ecfca1ff59
Summary: If there are a lot of overlapped files in L0, creating a merging iterator for all files in L0 to check overlap can be very slow because we need to read and seek all files in L0. However, in that case, the ingested file is likely to overlap with some files in L0, so if we check those files one by one, we can stop once we encounter overlap. Ref: https://github.com/facebook/rocksdb/issues/3540 Closes https://github.com/facebook/rocksdb/pull/3564 Differential Revision: D7196784 Pulled By: anand1976 fbshipit-source-id: 8700c1e903bd515d0fa7005b6ce9b3a3d9db2d67
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 specially 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/
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.