3eab41d7c4
Summary: To correct a build process where the JAVA_TEST_LIBDIR is a symlink to a cache directory. Test -s (size 0) on symlinks returns true, resulting in a mkdir over the top of the symlink resulting in failure. As a solution -d checks if it is a directory (or the symlink refers to a directory), which works in the case of real directories and symlinks to directories. Trivial I know but it was really easy for me to use a symlink here to prevent frequent downloads in a CI environment. Thanks for your consideration. Closes https://github.com/facebook/rocksdb/pull/1917 Differential Revision: D4612263 Pulled By: siying fbshipit-source-id: 4d458f8e1760068cdd6b5eae4bce6e12c400df41
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/