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test: bump multishard_query_test querier_cache TTL to 60s to avoid flake

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Three test cases in multishard_query_test.cc set the querier_cache entry
TTL to 2s and then assert, between pages of a stateful paged query, that
cached queriers are still present (population >= 1) and that
time_based_evictions stays 0.

The 2s TTL is not load-bearing for what these tests exercise — they are
checking the paging-cache handoff, not TTL semantics. But on busy CI
runners (SCYLLADB-1642 was observed on aarch64 release), scheduling
jitter between saving a reader and sampling the population can exceed
2s. When that happens, the TTL fires, both saved queriers are
time-evicted, population drops to 0, and the assertion
`require_greater_equal(saved_readers, 1u)` fails. The trailing
`require_equal(time_based_evictions, 0)` check never runs because the
earlier assertion has already aborted the iteration — which is why the
Jenkins failure surfaces only as a bare "C++ failure at seastar_test.cc:93".

Reproduced deterministically in test_read_with_partition_row_limits by
injecting a `seastar::sleep(2500ms)` between the save and the sample:
the hook then reports
  population=0 inserts=2 drops=0 time_based_evictions=2 resource_based_evictions=0
and the assertion fires — matching the Jenkins symptoms exactly.

Bump the TTL to 60s in all three affected tests:

  - test_read_with_partition_row_limits (confirmed repro for SCYLLADB-1642)
  - test_read_all                       (same pattern, same invariants — suspect)
  - test_read_all_multi_range           (same pattern, same invariants — suspect)

Leave test_abandoned_read (1s TTL, actually tests TTL-driven eviction)
and test_evict_a_shard_reader_on_each_page (tests manual eviction via
evict_one(); its TTL is not load-bearing but the fix is deferred for a
separate review) unchanged.

Fixes: SCYLLADB-1683

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Closes scylladb/scylladb#29564

(cherry picked from commit f5eb99f149)

Closes scylladb/scylladb#29607
This commit is contained in:
Avi Kivity
2026-04-20 15:45:24 +03:00
committed by Botond Dénes
parent 4e80e3e224
commit c758e3d97a
1 changed files with 3 additions and 3 deletions
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6
test/boost/multishard_query_test.cc
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@@ -548,7 +548,7 @@ SEASTAR_THREAD_TEST_CASE(test_read_all) {
using namespace std::chrono_literals;
env.db().invoke_on_all([] (replica::database& db) {
db.set_querier_cache_entry_ttl(2s);
db.set_querier_cache_entry_ttl(60s);
}).get();
const auto ks = create_vnodes_keyspace(env);
@@ -605,7 +605,7 @@ SEASTAR_THREAD_TEST_CASE(test_read_all_multi_range) {
using namespace std::chrono_literals;
env.db().invoke_on_all([] (replica::database& db) {
db.set_querier_cache_entry_ttl(2s);
db.set_querier_cache_entry_ttl(60s);
}).get();
const auto ks = create_vnodes_keyspace(env);
@@ -667,7 +667,7 @@ SEASTAR_THREAD_TEST_CASE(test_read_with_partition_row_limits) {
using namespace std::chrono_literals;
env.db().invoke_on_all([] (replica::database& db) {
db.set_querier_cache_entry_ttl(2s);
db.set_querier_cache_entry_ttl(60s);
}).get();
const auto ks = create_vnodes_keyspace(env);