refactor: use high watermark to finish backfill faster #18342
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| @@ -21,7 +44,7 @@ create source s0 (v1 int, v2 varchar) with ( | |||
| scan.startup.mode = 'earliest' | |||
| ) FORMAT PLAIN ENCODE JSON; | |||
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| query I | |||
| query ? | |||
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When do we need to use ? instead of I ?
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currently sqllogictest --override will produce ?. Actually the character doesn't have any meaning now, any character will pass test..
| system ok | ||
| internal_table.mjs --name s0 --type source | ||
| ---- | ||
| (empty) | ||
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| # offset 0 must be backfilled, not from upstream. | ||
| # SourceBackfill starts from offset 0, with backfill_info: HasDataToBackfill { latest_offset: "0" } (decided by kafka high watermark). |
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In this case, what will the high watermark value be?
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What's changed and what's your intention?
step 2 & 3 of #18299, see there for the motivation and a state diagram of the new design.
Checklist
./risedev check(or alias,./risedev c)Documentation
Release note
If this PR includes changes that directly affect users or other significant modifications relevant to the community, kindly draft a release note to provide a concise summary of these changes. Please prioritize highlighting the impact these changes will have on users.