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Daniel Rammer
4a04584ce0
Two fixes to the Java MemWAL LSM surface, both reproduced against the
scripted test server before being fixed.
Transport retries. `HttpClients.createDefault()` installs Apache's default
response retry strategy, whose retryable-status list is exactly 429 and 503
— the two statuses `LanceDbTableLsm.isRetryable` owns. Every explicit retry
budget in `checkpointLsm` was therefore doubled on the wire (a 429 held
against flush issued 18 requests, not 9), and `compactLsm` was retried in
place despite the loop being built to fall through to a fresh stats poll.
Automatic retries are now disabled, so the checkpoint loop is the sole owner
of the 421/429/503 transitions.
Stats decoding. `getLsmStats` read the response with Jackson's `path()`,
which yields a missing node that iterates as an empty array. That made
"malformed" indistinguishable from "no buckets", which is indistinguishable
from "drained" — so an empty response body, a `{"lsm_stats": {}}`, or a
bucket missing its required fields all made `checkpointLsm()` report
convergence for a checkpoint that never ran.
Stats now decode into `LsmStats`, `BucketStats`, `GenerationStats` and
`MemtableStats`, mirroring the Rust structs in
`rust/lancedb/src/table/lsm_stats.rs` and the objects the Node binding
already exposes. Decoding is strict and fails closed, matching the serde
contract on the Rust side: absent or null `lsm_stats` means the LSM write
path is off, and anything else present must decode into the full
bucket/generation shape. `newestGeneration` and `outstandingGenerations`
move onto `BucketStats`, matching Rust's `impl BucketStats`.
This changes `getLsmStats` from `Optional<JsonNode>` to `Optional<LsmStats>`,
which also brings Java to the typed surface Node already had rather than
handing back a raw JSON blob.
Testing: 33 passing in lancedb-core, up from 29. The new tests pin the wire
request count against the retry budget and reject five malformed stats
payloads. `testCheckpointRetriesRetryableStatusInPlace` previously passed on
a transport-absorbed 429 and now exercises the real retry path.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The Multimodal AI Lakehouse
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The ultimate multimodal data platform for AI/ML applications.
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