Hui Xiao 05daa12332 Change compaction_readahead_size default value to 2MB (#11762) ... Summary: **Context/Summary:** After https://github.com/facebook/rocksdb/pull/11631, we rely on `compaction_readahead_size` for how much to read ahead for compaction read under non-direct IO case. https://github.com/facebook/rocksdb/pull/11658 therefore also sanitized 0 `compaction_readahead_size` to 2MB under non-direct IO, which is consistent with the existing sanitization with direct IO. However, this makes disabling compaction readahead impossible as well as add one more scenario to the inconsistent effects between `Options.compaction_readahead_size=0` during DB open and `SetDBOptions("compaction_readahead_size", "0")` . - `SetDBOptions("compaction_readahead_size", "0")` will disable compaction readahead as its logic never goes through sanitization above while `Options.compaction_readahead_size=0` will go through sanitization. Therefore we decided to do this PR. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11762 Test Plan: Modified existing UTs to cover this PR Reviewed By: ajkr Differential Revision: D48759560 Pulled By: hx235 fbshipit-source-id: b3f85e58bda362a6fa1dc26bd8a87aa0e171af79		2023-08-30 14:57:08 -07:00
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.gitkeep	Better management of unreleased HISTORY (#11481)	2023-05-30 16:42:49 -07:00
compaction_readahead_size_option_change.md	Change compaction_readahead_size default value to 2MB (#11762)	2023-08-30 14:57:08 -07:00