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Gang Liao c987eb4712 Eliminate the copying of blobs when serving reads from the cache (#10297) 
Summary:
The blob cache enables an optimization on the read path: when a blob is found in the cache, we can avoid copying it into the buffer provided by the application. Instead, we can simply transfer ownership of the cache handle to the target `PinnableSlice`. (Note: this relies on the `Cleanable` interface, which is implemented by `PinnableSlice`.)

This has the potential to save a lot of CPU, especially with large blob values.

This task is a part of https://github.com/facebook/rocksdb/issues/10156

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10297

Reviewed By: riversand963

Differential Revision: D37640311

Pulled By: gangliao

fbshipit-source-id: 92de0e35cc703d06c87c5c1861cc2899ec52234a
 		2022-07-06 18:57:29 -07:00
..
blob_constants.h Move BlobDB related files under db/ to db/blob/ (#6519) 2020-03-12 11:00:56 -07:00
blob_counting_iterator.h Log the amount of blob garbage generated by compactions in the MANIFEST (#8450) 2021-06-24 16:11:56 -07:00
blob_counting_iterator_test.cc Cleanup multiple implementations of VectorIterator (#8901) 2021-10-06 07:48:31 -07:00
blob_fetcher.cc Support readahead during compaction for blob files (#9187) 2021-11-19 17:53:47 -08:00
blob_fetcher.h Support readahead during compaction for blob files (#9187) 2021-11-19 17:53:47 -08:00
blob_file_addition.cc Print blob file checksums as hex (#8437) 2021-06-22 09:49:44 -07:00
blob_file_addition.h Move BlobDB related files under db/ to db/blob/ (#6519) 2020-03-12 11:00:56 -07:00
blob_file_addition_test.cc Print blob file checksums as hex (#8437) 2021-06-22 09:49:44 -07:00
blob_file_builder.cc Expose blob file information through the EventListener interface (#8675) 2021-09-16 17:23:36 -07:00
blob_file_builder.h Expose blob file information through the EventListener interface (#8675) 2021-09-16 17:23:36 -07:00
blob_file_builder_test.cc Make SystemClock into a Customizable Class (#8636) 2021-09-21 09:23:48 -07:00
blob_file_cache.cc Rename ImmutableOptions variables (#8409) 2021-06-16 16:51:38 -07:00
blob_file_cache.h Rename ImmutableOptions variables (#8409) 2021-06-16 16:51:38 -07:00
blob_file_cache_test.cc Have Cache use Status::MemoryLimit (#10262) 2022-07-06 14:41:46 -07:00
blob_file_completion_callback.h Fix LITE mode builds on MacOs (#8981) 2021-10-04 05:30:26 -07:00
blob_file_garbage.cc Move BlobDB related files under db/ to db/blob/ (#6519) 2020-03-12 11:00:56 -07:00
blob_file_garbage.h Move BlobDB related files under db/ to db/blob/ (#6519) 2020-03-12 11:00:56 -07:00
blob_file_garbage_test.cc Move BlobDB related files under db/ to db/blob/ (#6519) 2020-03-12 11:00:56 -07:00
blob_file_meta.cc Add BlobMetaData retrieval methods (#8273) 2021-06-28 08:13:29 -07:00
blob_file_meta.h Add BlobMetaData retrieval methods (#8273) 2021-06-28 08:13:29 -07:00
blob_file_reader.cc Enable blob caching for MultiGetBlob in RocksDB (#10272) 2022-06-30 13:24:35 -07:00
blob_file_reader.h Enable blob caching for MultiGetBlob in RocksDB (#10272) 2022-06-30 13:24:35 -07:00
blob_file_reader_test.cc Enable blob caching for MultiGetBlob in RocksDB (#10272) 2022-06-30 13:24:35 -07:00
blob_garbage_meter.cc Add a class for measuring the amount of garbage generated during compaction (#8426) 2021-06-21 22:25:30 -07:00
blob_garbage_meter.h Add a class for measuring the amount of garbage generated during compaction (#8426) 2021-06-21 22:25:30 -07:00
blob_garbage_meter_test.cc Add a class for measuring the amount of garbage generated during compaction (#8426) 2021-06-21 22:25:30 -07:00
blob_index.h Remove own ToString() (#9955) 2022-05-06 13:03:58 -07:00
blob_log_format.cc Introduce BlobFileCache and add support for blob files to Get() (#7540) 2020-10-15 13:04:47 -07:00
blob_log_format.h Add a class for measuring the amount of garbage generated during compaction (#8426) 2021-06-21 22:25:30 -07:00
blob_log_sequential_reader.cc Add rate limiter priority to ReadOptions (#9424) 2022-02-16 23:18:14 -08:00
blob_log_sequential_reader.h Fix a issue with initializing blob header buffer (#8537) 2021-08-02 17:15:06 -07:00
blob_log_writer.cc Use SystemClock* instead of std::shared_ptr<SystemClock> in lower level routines (#8033) 2021-03-15 04:34:11 -07:00
blob_log_writer.h Use SystemClock* instead of std::shared_ptr<SystemClock> in lower level routines (#8033) 2021-03-15 04:34:11 -07:00
blob_read_request.h Enable blob caching for MultiGetBlob in RocksDB (#10272) 2022-06-30 13:24:35 -07:00
blob_source.cc Eliminate the copying of blobs when serving reads from the cache (#10297) 2022-07-06 18:57:29 -07:00
blob_source.h Eliminate the copying of blobs when serving reads from the cache (#10297) 2022-07-06 18:57:29 -07:00
blob_source_test.cc Enable blob caching for MultiGetBlob in RocksDB (#10272) 2022-06-30 13:24:35 -07:00
db_blob_basic_test.cc Enable blob caching for MultiGetBlob in RocksDB (#10272) 2022-06-30 13:24:35 -07:00
db_blob_compaction_test.cc Fix LITE build (#10106) 2022-06-02 23:42:41 -07:00
db_blob_corruption_test.cc Enable a few unit tests to use custom Env objects (#9087) 2021-11-08 11:05:59 -08:00
db_blob_index_test.cc Remove own ToString() (#9955) 2022-05-06 13:03:58 -07:00
prefetch_buffer_collection.cc Support readahead during compaction for blob files (#9187) 2021-11-19 17:53:47 -08:00
prefetch_buffer_collection.h Support readahead during compaction for blob files (#9187) 2021-11-19 17:53:47 -08:00