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author	Yanqin Jin <yanqin@fb.com>
	Sat, 18 Sep 2021 01:43:32 +0000 (18:43 -0700)
committer	Facebook GitHub Bot <facebook-github-bot@users.noreply.github.com>
	Sat, 18 Sep 2021 02:23:13 +0000 (19:23 -0700)
commit	b512f4bc766a8ea5dba271dc8df69984ccc27181
tree	d309ad159031f98a4813a21ef38764e827aa9cfa	tree \| snapshot
parent	ba48ff8303aad3bcfdae070191dfe587d2720d44	commit \| diff

Batch blob read IO for MultiGet (#8699)

Summary:
In batched `MultiGet()`, RocksDB batches blob read IO and uses `RandomAccessFileReader::MultiRead()`
to read the blobs instead of issuing multiple `Read()`.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8699

Test Plan:
```
make check
```

Reviewed By: ltamasi

Differential Revision: D31030861

Pulled By: riversand963

fbshipit-source-id: a0df6060cbfd54cff9515a4eee08807b1dbcb0c8

Unnamed repository; edit this file 'description' to name the repository.

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HISTORY.md		diff \| blob \| history
db/blob/blob_file_reader.cc		diff \| blob \| history
db/blob/blob_file_reader.h		diff \| blob \| history
db/blob/blob_file_reader_test.cc		diff \| blob \| history
db/blob/blob_index.h		diff \| blob \| history
db/blob/db_blob_basic_test.cc		diff \| blob \| history
db/db_impl/db_impl.cc		diff \| blob \| history
db/version_set.cc		diff \| blob \| history
db/version_set.h		diff \| blob \| history
table/multiget_context.h		diff \| blob \| history