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storage/tests: Adjust step size deviation used in test #18420

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May 13, 2024
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storage/tests: Adjust step size deviation used in test #18420

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1 change: 1 addition & 0 deletions src/v/storage/segment_index.h
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Original file line number Diff line number Diff line change
Expand Up @@ -258,6 +258,7 @@ class segment_index {

friend class offset_index_utils_fixture;
friend class log_replayer_fixture;
friend class segment_index_observer;

friend std::ostream& operator<<(std::ostream&, const segment_index&);
};
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51 changes: 42 additions & 9 deletions src/v/storage/tests/storage_e2e_test.cc
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Expand Up @@ -4555,6 +4555,26 @@ FIXTURE_TEST(test_offset_range_size2_compacted, storage_test_fixture) {
== std::nullopt);
};

namespace storage {
class segment_index_observer {
public:
explicit segment_index_observer(segment_index& index)
: _index{index} {}

size_t max_step_size() const {
fragmented_vector<size_t> diffs;
auto& pos = _index._state.position_index;
diffs.reserve(pos.size());
std::adjacent_difference(
pos.begin(), pos.end(), std::back_inserter(diffs));
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didn't know about adjacent_difference, cool

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Unfortunately it does not work on const references to containers, but handy where usable.

return std::ranges::max(diffs);
}

private:
segment_index& _index;
};
} // namespace storage

FIXTURE_TEST(test_offset_range_size_incremental, storage_test_fixture) {
#ifdef NDEBUG
size_t num_segments = 300;
Expand All @@ -4575,15 +4595,14 @@ FIXTURE_TEST(test_offset_range_size_incremental, storage_test_fixture) {
size_t max_size;
};
std::vector<size_target> size_classes = {
// can overshoot quite a lot because of the index step (32KiB)
{100, 0, 50_KiB},
{2000, 1_KiB, 50_KiB},
{10_KiB, 1_KiB, 50_KiB},
{50_KiB, 1_KiB, 100_KiB},
{500_KiB, 1_KiB, 550_KiB},
{1_MiB, 1_KiB, 1_MiB + 50_KiB},
{10_MiB, 1_KiB, 10_MiB + 50_KiB},
{100_MiB, 1_KiB, 100_MiB + 50_KiB},
{100, 0, 100},
{2000, 1_KiB, 2000},
{10_KiB, 1_KiB, 10_KiB},
{50_KiB, 1_KiB, 50_KiB},
{500_KiB, 1_KiB, 500_KiB},
{1_MiB, 1_KiB, 1_MiB},
{10_MiB, 1_KiB, 10_MiB},
{100_MiB, 1_KiB, 100_MiB},
};
auto cfg = default_log_config(test_dir);
ss::abort_source as;
Expand All @@ -4608,6 +4627,7 @@ FIXTURE_TEST(test_offset_range_size_incremental, storage_test_fixture) {
}
log->force_roll(ss::default_priority_class()).get();
}
size_t max_step_size = 0;
for (auto& s : log->segments()) {
if (s->size_bytes() == 0) {
continue;
Expand All @@ -4618,6 +4638,19 @@ FIXTURE_TEST(test_offset_range_size_incremental, storage_test_fixture) {
s->index().path(),
s->index().size());
BOOST_REQUIRE(s->index().size() > 0);
max_step_size = std::max(
max_step_size,
storage::segment_index_observer{s->index()}.max_step_size());
}

BOOST_REQUIRE(max_step_size > 0);
vlog(
e2e_test_log.info,
"Max index step size among all segments: {}",
max_step_size);

for (auto& sc : size_classes) {
sc.max_size += max_step_size + sc.target;
}

std::vector<batch_summary> summaries;
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