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Andrew Kryczka 6a9335dbbb always drop tombstones compacted to bottommost level 
Summary:
Problem was in bottommost compaction, when an L0->L0 compaction happened and L0 was bottommost. Then we'd preserve tombstones according to `Compaction::KeyNotExistsBeyondOutputLevel`, while zeroing seqnum according to `CompactionIterator::PrepareOutput`, thus triggering the assertion in `PrepareOutput`. To fix, we can just drop tombstones in L0->L0 when the output is "bottommost", i.e., the compaction includes the oldest L0 file and there's nothing at lower levels.
Closes https://github.com/facebook/rocksdb/pull/3085

Differential Revision: D6175742

Pulled By: ajkr

fbshipit-source-id: 8ab19a2e001496f362e9eb0a71757e2f6ecfdb3b
 		2017-10-27 15:56:35 -07:00
buckifier rocksdb: make buildable on aarch64 2017-08-13 17:13:54 -07:00
build_tools fix lite build 2017-10-17 08:57:09 -07:00
cache Fix coverity uninitialized fields warnings in lru_cache 2017-10-27 11:26:43 -07:00
cmake CMake: Add support for CMake packages 2017-08-28 17:14:37 -07:00
coverage Fix /bin/bash shebangs 2017-08-03 15:56:46 -07:00
db always drop tombstones compacted to bottommost level 2017-10-27 15:56:35 -07:00
docs Blog post for 5.8 release 2017-09-28 10:14:09 -07:00
env Fix build on OpenBSD 2017-10-24 13:27:38 -07:00
examples Pinnableslice examples and blog post 2017-08-24 12:26:07 -07:00
hdfs Revert "comment out unused parameters" 2017-07-21 18:26:26 -07:00
include/rocksdb TableProperty::oldest_key_time defaults to 0 2017-10-27 15:00:05 -07:00
java added missing subcodes and improved error message for missing enum values 2017-10-23 16:42:07 -07:00
memtable Enable MSVC W4 with a few exceptions. Fix warnings and bugs 2017-10-19 10:57:12 -07:00
monitoring Fix unused var warnings in Release mode 2017-10-23 14:27:04 -07:00
options Fix coverity issue for MutableDBOptions default constructor 2017-10-26 20:56:45 -07:00
port Enable cacheline_aligned_alloc() to allocate from jemalloc if enabled. 2017-10-27 13:27:12 -07:00
table TableProperty::oldest_key_time defaults to 0 2017-10-27 15:00:05 -07:00
third-party Enable MSVC W4 with a few exceptions. Fix warnings and bugs 2017-10-19 10:57:12 -07:00
tools db_stress support long-held snapshots 2017-10-20 15:26:59 -07:00
util Mark files as trash by using .trash extension 2017-10-27 13:27:12 -07:00
utilities Blob DB: update blob file format 2017-10-27 13:27:12 -07:00
.clang-format A script that automatically reformat affected lines 2014-01-14 12:21:24 -08:00
.gitignore Remove leftover references to phutil_module_cache 2017-08-23 12:12:21 -07:00
.travis.yml fix lite build 2017-10-17 08:57:09 -07:00
AUTHORS Update RocksDB Authors File 2017-10-18 14:42:10 -07:00
CMakeLists.txt Enable cacheline_aligned_alloc() to allocate from jemalloc if enabled. 2017-10-27 13:27:12 -07:00
CONTRIBUTING.md Remove the licensing description in CONTRIBUTING.md 2017-07-16 15:57:18 -07:00
COPYING Add GPLv2 as an alternative license. 2017-04-27 18:06:12 -07:00
DEFAULT_OPTIONS_HISTORY.md options.delayed_write_rate use the rate of rate_limiter by default. 2017-05-24 09:58:24 -07:00
DUMP_FORMAT.md First version of rocksdb_dump and rocksdb_undump. 2015-06-19 16:24:36 -07:00
HISTORY.md Mark files as trash by using .trash extension 2017-10-27 13:27:12 -07:00
INSTALL.md Default one to rocksdb:x64-windows 2017-09-28 16:12:24 -07:00
LANGUAGE-BINDINGS.md add Erlang to the list of language bindings 2017-08-28 16:43:16 -07:00
LICENSE.Apache Change RocksDB License 2017-07-15 16:11:23 -07:00
LICENSE.leveldb Add back the LevelDB license file 2017-07-16 18:42:18 -07:00
Makefile PinnableSlice move assignment 2017-10-12 18:28:24 -07:00
README.md Appveyor badge to show master branch 2016-07-26 13:54:08 -07:00
ROCKSDB_LITE.md Optimistic Transactions 2015-05-29 14:36:35 -07:00
TARGETS PinnableSlice move assignment 2017-10-12 18:28:24 -07:00
USERS.md Add LogDevice to USERS.md 2017-09-25 15:56:40 -07:00
Vagrantfile Update Vagrant file (test internal phabricator workflow) 2016-10-28 15:39:19 -07:00
WINDOWS_PORT.md Commit both PR and internal code review changes 2015-07-07 16:58:20 -07:00
appveyor.yml Add -DPORTABLE=1 to MSVC CI build 2017-08-31 16:42:48 -07:00
issue_template.md Add a template for issues 2017-09-29 11:41:28 -07:00
src.mk PinnableSlice move assignment 2017-10-12 18:28:24 -07:00
thirdparty.inc Enable cacheline_aligned_alloc() to allocate from jemalloc if enabled. 2017-10-27 13:27:12 -07:00

README.md

RocksDB: A Persistent Key-Value Store for Flash and RAM Storage

Build Status Build status

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/