branch-3.1: [fix](mow) reduce mow delete bitmap count: agg and remove delete bitmap of pre rowsets when cu compaction (#49383)#52204
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…ap of pre rowsets when cu compaction (apache#49383) This PR reduce delete bitmap count of mow tables 1. when do cumulative compaction [start_rowset, end_rowset], which version is [start_version, end_version] 2. agg pre_rowsets'(version less than start_version) delete bitmap between [start_version, end_version] to end_version, 3. when all of the rowsets of [start_rowset, end_rowset] are deleted, delete pre rowsets' delete bitmap between [start_version, end_version). suppose the rowset and delete bitmap layout is: ``` [rowset_id]: [delete bitmap] r1-3: v6, v7, v8, v9 r4-6: v7, v8, v9 r7: v8, v9 r8: v9 r9: ``` if do cumulative compaction for {r7, r8, r9} before this pr, the delete bitmap layout is (there is 7 delete bitmap left): ``` [rowset_id]: [delete bitmap] r1-3: v6, v7, v8, v9 r4-6: v7, v8, v9 r7-9: ``` after this pr (there is 3 delete bitmap left): ``` [rowset_id]: [delete bitmap] r1-3: v6, new_v9 // new_v9 is agged by the previous v7, v8, v9 of r1-3 r4-6: new_v9 // new_v9 is agged by the previous v7, v8, v9 of r4-6 r7-9: ``` 1. agged when delete stale rowset path 2. removed when delete unused rowsets `save_meta` to store delete bitmap after remove unused rowsets related delete bitmap 1. agged when delete stale rowset path 2. removed when delete unused rowsets 1. agged when finish compaction 2. send `update_delete_bitmap` to ms to modify and remove pre rowsets delete bitmap None
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TPC-H: Total hot run time: 39765 ms |
TPC-DS: Total hot run time: 196807 ms |
ClickBench: Total hot run time: 30.96 s |
morrySnow
approved these changes
Jun 24, 2025
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pick #49383