Use a small table in PutWithExistingIdNoInfiniteLoopWhenFull

[rkennke]

What does this PR do?:

Makes CallTraceStorageTest.PutWithExistingIdNoInfiniteLoopWhenFull seed a 1024-slot table (through the existing CallTraceHashTableTestAccessor) instead of filling the default 65536-slot one. It also checks that inserts beyond the capacity were dropped, i.e. that the full-table path the test is about actually ran.

Motivation:

The test filled 65536 slots, then made 128 more inserts, each probing the whole table before giving up. Under TSan that takes close to the test's fixed 10 s deadline, and it failed intermittently on CI:

• gtest-tsan-arm64 on Never reclaim dictionary storage after a timed-out drain #839 (31ab198);
• gtest-tsan-amd64 on Close guard-scan and reused-buffer gaps in dictionary reclamation #845 (7c24b1c).

Both times it was the only failing test, with no TSan reports, and the same code passed in other pipelines.

The regression it guards, a probe that cycles forever once the table is full, does not depend on the table size. putWithExistingId() never expands a table, so a small seeded table fills up and takes the same hasNext() give-up path.

Additional Notes:

The 10 s deadline stays as the hang detector. The test-only accessor moves above this test so that it is defined before its first use; its content is unchanged.

How to test the change?:

gtestDebug_test_callTraceStorage, gtestAsan_test_callTraceStorage, gtestTsan_test_callTraceStorage: the test now runs in ~52-61 ms in each configuration (previously close to 10 s under TSan).

For Datadog employees:

• If this PR touches code that signs or publishes builds or packages, or handles
  credentials of any kind, I've requested a security review (run the dd:platform-security-review
  skill, or file a request via the PSEC review form).
  bewaire also runs automatically on every PR.
• This PR doesn't touch any of that.
• JIRA: [PROF-XXXX]

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[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-09T07:10:17.223850Z	552c5f5	PR opened

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[datadog-datadog-prod-us1]

More details

The 1,024-slot table preserves the full-table probe exhaustion scenario, and the added dropped-insert assertion verifies that the overflow path is exercised.

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[dd-octo-sts]

CI Test Results

Run: #37897230469 | Commit: c5039de | Duration: 17m 25s (longest job)

✅ All 32 test jobs passed

Status Overview

JDK	glibc-aarch64/debug	glibc-amd64/debug	musl-aarch64/debug	musl-amd64/debug
8	-	✅	-	-
8-ibm	-	✅	-	-
8-j9	✅	✅	-	-
8-librca	-	-	✅	✅
8-orcl	-	✅	-	-
11	-	✅	-	-
11-j9	✅	✅	-	-
11-librca	-	-	✅	✅
17	✅	✅	-	-
17-graal	✅	✅	-	-
17-j9	✅	✅	-	-
17-librca	-	-	✅	✅
21	✅	✅	-	-
21-graal	✅	✅	-	-
21-librca	-	-	✅	✅
25	✅	✅	-	-
25-graal	✅	✅	-	-
25-librca	-	-	✅	✅

Legend: ✅ passed | ❌ failed | ⚪ skipped | 🚫 cancelled

Summary: Total: 32 | Passed: 32 | Failed: 0

---

Updated: 2026-10-09 07:27:05 UTC

[dd-octo-sts]

✅ All 40 integration tests passed

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