file | ||
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| include/rocksdb | ||
| java | ||
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| options | ||
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| table | ||
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| AUTHORS | ||
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| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| COPYING | ||
| DEFAULT_OPTIONS_HISTORY.md | ||
| defs.bzl | ||
| DUMP_FORMAT.md | ||
| HISTORY.md | ||
| INSTALL.md | ||
| issue_template.md | ||
| LANGUAGE-BINDINGS.md | ||
| LICENSE.Apache | ||
| LICENSE.leveldb | ||
| Makefile | ||
| README.md | ||
| ROCKSDB_LITE.md | ||
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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/master/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.
Design discussions are conducted in https://www.facebook.com/groups/rocksdb.dev/ and https://rocksdb.slack.com/
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.