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Update History.md for VerifyFileChecksums API supporting blob file (#7995) 

Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/7995

Reviewed By: ltamasi

Differential Revision: D26625766

Pulled By: akankshamahajan15

fbshipit-source-id: d83c9e77695f4193da979b1ce7103b43bc1dd46c
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Akanksha Mahajan 2021-02-24 10:23:20 -08:00 committed by Facebook GitHub Bot
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@ -5,6 +5,7 @@
### Public API change
* Add a new option BlockBasedTableOptions::max_auto_readahead_size. RocksDB does auto-readahead for iterators on noticing more than two reads for a table file if user doesn't provide readahead_size. The readahead starts at 8KB and doubles on every additional read upto max_auto_readahead_size and now max_auto_readahead_size can be configured dynamically as well. Found that 256 KB readahead size provides the best performance, based on experiments, for auto readahead. Experiment data is in PR #3282. If value is set 0 then no automatic prefetching will be done by rocksdb. Also changing the value will only affect files opened after the change.
* Add suppport to extend DB::VerifyFileChecksums API to also verify blob files checksum.
## 6.18.0 (02/19/2021)
### Behavior Changes