Integration tests performance degradation

[kevinjqliu]

Apache Iceberg version

main (development)

Please describe the bug 🐞

Integration tests feel significantly slower than before.

make test-integration

Running on the latest main branch took 266 seconds, which is more than 4 minutes

/usr/bin/time make test-integration

=============================================================== 765 passed, 4 skipped, 2415 deselected, 24 warnings in 217.18s (0:03:37) ================================================================
      265.95 real        17.03 user         7.11 sys

Compare this to pyiceberg-0.6.0rc6 tag, integration tests only took 100 seconds.

git checkout pyiceberg-0.6.0rc6
/usr/bin/time make test-integration

============================================================== 508 passed, 4 skipped, 2305 deselected in 48.61s ==============================================================
       99.89 real         9.43 user         4.16 sys

Here are the top 10 slowest tests:

PYTEST_ARGS="--durations=10" make test-integration

============================================================================ slowest 10 durations ============================================================================
5.93s call     tests/integration/test_add_files.py::test_add_files_to_unpartitioned_table[1]
3.52s call     tests/integration/test_reads.py::test_ray_nan[catalog_hive]
3.12s setup    tests/integration/test_add_files.py::test_add_files_to_unpartitioned_table[1]
2.66s call     tests/integration/test_writes/test_partitioned_writes.py::test_query_filter_null_partitioned[1-int]
2.62s call     tests/integration/test_writes/test_partitioned_writes.py::test_query_filter_v1_v2_append_null[int]
2.46s call     tests/integration/test_writes/test_partitioned_writes.py::test_query_filter_appended_null_partitioned[2-binary]
2.35s call     tests/integration/test_writes/test_partitioned_writes.py::test_query_filter_null_partitioned[1-float]
2.26s call     tests/integration/test_writes/test_partitioned_writes.py::test_query_filter_v1_v2_append_null[bool]
2.21s call     tests/integration/test_writes/test_partitioned_writes.py::test_query_filter_null_partitioned[1-long]
2.21s call     tests/integration/test_reads.py::test_table_properties_dict[catalog_hive]

[kevinjqliu]

Some potential optimizations:

• parallelize pytest execution, this requires that each test can be independently run
• un-paratermized some tests, I noticed that tests like test_query_filter_only_nulls are parameterized by many args making the number of tests equal to the args multiplied together.

[Gowthami03B]

Interesting, @kevinjqliu are you already working on this?

[kevinjqliu]

Yeah, I started looking at ways to optimize all the tests. I'm blocked on making tests run in isolation. There's a wip PR #598

[kevinjqliu]

Here's what I'm blocked on specifically.

Parallelize this test test_query_filter_appended_null,

PYTEST_ARGS="-n auto -k test_query_filter_appended_null" /usr/bin/time make test-integration

The problem is the table default.arrow_table_v1_with_null used has scope="session", autouse=True, which because of the session scope, can't run in parallel

[Fokko]

I would love to check where the time is being spent.

Concerning parallelization, I'm a bit hesitant since I think this will also apply more pressure on the rest catalog. I'm doubtful if it will really speed up the tests, but the numbers will tell.

[kevinjqliu]

Making all the tests run in parallel requires lots and lots of changes.

For the short term, the best way forward is to look at individual tests. pytest's --duration shows parameterized tests as separate tests. I wrote a script to roll up the parameterized tests

Here are the top 10 tests by duration, group by test name for parameterized tests

tests/integration/test_writes/test_partitioned_writes.py:test_query_filter_appended_null_partitioned, 22 tests, took 47.68
tests/integration/test_writes/test_partitioned_writes.py:test_query_filter_null_partitioned, 22 tests, took 39.73
tests/integration/test_writes/test_partitioned_writes.py:test_query_filter_only_nulls_partitioned, 22 tests, took 29.37
tests/integration/test_writes/test_partitioned_writes.py:test_query_filter_v1_v2_append_null, 11 tests, took 22.38
tests/integration/test_writes/test_partitioned_writes.py:test_query_filter_without_data_partitioned, 22 tests, took 17.06
tests/integration/test_add_files.py:test_add_files_to_unpartitioned_table, 3 tests, took 13.00
tests/integration/test_partitioning_key.py:test_partition_key, 28 tests, took 6.25
tests/integration/test_rest_schema.py:test_disallowed_updates, 337 tests, took 5.88
tests/integration/test_reads.py:test_ray_nan, 2 tests, took 3.88
tests/integration/test_writes/test_writes.py:test_query_filter_appended_null, 24 tests, took 3.66

Top 5 tests are all from test_partitioned_writes.py, totaling 156.22 seconds (2.6 minutes). These tests are heavily parameterized

@pytest.mark.parametrize(
    "part_col", ['int', 'bool', 'string', "string_long", "long", "float", "double", "date", "timestamptz", "timestamp", "binary"]
)

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