826295a5e9
Summary: Previously in LITE mode, an autovector did not have a reserved size. When elements were added to the vector, the underlying array could be reallocated. There was a set of code that never expands the autovector and was doing &autovector::back(). When the vector is resized, the old addresses may become invalid, causing a later exception to be thrown. By reserving space in the autovector up front, this problem is eliminated for those uses where the vector will never exceed the initial size. the resize happens, these pointers become invalid, leading to SEGV or other exceptions. This change allows the autovector to be fully populated before we take the address of any of its elements, thereby elminating the potential for a resize. There is comparable code to this change in Version::MultiGet for dealing with the context objects. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6868 Reviewed By: ajkr Differential Revision: D21693505 Pulled By: cheng-chang fbshipit-source-id: e71d516b15e08f202593cb80f2a42f048fc95768
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.