fix(sdk): add max_spans limit to InMemorySpanExporter#5296
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xrmx merged 7 commits intoJul 10, 2026
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…SpanExporter - Update InMemorySpanExporter type hint from typing.Optional[int] to int | None. - Refactor test_max_spans_limit to test distinct spans and assert order.
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Description
InMemorySpanExportercurrently stores all spans in an unbounded list,which can cause memory issues in long-running test environments or
production debug scenarios.
This PR adds an optional
max_spansparameter to__init__. When set,the internal storage uses
collections.deque(maxlen=max_spans)whichautomatically drops the oldest spans when the limit is reached. Default
is
None(no limit), so existing behaviour is fully preserved.Fixes #5281
Type of change
How Has This Been Tested?
Ran the existing test suite plus two new tests via tox:
tox -e py312-test-opentelemetry-sdk -- tests/trace/export/test_in_memory_span_exporter.py
test_max_spans_limit— verifies oldest spans are dropped when limit is reachedtest_max_spans_none_is_unlimited— verifies default behaviour is unchanged