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

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Dhruba Borthakur 7632fdb5cb Support taking a configurable number of files from the same level to compact in a single compaction run. ... Summary: The compaction process takes some files from LevelK and merges it into LevelK+1. The number of files it picks from LevelK was capped such a way that the total amount of data picked does not exceed the maxfilesize of that level. This essentially meant that only one file from LevelK is picked for a single compaction. For bulkloads, we would like to take many many file from LevelK and compact them using a single compaction run. This patch introduces a option called the 'source_compaction_factor' (similar to expanded_compaction_factor). It is a multiplier that is multiplied by the maxfilesize of that level to arrive at the limit that is used to throttle the number of source files from LevelK. For bulk loads, set source_compaction_factor to a very high number so that multiple files from the same level are picked for compaction in a single compaction. The default value of source_compaction_factor is 1, so that we can keep backward compatibilty with existing compaction semantics. Test Plan: make clean check Reviewers: emayanke, sheki Reviewed By: emayanke CC: leveldb Differential Revision: https://reviews.facebook.net/D6867		12 years ago
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c.h	Added bloom filter support.	12 years ago
cache.h	Print the block cache size in the LOG.	12 years ago
comparator.h	A number of fixes:	13 years ago
db.h	Add a readonly db	12 years ago
env.h	Merge branch 'master' into performance	12 years ago
filter_policy.h	Added bloom filter support.	12 years ago
iterator.h	A number of fixes:	13 years ago
options.h	Support taking a configurable number of files from the same level to compact in a single compaction run.	12 years ago
slice.h	Support for java access to leveldb via leveldbjni.	12 years ago
statistics.h	Metrics: record compaction drop's and bloom filter effectiveness	12 years ago
status.h	build shared libraries; updated version to 1.3; add Status accessors	12 years ago
table.h	Trigger read compaction only if seeks to storage are incurred.	12 years ago
table_builder.h	Allow having different compression algorithms on different levels.	12 years ago
write_batch.h	A number of fixes:	13 years ago