feat(storage): Splitting table change log from HummockVersion on CN side #20050
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…nto li0k/storage_divide_table_change_log
Li0k
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…nto li0k/storage_divide_table_change_log
Li0k
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zwang28
reviewed
Jan 8, 2025
| guard: Arc::new(PinnedVersionGuard::new( | ||
| version_id, | ||
| self.guard.pinned_version_manager_tx.clone(), | ||
| )), | ||
| table_change_log: Arc::new(RwLock::new(t)), | ||
| version: Arc::new(LocalHummockVersion::from(version)), |
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I just want to leave a note here.
This LocalHummockVersion::from is an addtional HummockVersion conversion introduced by this PR. However I don't think it will have significant performance implications, as it primarily involves move semantics.
| let change_log = { | ||
| let table_change_logs = version.table_change_log().read(); | ||
| if let Some(change_log) = table_change_logs.get(&options.table_id) { | ||
| change_log.filter_epoch(epoch_range).cloned().collect_vec() |
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This cloned() is an additional cost introduced in this PR.
If multiple iter_log are running simultaneously, will the memory usage be substantial?
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cc @wenym1 , suggests that iter_log is executed less frequently and that this clone is acceptable.
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What's changed and what's your intention?
This PR optimize clone behavior on the CN side. Split the table change log from the hummock version to avoid copying all table change logs at each version delta.
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