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Update HISTORY.md with new use of ZSTD_CDict (#4901)

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Summary:
Mention feature introduced by #4849 in HISTORY.md.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4901

Differential Revision: D13746430

Pulled By: ajkr

fbshipit-source-id: f7bdea6f0522ed55428cbc521f8a9f3cd0002d4e
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Andrew Kryczka 6 years ago committed by Facebook Github Bot
parent 01013ae766
commit 16a5ac5b69
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HISTORY.md
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@ -4,6 +4,7 @@
* Enabled checkpoint on readonly db (DBImplReadOnly). * Enabled checkpoint on readonly db (DBImplReadOnly).
* Make DB ignore dropped column families while committing results of atomic flush. * Make DB ignore dropped column families while committing results of atomic flush.
* RocksDB may choose to preopen some files even if options.max_open_files != -1. This may make DB open slightly longer. * RocksDB may choose to preopen some files even if options.max_open_files != -1. This may make DB open slightly longer.
* For users of dictionary compression with ZSTD v0.7.0+, we now reuse the same digested dictionary when compressing each of an SST file's data blocks for faster compression speeds.
### Public API Change ### Public API Change
* Transaction::GetForUpdate is extended with a do_validate parameter with default value of true. If false it skips validating the snapshot before doing the read. Similarly ::Merge, ::Put, ::Delete, and ::SingleDelete are extended with assume_tracked with default value of false. If true it indicates that call is assumed to be after a ::GetForUpdate. * Transaction::GetForUpdate is extended with a do_validate parameter with default value of true. If false it skips validating the snapshot before doing the read. Similarly ::Merge, ::Put, ::Delete, and ::SingleDelete are extended with assume_tracked with default value of false. If true it indicates that call is assumed to be after a ::GetForUpdate.

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