Update HISTORY.md for 7.8 release (#10844)

Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/10844

Reviewed By: ajkr

Differential Revision: D40592956

Pulled By: akankshamahajan15

fbshipit-source-id: 6656f4bc5faa30fa7882bf44155f7931895590e2
main
akankshamahajan 2 years ago committed by Facebook GitHub Bot
parent f726d29a82
commit 9a55e5da17
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      HISTORY.md

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# Rocksdb Change Log # Rocksdb Change Log
## Unreleased ## 7.8.0 (10/22/2022)
### New Features ### New Features
* `DeleteRange()` now supports user-defined timestamp. * `DeleteRange()` now supports user-defined timestamp.
* Provide support for async_io with tailing iterators when ReadOptions.tailing is enabled during scans. * Provide support for async_io with tailing iterators when ReadOptions.tailing is enabled during scans.
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* Note that during the migration phase, the file purge order will only be an approximation of "FIFO" as files in lower-level might sometime contain newer keys than files in upper-level. * Note that during the migration phase, the file purge order will only be an approximation of "FIFO" as files in lower-level might sometime contain newer keys than files in upper-level.
* Added an option `ignore_max_compaction_bytes_for_input` to ignore max_compaction_bytes limit when adding files to be compacted from input level. This should help reduce write amplification. The option is enabled by default. * Added an option `ignore_max_compaction_bytes_for_input` to ignore max_compaction_bytes limit when adding files to be compacted from input level. This should help reduce write amplification. The option is enabled by default.
* Tiered Storage: allow data moving up from the last level even if it's a last level only compaction, as long as the penultimate level is empty. * Tiered Storage: allow data moving up from the last level even if it's a last level only compaction, as long as the penultimate level is empty.
* Add a new option IOOptions.do_not_recurse that can be used by underlying file systems to skip recursing through sub directories and list only files in GetChildren API.
* Add option `preserve_internal_time_seconds` to preserve the time information for the latest data. Which can be used to determine the age of data when `preclude_last_level_data_seconds` is enabled. The time information is attached with SST in table property `rocksdb.seqno.time.map` which can be parsed by tool ldb or sst_dump.
### Bug Fixes ### Bug Fixes
* Fix a bug in io_uring_prep_cancel in AbortIO API for posix which expects sqe->addr to match with read request submitted and wrong paramter was being passed. * Fix a bug in io_uring_prep_cancel in AbortIO API for posix which expects sqe->addr to match with read request submitted and wrong paramter was being passed.
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* Improve RoundRobin TTL compaction, which is going to be the same as normal RoundRobin compaction to move the compaction cursor. * Improve RoundRobin TTL compaction, which is going to be the same as normal RoundRobin compaction to move the compaction cursor.
* Fix a small CPU regression caused by a change that UserComparatorWrapper was made Customizable, because Customizable itself has small CPU overhead for initialization. * Fix a small CPU regression caused by a change that UserComparatorWrapper was made Customizable, because Customizable itself has small CPU overhead for initialization.
### New Features
* Add a new option IOOptions.do_not_recurse that can be used by underlying file systems to skip recursing through sub directories and list only files in GetChildren API.
* Add option `preserve_internal_time_seconds` to preserve the time information for the latest data. Which can be used to determine the age of data when `preclude_last_level_data_seconds` is enabled. The time information is attached with SST in table property `rocksdb.seqno.time.map` which can be parsed by tool ldb or sst_dump.
### Behavior Changes ### Behavior Changes
* Sanitize min_write_buffer_number_to_merge to 1 if atomic flush is enabled to prevent unexpected data loss when WAL is disabled in a multi-column-family setting (#10773). * Sanitize min_write_buffer_number_to_merge to 1 if atomic flush is enabled to prevent unexpected data loss when WAL is disabled in a multi-column-family setting (#10773).

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