Flaky test: QueryVirtualStorageTest.testQueryTooMuchData #20550

This issue was generated automatically by Claude Code (Anthropic's AI coding agent) running a scheduled CI-triage routine on behalf of @FrankChen021. Analysis and suggested fixes are AI-produced; please verify before acting on them.

Status: Resolved by #20552
Subject: QueryVirtualStorageTest.testQueryTooMuchData (embedded-tests, unit tests (25, N*,Q*))
Failures: 2 · First seen: 2026-10-08 · Last seen: 2026-10-10

Root cause

The query fails as intended, but the assertion at QueryVirtualStorageTest.java:166 requires the exact message Unable to reserve bundle. With a 1 MiB cache and virtualStorageLoadThreads set to the CPU count, which reservation runs out of space first depends on thread timing. PartialSegmentMetadataCacheEntry throws Unable to reserve bundle[...], SegmentLocalCacheManager.reservePartial throws Unable to reserve partial metadata for segment[...], and the full-load path throws Unable to load segment[...] on demand. All three are CAPACITY_EXCEEDED, but only the first one passes the test. The failing commit (#20508) changes only Dart worker discovery, and the job passed on the neighbouring master commits.

Suggested fix

Assert on what all three capacity errors share: the CAPACITY_EXCEEDED category, or the substring ensure enough disk space has been allocated. Don't match the bundle-specific message, and include t.getMessage() in the assertion message so a future mismatch shows the actual error.

Merged fix: #20552 (2026-10-11).

Occurrences

Failed push-triggered master jobs only. The daily triage routine adds one row per new failed job.