3 Commits

Include renames

Author	SHA1	Message	Date
Chris Lu	a7d5443125	ec: confirm a surviving copy before deleting a duplicate EC shard (#10719) ... * ec: confirm a surviving copy before deleting a duplicate EC shard The dedup phase of EC balancing removes a shard it believes exists elsewhere. It copies nothing first, so the shard surviving on another node is the only thing that makes the delete safe -- and it took the plan's word for that. The plan is built from the master's topology, which can name a location that holds nothing: such a server answers "CopyFile not found ec volume id N" when something later tries to read the shard there. A shard listed on a phantom location and on a real one looks duplicated, so dedup deletes one of them. When it picks the real one the last copy is gone, and the job reports success -- the loss only surfaces later, as a rebuild that cannot assemble enough shards. The move phase already refuses to work on trust: it verifies the shard registered on the destination before removing the source. Dedup now holds to the same standard. The planner records which node it chose to keep, and both executors -- the worker task and the shell's ec.balance -- confirm that node really holds the shard before deleting. A keep node that cannot be queried is unknown rather than confirmed, and blocks the delete. Tests drive the destructive path against an in-process volume server that tracks what is actually on disk separately from what the plan claims, which is the distinction the bug turns on. Without the guard, two of them fail by deleting the only copy and returning success. * ec: check the collection and bound the wait when confirming a survivor Two gaps in the dedup survivor check. The inventory RPC is keyed by volume id alone, so a server holding the same number for a different collection answers "yes, I have that shard" to a question about this one. Accepting that deletes the last real copy on the strength of an unrelated volume. The response already carries the collection, so verify against it rather than widening the RPC. The shell path also queried on a background context, so a keep node that accepts the connection but never answers would hang the whole balance run instead of reporting that the survivor could not be confirmed. Bound it. The check moves into VerifyShardsOnServer next to the existing helper, shared by both executors, so the two paths cannot drift.	2026-08-11 20:15:34 -07:00
Chris Lu	34f9b91d69	fix(storage): never let an empty .dat delete healthy distributed EC shards (#9930) ... * fix(storage): never let an empty .dat delete healthy distributed EC shards A leftover empty .dat stub (a phantom from the pre-fix loader; zero needles) next to a distributed EC volume's local shards made startup classify the volume as an interrupted local encode: validateEcVolume requires >= dataShards local shards when a .dat is present, fails with the 1-2 shards a distributed volume keeps per disk, and the cleanup deletes those shards -- the only copies of that part of the volume. Repeated across restart waves this destroys enough shards cluster-wide to make the volume unrecoverable. Go: - loadExistingVolume: hoist the empty-stub sweep above the EC presence checks. Previously the .vif-next-to-.ecx guard returned before the sweep ever ran, so exactly the dangerous layout (stub + .ecx + local shards) kept its stub and then lost its shards in loadAllEcShards. - validateEcVolume / checkDatFileExists: treat a .dat <= a superblock (zero needles) as absent. An empty .dat cannot be the encode source, so it must never gate shard deletion; this also covers stubs without a .vif, which the sweep cannot prove are EC leftovers. Rust mirror (seaweed-volume): the same gate in validate_ec_volume and check_dat_file_exists (the Rust sweep already ran before validation); the volume-load skip keeps a plain existence check so fresh, needle-less volumes still load. Regression tests in Go and Rust reproduce the production layout (a zero-byte .dat beside .ecx/.ecj and two shards of a 10+4 volume, with and without a .vif) and fail without the fix with the shards deleted. * fix(ec): gate source volume deletion on a recoverable shard set After EC encode, the shell command and the (plugin) worker task refused to delete the source volume unless every shard was present, and aborted otherwise -- leaving the source .dat next to live shards, exactly the mixed state the startup cleanup mishandles. Replace the full-set requirement with a recoverability gate shared by both callers (RequireRecoverableShardSet): deleting a non-empty source .dat requires at least dataShards distinct shards cluster-wide. Below that the source is kept and the encode fails as before. A degraded but recoverable set (>= dataShards, < total) now proceeds with a warning instead of aborting: the missing shards can be rebuilt from the survivors, while keeping the source would preserve the dangerous mixed state. Empty stub replicas are still swept unguarded (OnlyEmpty) -- an empty .dat has nothing to lose. dataShards/totalShards stay parameters so enterprise custom EC ratios share the helper verbatim. * test(ec): use recoverable shard verification gate	2026-06-11 20:26:20 -07:00
Chris Lu	3a8389cd68	fix(ec): verify full shard set before deleting source volume (#9490) (#9493) ... * fix(ec): verify full shard set before deleting source volume (#9490) Before this change, both the worker EC task and the shell ec.encode command would delete the source .dat as soon as MountEcShards returned — even if distribute/mount failed partway, leaving fewer than 14 shards in the cluster. The deletion was logged at V(2), so by the time someone noticed missing data the only trace was a 0-byte .dat synthesized by disk_location at next restart. - Worker path adds Step 6: poll VolumeEcShardsInfo on every destination, union the bitmaps, and refuse to call deleteOriginalVolume unless all TotalShardsCount distinct shard ids are observed. A failed gate leaves the source readonly so the next detection scan can retry. - Shell ec.encode adds the same gate after EcBalance, walking the master topology with collectEcNodeShardsInfo. - VolumeDelete RPC success and .dat/.idx unlinks now log at V(0) so any source destruction is traceable in default-verbosity production logs. The EC-balance-vs-in-flight-encode race is intentionally left for a follow-up; balance should refuse to move shards for a volume whose encode job is not in Completed state. * fix(ec): trim doc comments on the new shard-verification path Drop WHAT-describing godoc on freshly added helpers; keep only the WHY notes (query-error policy in VerifyShardsAcrossServers, the #9490 reference at the call sites). * fix(ec): drop issue-number anchors from new comments Issue references age poorly — the why behind each comment already stands on its own. * fix(ec): parametrize RequireFullShardSet on totalShards Take totalShards as an argument instead of reading the package-level TotalShardsCount constant. The OSS callers continue to pass 14, but the helper is now usable with any DataShards+ParityShards ratio. * test(plugin_workers): make fake volume server respond to VolumeEcShardsInfo The new pre-delete verification gate calls VolumeEcShardsInfo on every destination after mount, and the fake server's UnimplementedVolumeServer returns Unimplemented — the verifier read that as zero shards on every node and aborted source deletion. Build the response from recorded mount requests so the integration test exercises the gate end-to-end. * fix(rust/volume): log .dat/.idx unlink with size in remove_volume_files Mirror the Go-side change in weed/storage/volume_write.go: stat each file before removing and emit an info-level log for .dat/.idx so a destructive call is always traceable. The OSS Rust crate previously unlinked them silently. * fix(ec/decode): verify regenerated .dat before deleting EC shards After mountDecodedVolume succeeds, the previous code immediately unmounts and deletes every EC shard. A silent failure in generate or mount could leave the cluster with neither shards nor a valid normal volume. Probe ReadVolumeFileStatus on the target and refuse to proceed if dat or idx is 0 bytes. Also make the fake volume server's VolumeEcShardsInfo reflect whichever shard files exist on disk (seeded for tests as well as mounted via RPC), so the new gate can be exercised end-to-end. * fix(ec): address PR review nits in verification + fake server - Drop unused ServerShardInventory.Sizes field. - Skip shard ids >= MaxShardCount before bitmap Set so the ShardBits bound is explicit (Set already no-ops on overflow, this is for clarity). - Nil-guard the fake server's VolumeEcShardsInfo so a malformed call doesn't panic the test process.	2026-05-13 19:29:24 -07:00