Fix batch resend bug caused by prefetch limit - #454
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Retained look-ahead data could exhaust the donor prefetch budget while rebuilding a resent batch, preventing a required earlier blob from being loaded and causing each retry to fail at the same cursor, sticking the resync progress at the same point. Allow blobs preceding the retained prefetch frontier to bypass the bounded look-ahead budget, and cover the scenario with a focused regression test.
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## stable/v4.x #454 +/- ##
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koujl
marked this pull request as ready for review
July 30, 2026 01:49
JacksonYao287
approved these changes
Jul 30, 2026
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Retained look-ahead data could exhaust the donor prefetch budget while rebuilding a resent batch, preventing a required earlier blob from being loaded and causing each retry to fail at the same cursor, sticking the resync progress at the same point.
Allow blobs preceding the retained prefetch frontier to bypass the bounded look-ahead budget, and cover the scenario with a focused regression test.
Context: https://jirap.corp.ebay.com/browse/SDSTOR-24121