fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph

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Dhruba Borthakur 47c4191fe8 Reduce write amplification by merging files in L0 back into L0 ... Summary: There is a new option called hybrid_mode which, when switched on, causes HBase style compactions. Files from L0 are compacted back into L0. This meat of this compaction algorithm is in PickCompactionHybrid(). All files reside in L0. That means all files have overlapping keys. Each file has a time-bound, i.e. each file contains a range of keys that were inserted around the same time. The start-seqno and the end-seqno refers to the timeframe when these keys were inserted. Files that have contiguous seqno are compacted together into a larger file. All files are ordered from most recent to the oldest. The current compaction algorithm starts to look for candidate files starting from the most recent file. It continues to add more files to the same compaction run as long as the sum of the files chosen till now is smaller than the next candidate file size. This logic needs to be debated and validated. The above logic should reduce write amplification to a large extent... will publish numbers shortly. Test Plan: dbstress runs for 6 hours with no data corruption (tested so far). Differential Revision: https://reviews.facebook.net/D11289		12 years ago
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c.h	Fix poor error on num_levels mismatch and few other minor improvements	12 years ago
cache.h	Codemod NULL to nullptr	12 years ago
compaction_filter.h	[RocksDB] Cleanup compaction filter to use a class interface, instead of function pointer and additional context pointer.	12 years ago
comparator.h	A number of fixes:	13 years ago
db.h	Very basic Multiget and simple test cases.	12 years ago
env.h	[RocksDB] Option for incremental sync	12 years ago
filter_policy.h	Added bloom filter support.	13 years ago
iterator.h	A number of fixes:	13 years ago
ldb_tool.h	[RocksDB] Expose LDB functioanality as a library call - clients can build their own LDB binary with additional options	12 years ago
merge_operator.h	[Rocksdb] Support Merge operation in rocksdb	12 years ago
options.h	Reduce write amplification by merging files in L0 back into L0	12 years ago
slice.h	manifest_dump: Add --hex=1 option	12 years ago
statistics.h	Reduce write amplification by merging files in L0 back into L0	12 years ago
status.h	[Rocksdb] Support Merge operation in rocksdb	12 years ago
table_builder.h	Fix all the lint errors.	12 years ago
transaction_log_iterator.h	Do not allow Transaction Log Iterator to fall ahead when writer is writing the same file	12 years ago
types.h	GetUpdatesSince API to enable replication.	12 years ago
write_batch.h	[RocksDB] Expose count for WriteBatch	12 years ago