Add tests for write table concurrency

rerun_py/tests/e2e_redap_tests/conftest.py

@@ -31,7 +31,7 @@
 )
 
 
-@pytest.fixture(scope="module")
+@pytest.fixture(scope="function")
 def table_filepath() -> Generator[pathlib.Path, None, None]:
     """
     Copies test data to a temp directory.

rerun_py/tests/e2e_redap_tests/test_table_write.py

@@ -1,8 +1,10 @@
 from __future__ import annotations
 
+import threading
 from typing import TYPE_CHECKING
 
 import pyarrow as pa
+import pytest
 from datafusion import DataFrameWriteOptions, InsertOp, SessionContext, col
 from rerun.catalog import TableInsertMode
 
@@ -90,3 +92,59 @@ def test_client_append_to_table(server_instance: ServerInstance) -> None:
         table_name, id=[3, 4, 5], bool_col=[False, True, None], double_col=[2.0, None, 1.0]
     )
     assert ctx.table(table_name).count() == original_rows + 4
+
+
+@pytest.mark.parameterize("is_append", [True, False])
+def test_concurrent_write_tables(server_instance: ServerInstance, is_append: bool) -> None:
+    num_writes = 100
+
+    table_name = "simple_datatypes"
+    ctx: SessionContext = server_instance.client.ctx
+
+    df_prior = ctx.table(table_name)
+    prior_count = df_prior.count()
+
+    df_low = ctx.table(table_name).filter(col("id") < 3).cache()
+    low_count = df_low.count()
+
+    df_high = ctx.table(table_name).filter(col("id") >= 3).cache()
+    high_count = df_high.count()
+
+    # Track any exceptions from threads
+    exceptions = []
+
+    def write_low() -> None:
+        for _ in range(num_writes):
+            try:
+                df_low.write_table(table_name)
+            except Exception as e:
+                exceptions.append(e)
+                return
+
+    def write_high() -> None:
+        for _ in range(num_writes):
+            try:
+                df_high.write_table(table_name)
+            except Exception as e:
+                exceptions.append(e)
+                return
+
+    thread1 = threading.Thread(target=write_low)
+    thread2 = threading.Thread(target=write_high)
+
+    thread1.start()
+    thread2.start()
+
+    thread1.join()
+    thread2.join()
+
+    if exceptions:
+        raise exceptions[0]
+
+    final_count = ctx.table(table_name).count()
+
+    expected = (
+        [prior_count + (num_writes * low_count) + (num_writes * high_count)] if is_append else [low_count, high_count]
+    )
+
+    assert final_count in [low_count, high_count], f"Expected rows in {expected} rows, got {final_count}"