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Chris Lu
213b6c3107
* fix(mount): count manifest sizes in merge condition to prevent manifest accumulation shouldMergeChunks only counted non-manifest chunk sizes toward the bloat threshold, so overlapping manifests accumulated undetected across flush cycles. During sustained random writes (e.g. fio), each metadata flush compacts non-manifest chunks and may group them into a new manifest via MaybeManifestize, while carrying forward all existing manifests. Since the merge condition only checked non-manifest totals against 2x file size, the growing pile of redundant manifests never triggered a merge. In a real workload: 4 GB file, 25 manifests each covering ~4 GB (107 GB manifest data on volume servers), but shouldMergeChunks saw only 4.2 GB of non-manifest chunks vs the 8.6 GB threshold -- no merge. Fix: include manifest coverage sizes in totalChunkSize. This correctly detects the 111 GB total vs 8.6 GB threshold and triggers the merge, which re-reads the file as clean chunks and lets the filer's MinusChunks (which resolves manifests) garbage-collect all redundant sub-chunks. * test(mount,filer): add manifest chunk correctness tests Filer-level tests (filechunk_manifest_test.go): - TestManifestRoundTripPreservesChunks: create -> serialize -> deserialize preserves fileId, offset, size, and timestamp for all sub-chunks - TestCompactResolvedOverlappingManifests: two manifests covering the same range, older sub-chunks correctly identified as garbage after compaction - TestDoMinusChunksWithResolvedManifests: old manifest sub-chunks detected as garbage when compared against new clean chunks (mirrors filer cleanup) - TestManifestizeSmallBatchWithRemainder: batch=3 with 7 chunks produces 2 manifests + 1 remainder, all data recoverable after resolve - TestCompactMultipleOverlappingManifestGenerations: 5 generations of full-file manifests, compaction keeps only the newest generation - TestManifestBloatDetection: with N overlapping manifests, merge triggers at N >= 2 (stored > 2x file size) Mount-level test (weedfs_file_sync_test.go): - TestFlushCycleManifestAccumulation: simulates the flushMetadataToFiler pipeline over multiple cycles with a small manifest batch (5 chunks). Verifies merge triggers at cycle 2 when accumulated manifests exceed the 2x threshold. Uses SeparateManifestChunks + CompactFileChunks + shouldMergeChunks to mirror the real code path.