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

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Shobhit Dayal b45b1cde3e Feature for sampling and reporting compressibility (#4842) ... Summary: This is a feature to sample data-block compressibility and and report them as stats. 1 in N (tunable) blocks is sampled for compressibility using two algorithms: 1. lz4 or snappy for fast compression 2. zstd or zlib for slow but higher compression. The stats are reported to the caller as raw-bytes and compressed-bytes. The block continues to be compressed for storage using the specified CompressionType. The db_bench_tool how has a command line option for specifying the sampling rate. It's default value is 0 (no sampling). To test the overhead for a certain value, users can compare the performance of db_bench_tool, varying the sampling rate. It is unlikely to have a noticeable impact for high values like 20. Pull Request resolved: https://github.com/facebook/rocksdb/pull/4842 Differential Revision: D13629011 Pulled By: shobhitdayal fbshipit-source-id: 14ca668bcab6499b2a1734edf848eb62a4f4fafa		6 years ago
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blob_compaction_filter.cc	Apply modernize-use-override (2nd iteration)	6 years ago
blob_compaction_filter.h	Blob DB: Improve FIFO eviction	7 years ago
blob_db.cc	BlobDB: Remove GC interval option (#5044)	6 years ago
blob_db.h	BlobDB: Remove GC interval option (#5044)	6 years ago
blob_db_impl.cc	Feature for sampling and reporting compressibility (#4842)	6 years ago
blob_db_impl.h	Remove unused Blob WAL filter (#4896)	6 years ago
blob_db_impl_filesnapshot.cc	Support pragma once in all header files and cleanup some warnings (#4339)	6 years ago
blob_db_iterator.h	Change and clarify the relationship between Valid(), status() and Seek*() for all iterators. Also fix some bugs	7 years ago
blob_db_listener.h	Blob DB: Improve FIFO eviction	7 years ago
blob_db_test.cc	When closing BlobDB, should first wait for all background tasks (#5005)	6 years ago
blob_dump_tool.cc	Digest ZSTD compression dictionary once when writing SST file (#4849)	6 years ago
blob_dump_tool.h	Ensure delete[] and not delete is used on buffer_ (#4647)	6 years ago
blob_file.cc	BlobDB: handle IO error on read (#4410)	6 years ago
blob_file.h	BlobDB: handle IO error on read (#4410)	6 years ago
blob_index.h	Blob DB: Inline small values in base DB	7 years ago
blob_log_format.cc	utilities: Fix build failure with -Werror=maybe-uninitialized (#5074)	6 years ago
blob_log_format.h	BlobDB: use char array instead of string as buffer (#4662)	6 years ago
blob_log_reader.cc	BlobDB: use char array instead of string as buffer (#4662)	6 years ago
blob_log_reader.h	BlobDB: use char array instead of string as buffer (#4662)	6 years ago
blob_log_writer.cc	BlobDB: refactor DB open logic	7 years ago
blob_log_writer.h	BlobDB: refactor DB open logic	7 years ago