Add tombstone/deleting safety net for stream deletion (#1763) - #1768
Add tombstone/deleting safety net for stream deletion (#1763)#1768prabhaks wants to merge 4 commits into
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Lays groundwork for background stream deletion: a durable tombstone marker outside the deleted prefix, an in-memory `deleting` flag on resident streams, and guards in the reload/query/info-endpoint code paths that reject a stream once either is set. Purely additive, no behavior change to the current delete handlers, since nothing yet sets a tombstone or the flag. Prepares for the actual async-delete rewrite in a follow-up PR.
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Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. WalkthroughThe change adds tombstone discovery, transient deletion state, lazy-reload protection, and HTTP guards. Ingestion uses a caller-provided log source. Query time parsing uses ChangesStream deletion handling
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Other Suggested reviewers: Merge Risk: 🟡 Moderate · up to Deletion safeguards can still permit a narrow race where writes or resident-stream access continue after deletion begins. Resolve or explicitly accept these lifecycle gaps before merging asynchronous deletion behavior. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
A rabbit marks the stream for sleep. Comment |
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Inline comments:
In `@src/parseable/mod.rs`:
- Around line 476-480: Update check_or_load_stream and
create_stream_and_schema_from_storage so tombstone validation applies to
resident streams and is rechecked under stream deletion/registration
coordination, preventing concurrent tombstones from being missed during loading
or registration. Preserve rejection of tombstoned streams without requiring
deleting to be set, and add a test covering a resident stream whose tombstone is
written before the access attempt.
In `@src/parseable/streams.rs`:
- Around line 1355-1364: Coordinate Stream::mark_deleting and Stream::push using
the same lock so deletion cannot race with writes. Have push check the deletion
state at the write boundary and return the established deletion error without
modifying memory or disk; avoid relying on a separate unsynchronized boolean
check, while preserving the existing mark_deleting semantics.
- Around line 1355-1364: Update Stream::set_metadata to preserve an already-true
deleting flag when replacing LogStreamMetadata, ensuring later reloads with
deleting false cannot clear the monotonic state observed by is_deleting and
mark_deleting.
In `@src/storage/localfs.rs`:
- Line 537: Update list_old_streams to exclude TOMBSTONE_ROOT_DIRECTORY from the
directories it processes, preventing dir_with_old_stream from treating the
tombstones directory as an old stream. Add or update tests covering both
list_old_streams and dir_with_old_stream behavior with .tombstones present.
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src/handlers/http/ingest.rssrc/handlers/http/logstream.rssrc/handlers/http/modal/utils/ingest_utils.rssrc/handlers/http/query.rssrc/metadata.rssrc/metastore/metastores/object_store_metastore.rssrc/migration/mod.rssrc/parseable/mod.rssrc/parseable/streams.rssrc/storage/localfs.rssrc/storage/mod.rssrc/storage/object_storage.rs
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…erable list_dirs_relative only surfaces child directories on every backend (S3/GCS/Azure via list-with-delimiter's common_prefixes, LocalFS via read_dir + is_dir), never leaf objects. A tombstone stored as a bare key named after the stream was therefore invisible to any future scan that needs to discover tombstoned streams rather than check one known name at a time. Move the marker one level deeper, under a directory named after the stream, and add list_tombstoned_streams for that scan.
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Inline comments:
In `@src/storage/object_storage.rs`:
- Around line 1498-1505: Update list_tombstoned_streams to return only stream
names whose exact .tombstone marker is confirmed, reusing is_tombstoned for each
candidate or an equivalent exact-marker listing operation. Preserve the existing
tenant and directory-listing behavior, and add a regression test covering a
marker-less directory that must not be returned.
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src/storage/mod.rssrc/storage/object_storage.rs
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…discovery set_metadata replaced the whole LogStreamMetadata wholesale, so a reload racing a delete (e.g. a schema update landing after mark_deleting()) could silently clear the deleting flag back to false despite it being documented as monotonic. Now ORs it in instead of overwriting. list_tombstoned_streams trusted list_dirs_relative's raw directory listing as proof of a marker's existence, but a directory can exist under the tombstone root without the marker itself (e.g. an interrupted write). Each candidate is now re-verified with is_tombstoned before being reported. list_old_streams (unused elsewhere in this codebase, but kept consistent with list_streams) didn't exclude TOMBSTONE_ROOT_DIRECTORY, so dir_with_old_stream would treat it as a corrupt stream directory the same way list_streams did before the earlier fix.
check_or_load_stream's resident-stream fast path doesn't itself check is_tombstoned (flagged in CodeRabbit's review of parseablehq#1768), so a concurrent request on the same node could slip through in the window between the tombstone becoming durable and mark_deleting() actually running. Moving mark_deleting() before the tombstone write, with no await point in between, closes that window entirely for the initiating node. Cross-node propagation is still bounded by the existing fan-out push and self-heal, not synchronous -- that's an accepted, already-documented limitation of this design, not something this reorder attempts to fix.
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Thanks for the review — went through all 5 findings against the actual code. Pushed a fix for 4 of them (commit 094389a on this branch); one I'm leaving as a documented, accepted limitation. Fixed:
Left as-is, with reasoning: |
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@parmesant cam you review this scaffolding, the actual change is in #1770 which I am still testing, and probably need your help too! |
Sure! Give me till tomorrow to get back on this. |
thanks @parmesant ! |
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How the tombstone-based deletion works The core problem: today, The fix, in three parts:
Cross-node correctness (this is a distributed system, not a single process):
Split into two PRs:
Happy to expand on any specific part (crash-recovery ordering, ingestor self-heal timing, why 202 vs 200, etc.) if useful. |
…ion-safety-net # Conflicts: # src/handlers/http/query.rs
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Summary
First of two PRs toward fixing #1763 (deletion of large datasets takes a while). This PR only lays the safety-net groundwork so a later PR can make stream deletion asynchronous without races. It does not change the behavior of the current delete handlers, since nothing here actually starts writing a tombstone or setting the
deletingflag yet.TOMBSTONE_ROOT_DIRECTORY(.tombstones) plustombstone_path/is_tombstonedhelpers in the storage layer. The tombstone lives outside the{tenant}/{stream}prefix that a bulk stream delete walks, so a mid-deletion crash can't lose the marker.LogStreamMetadata.deleting(transient, in-memory only) andStream::mark_deleting/is_deleting.create_stream_and_schema_from_storage, so a concurrent lazy reload can't resurrect a stream that's mid-deletion.is_deleting()check increate_streams_for_distributedand in thelogstreaminfo/schema/stats endpoints, so an already-resident stream flaggeddeletingis rejected instead of served.PostError::StreamBeingDeleted-> 409 Conflict, checked invalidate_stream_for_ingestion..tombstonesadded to bothlist_streams()implementations' directory-exclusion filters.The actual behavior change (tombstone-then-background-delete rewrite of the delete handlers, restart recovery, ingestor self-heal) is scoped as a follow-up PR once this lands, since it needs live-cluster validation that this additive piece doesn't.
Test plan
cargo build --libcargo test --lib(442 passed, 1 pre-existing ignore, 0 failed)cargo fmt --checkcargo clippy --lib --all-targets(no new warnings; all 10 pre-existing warnings are confined tosrc/event/format/known_schema.rs)is_tombstoned/tombstone_pathagainst a realLocalFSbackend,Stream::mark_deleting/is_deletingSummary by CodeRabbit