Andrew Kryczka 19fde54841 initialize local variable for UBSAN in PosixEnv function
Summary:
this is a repeat commit of a8a28da2159648a2f72c35ea507371df8a97a2a9, which got reverted together with 6afe22db2e667799d8c903db61750d676bffe152, but forgotten about when that commit was un-reverted in 46152d53bf58748fc3ed0681d8970c342bcfc47a.
Closes https://github.com/facebook/rocksdb/pull/3796

Differential Revision: D7826077

Pulled By: ajkr

fbshipit-source-id: edb22375da56e2feda50c5b35f942f4d2d52b19c
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RocksDB: A Persistent Key-Value Store for Flash and RAM Storage

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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.

Description
A library that provides an embeddable, persistent key-value store for fast storage.
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