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jeremyhi
e4872ec1a2
* feat(log-store): collect object store WAL objects below a persisted reclaim boundary Every object header carries a reclaim boundary: every object below it was fully flushed when the object was sealed. The writer computes the boundary from the catalog and the obsolete watermarks after every obsolete and every indexed object, and stamps it on every sealed object and on the start object. The boundary of the last indexed object permits deletion: every present object below it, indexed, listed by recovery off the chain, or left by a failed batch, is deleted in the background, at most four at a time. Recovery judges every candidate with its own boundary: a link to a predecessor below it holds whether or not the predecessor is present, and the chain stops there. A read that listed an object before it was collected skips it instead of failing. The header grows from 46 to 54 bytes; the format version stays 1. Signed-off-by: jeremyhi <fengjiachun@gmail.com> * perf(log-store): scan the reclaim boundary from the previous boundary The boundary was recomputed by scanning every region's indexed objects from the first one, so the flushed objects of busy regions were scanned again on every indexed object while another region held the boundary. Scan the objects in sequence order from the previous boundary instead and stop at the first one holding a live segment. Watermarks never move down and a region first appears above the boundary, so the result is the same and an object is not scanned again once the boundary passed it. Signed-off-by: jeremyhi <fengjiachun@gmail.com> * test(log-store): name the parked operation helpers after both their uses Signed-off-by: jeremyhi <fengjiachun@gmail.com> --------- Signed-off-by: jeremyhi <fengjiachun@gmail.com>