feat: Implementing cross-segment read/write for WAL based on local disk #1556
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jiacai2050
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Sep 2, 2024
jiacai2050
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Sep 4, 2024
jiacai2050
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Sep 14, 2024
## Rationale Currently the WAL based on the local disk does not support the delete function. This PR implements that functionality. This is a follow-up task of #1552 and #1556. ## Detailed Changes 1. For each `Segment`, add a hashmap to record the minimum and maximum sequence numbers of all tables within that segment. During `delete` and `write` operations, this hashmap will be updated. During read operations, logs will be filtered based on this hashmap. 2. During the `delete` operation, based on the aforementioned hashmap, if all logs of all tables in a read-only segment (a segment that is not currently being written to) are marked as deleted, the segment file will be physically deleted from the disk. ## Test Plan Unit test, TSBS and running a script locally that repeatedly inserts data, forcibly kills, and restarts the database process to test persistence.
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Rationale
Improving WAL based on local disk.
This is a follow-up task for #1552.
Detailed Changes
MultiSegmentLogIteratorto enable cross-segment reading.Test Plan
Unit test.