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| author | Jay Zhuang <zjay@fb.com> | 2022-07-14 21:49:34 -0700 |
|---|---|---|
| committer | Facebook GitHub Bot <facebook-github-bot@users.noreply.github.com> | 2022-07-14 21:49:34 -0700 |
| commit | a3acf2ef87e94a5877dd9561cd48f40d3075a3ee (patch) | |
| tree | 53ff311aae0f4ff9b000583233ecd32f24ff2566 /db/column_family.h | |
| parent | 66685d6aa184ec3905428fb5255cbd6ec20bf242 (diff) | |
Add seqno to time mapping (#10338)
Summary:
Which will be used for tiered storage to preclude hot data from
compacting to the cold tier (the last level).
Internally, adding seqno to time mapping. A periodic_task is scheduled
to record the current_seqno -> current_time in certain cadence. When
memtable flush, the mapping informaiton is stored in sstable property.
During compaction, the mapping information are merged and get the
approximate time of sequence number, which is used to determine if a key
is recently inserted or not and preclude it from the last level if it's
recently inserted (within the `preclude_last_level_data_seconds`).
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10338
Test Plan: CI
Reviewed By: siying
Differential Revision: D37810187
Pulled By: jay-zhuang
fbshipit-source-id: 6953be7a18a99de8b1cb3b162d712f79c2b4899f
Diffstat (limited to 'db/column_family.h')
| -rw-r--r-- | db/column_family.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/db/column_family.h b/db/column_family.h index a1d9060b3..91a825374 100644 --- a/db/column_family.h +++ b/db/column_family.h @@ -524,6 +524,8 @@ class ColumnFamilyData { return file_metadata_cache_res_mgr_; } + SequenceNumber GetFirstMemtableSequenceNumber() const; + static const uint32_t kDummyColumnFamilyDataId; // Keep track of whether the mempurge feature was ever used. |