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dbde85b68d
Fixes flaky omnigraph-server integration suite under parallel cargo
test. Lance defaults to a 100 MB FairSpillPool per Omnigraph instance
(lance-datafusion/src/exec.rs:316). That's fine in prod (one server
process, bounded concurrent sorts) but too small when cargo test
spawns many Omnigraph instances in parallel, each running concurrent
BTree index builds during load.
Failure signature:
Lance("create BTree index on node:Person(id): ... LanceError(IO):
Not enough memory to continue external sort. ... 0.0 B remain
available for the total pool")
Before: 10/41 OOM-fail on parallel run; passed with --test-threads=1.
After: 41/41 pass in parallel in ~3s.
[env] in .cargo/config.toml applies to cargo-launched processes only.
Shipped binaries (release tarballs, Docker images) are unaffected —
they inherit whatever the runtime env provides, defaulting to Lance's
100 MB when unset.
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