refactor(backfill): Backfill Plugin Major Refactor And Improvements#2006

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AlfredoG87 wants to merge 69 commits intomainfrom

backfill-improvements2

Commits on Jan 6, 2026

refactor(backfill): add gap classification with GapType and TypedGap
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refactor(backfill): implement dual scheduler architecture
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refactor(backfill): update plugin for dual scheduler orchestration
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refactor(backfill): consolidate fetcher and remove BackfillGrpcClient
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test(backfill): add timeout annotations to prevent test hangs
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docs(backfill): update documentation for dual scheduler architecture
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stylefix
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Restoring Persistence Backpressure to blocks by Encapsulating that logic into BackfillPersistenceAwaiter class.
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Added and improved UT coverage for new components
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further UT improvements and deduplication
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further UT improvements and deduplication
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Codacy and spotless stylefix recommendations
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- Exposed Configuration for webClient HTTP2 tuning parameters, and set recommended default for high-throughput.
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Missing Tests for PriorityHealthBasedStrategy class and some nits around that class and its docs
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Added mergeContiguousRanges() in BackfillFetcher.java
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stylefix
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codacy nits and improved comments on TestBlockNodeServer class
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Updated Documentation to reflect new Architecture Design
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Improved UTs for BackfillFetcherTest and GapDetectorTest, increasing coverage and scenarios.
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Further UT improvements and Logs QOL improvements on Messaging Facility
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increasing timeout on test to make it more stable since it covers many scenarios
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added validation constants for HTTP2 Tuning Config parameters for BlockNodeClient used on Backfill Jobs.
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added validation constants for HTTP2 Tuning Config parameters for BlockNodeClient used on Backfill Jobs. and added missing java doc params descriptions
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- Used MetricsHolder pattern to simplify constructors and testing, also reduced complexity by getting rid of the metrics callback interface.
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removed the applyJitter Method, since we don't have that many concurrent tasks that could overwhelm the target if they all delay and become available at the same time.
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added how the health score system works to the design doc
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extracted mergeContiguousRanges to be part of LongRange class itself.
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- improved java doc wording
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- Added comment for Status Enum ordinal brittleness
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- improved variable name to be more explicit hwm to highWaterMark
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micro optimization to avoid parsing blockHeader twice on backfill processing.
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- Config readability nit
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style-fix change after rebase with main.
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codacy suggestion
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Fixed timeout issues found during remote e2e tests, and then digged deeper to see other timeout scenarios.
AlfredoG87
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Commits on Jan 7, 2026

Commits on Jan 9, 2026

Commits on Jan 13, 2026